JP2002149196A - Signal transmission device and signal transmission method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To transmit speech coded information having different sampling frequencies at the same repetition time. SOLUTION: In the signal transmission device of the present invention, when the audio coded information has a sampling frequency of ×× F, the data generation unit outputs one of the audio coded information.
A set of blocks including a previous block and a subsequent block is generated for data of a frame, and data of one frame of the audio coding information is stored in a body part of the generated previous block, Management information including information indicating that data stored in the body part is invalid is stored in a header part of the generated block, and the audio encoding information is a sampling frequency of 1/2 ×
The size of each of the preceding block and the subsequent block generated when the audio coding information has the sampling frequency F is the size of one block generated when the audio coding information has the sampling frequency F. Equal to

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device and a signal transmission method for transmitting encoded audio information. More specifically, a plurality of sampling frequencies F or 1 / N
The present invention relates to a signal transmission device and a signal transmission method for transmitting a plurality of pieces of audio coded information having × F and encoded by the same encoding method to a signal reception device via a digital interface.

[0002]

2. Description of the Related Art Speech coded information is transmitted from a signal transmitting device to a signal receiving device via a digital interface.

FIG. 7 shows a conventional audio data processing apparatus 700.
It is a schematic diagram for demonstrating. Audio data processing device 7
Reference numeral 00 includes a signal transmission device 701 that transmits a transmission signal 704 including audio encoded information, a digital interface 702 that mediates the transmission signal 704, and a signal reception device 703 that receives the transmission signal 704. Signal receiving device 7
03 is a device that reproduces the transmission signal 704, for example.

As described above, the digital interface 70
ISO / IEC 61937 is known as a standard for transmitting and receiving audio coded information over the Internet. According to this standard, a signal transmitting apparatus 701 uses PCM (Pulse Code M: Pulse Code Modulation) of M samples per frame.
The transmission signal 704 including the audio coding information obtained by coding the modulation (transmission) is transmitted in the form of a 16-bit M-sample stereo signal. At this time, if the size of the burst information including the management information and the audio coding information is less than the block size of 16 × M × 2 bits, the signal transmitting device 7
01 performs stuffing processing on an area less than the area, writes stuffing information, sets all the area to 0, and generates a block.

Generally, in a transmission signal 704 transmitted from the signal transmission device 701, synchronization word information appears for each block. In this specification, the time from the start of a block indicated by one piece of synchronous word information to the start of another block indicated by the next piece of synchronous word information is called a repetition time.

[0006] In this standard ISO / IEC61397, LSF (Low Sampling Frequency: Low Sampling Frequency) of MPEG2 audio is used.
y) stream (24 kHz, 22.05 kHz, 1
6 kHz). The repetition time in this case is 48 kHz sampling frequency, 44.1 k
Hz and 32 kHz, which is twice as long as the repetition time for transmitting an MPEG1 audio stream.

A general digital interface 70 as described in the standard ISO / IEC61397
The transmission clock of No. 2 has a sampling frequency of 48 kHz, 44.1 kHz, and
The case of 32 kHz is assumed.

[0008] In the case where the coding method of the audio coding information is different as described above, in order for the signal receiving apparatus 703 to correctly receive the transmission signal 704, the signal receiving apparatus 703 needs to receive information on the coding method. is necessary. According to this standard, a value indicating that the coding method of the audio coding information is different is defined in the bit field of the data type information of the transmission signal 704, and the signal receiving apparatus 703 is notified that the coding method is different.

In this case, the repetition time of the transmission signal 704 changes together with the coding method of the voice coding information.
If the coding method of the voice coding information is defined by the data type information, the signal receiving device 703 can correctly synchronize the transmission signal 704. Therefore, the signal receiving device 7
03 can appropriately process the transmission signal 704.

[0010]

Here, a case is considered where audio encoded information having the same encoding scheme but different sampling frequencies is transmitted to the signal receiving apparatus 703 via the digital interface 702. The transmission clock of the digital interface 702 and the reception clock of the signal receiving device 703 are constant, and it is assumed that the sampling frequency of the voice coded information is 48 kHz.

Generally, the digital interface 702
Is equal to the reception clock of the signal receiving device 703. In the following description, it is assumed that the transmission clock of the digital interface 702 is equal to the reception clock of the signal receiving device 703.

In the prior art, the signal receiving device 703 is
Unless the change of the repetition time of the transmission signal is notified, it is not possible to appropriately receive the speech coded information having a sampling frequency other than the assumed sampling frequency.

For example, when transmitting audio encoded information having a certain sampling frequency and then transmitting audio encoded information having a different sampling frequency, the transmission signal 7
The change in the repetition time of the signal reception device 70
3, the signal receiving device 703 transmits the transmission signal 7.
04 cannot be received correctly.

Hereinafter, a conventional example will be specifically described.

FIG. 8 shows a structure of a conventional transmission frame including speech coding information. The transmission frame is the transmission signal 704
And a continuous transmission frame is a signal transmission device 7
01 is output as a transmission signal 704.

FIG. 8A shows the structure of a transmission frame 800 including speech coded information 803. Audio coding information 8
Reference numeral 03 denotes one frame of data obtained by dividing audio encoded information having a sampling frequency of 48 kHz in frame units. FIG. 8B shows the structure of a transmission frame 850 including the audio coding information 853.
The audio coding information 853 has a sampling frequency of 24 kHz.
This is one-frame data obtained by dividing audio encoded information having z in units of frames. Here, the coding method of the audio coded information having the sampling frequency of 48 kHz and the audio coded information having the sampling frequency of 24 kHz are the same. That is, the encoding method of the audio encoded information 803 is the same as the encoding method of the audio encoded information 853.

As shown in FIG. 8A, a transmission frame 800 is composed of one block. Transmission frame 8
00 includes a header 801 and a body 802. Management information 811 is stored in the header 801. Data information 812 is stored in body portion 802. The management information 811 includes synchronization word information 821 and side information 822. Data information 812 is speech encoded information 8
03 is included. The data information 812 is the non-speech coded information 82
3 may be included.

The signal transmitting apparatus 701 shown in FIG.
0, and outputs a transmission signal 704 including a continuous transmission frame 800 to the digital interface 702.

The management information 811 is information for managing data stored in the body 802. Here, the speech coded information 803 and the non-speech coded information 8 are used as data.
23 are stored. Management information 811 includes information indicating whether the data stored in body portion 802 is valid. The synchronization word information 821 indicates the start of a block of the transmission frame 800. The synchronization word information 821 is used to derive a repetition time between transmission frames 800 that are continuously transmitted. Side information 822 is information indicating whether or not voice encoded information 803 is stored in body portion 802. The non-speech coded information 823 is information indicating that speech coded information is not included. The non-speech coded information 823 is used to make the size of the data information 812 constant.

As shown in FIG. 8B, the transmission frame 850 is composed of one block. Transmission frame 8
50 includes a header part 851 and a body part 852. Management information 861 is stored in the header section 851. Data information 862 is stored in body portion 852. Management information 861 includes synchronization word information 871 and side information 872. The data information 862 is the audio encoding information 8
53. Data information 862 is non-speech coded information 87
3 may be included.

The signal transmitting apparatus 701 shown in FIG.
0, and outputs a transmission signal 704 including a continuous transmission frame 850 to the digital interface 702.

The management information 861 is information for managing data stored in the body 852. Here, the speech coded information 853 and the non-speech coded information 8 are used as data.
73 are stored. Management information 861 includes information indicating whether the data stored in body portion 850 is valid. The synchronization word information 871 indicates the start of a block of the transmission frame 850. The synchronization word information 871 is used to derive a repetition time between transmission frames 850 that are continuously transmitted. The side information 872 is information indicating whether or not the audio encoding information 853 is stored in the body 852. The non-speech coded information 873 is information indicating that speech coded information is not included. The non-speech coded information 873 is used to make the size of the data information 862 constant. The size of the body 852 is
It is twice the size of the body part 802.

As described above, the voice coded information 803 and the voice coded information 853 are both data of one frame (that is, data of the same number of samples) and data coded by the same coding method. However, the sampling frequency of the audio encoding information 803 is
Of the audio encoded information 8
03 is different from the reproduction time of the audio coding information 853. Further, the time when the transmission frame 800 including the audio coded information 803 is received by the signal receiving device 703 is different from the time when the transmission frame 850 including the audio coded information 853 is received by the signal receiving device 703.

In the case of the above example, the time required to receive the transmission frame 850 is twice the time required to receive the transmission frame 800, and
3 is required to be reproduced by the audio encoding information 803.
Is twice as long as the time required to reproduce. Further, the repetition time of the transmission signal including the transmission frame 850 is twice the repetition time of the transmission signal including the transmission frame 800.

As described with reference to FIG. 8, when the sampling frequency of one piece of speech coded information is half the sampling frequency of the other piece of speech coded information, one piece of speech coded information is transmitted. The repetition time of the transmission signal to be transmitted is twice the repetition time of the transmission signal for transmitting the other audio coding information. Similarly, when the sampling frequency of one piece of speech coded information is 1 / N times the sampling frequency of the other piece of speech coded information, the repetition time of the transmission signal for transmitting one piece of speech coded information is This is N times the repetition time of the transmission signal for transmitting the encoded information. Here, N is a natural number of 2 or more. When the sampling frequency of the audio coded information becomes 1 / N times, the size of the body part received by the signal receiving device 703 becomes N times, and as a result, the repetition time also becomes N times.

As described above, even with the same encoding method, the repetition time changes depending on the sampling frequency of the audio encoded information. If the transmission signal 704 is transmitted without notifying the signal reception device 703 that the repetition time is different, the signal reception device 703 cannot properly synchronize the transmission signal 704. Therefore, in order for the signal receiving device 703 to correctly receive the transmission signal 704, it is necessary to notify the signal receiving device 703 that at least the repetition time has changed.

Alternatively, in order to intermittently notify the signal receiving apparatus 703 of the repetition time of the transmission signal 704, information on the sampling frequency of the audio coded information is defined in the management information. Conventionally, standard ISO / IEC61397
In, when the repetition time is different even if the coding method is the same, different values are defined for the data type information. Data type information indicating information on data information is included in the management information. However, defining different data type information for each sampling frequency increases the types of data to be recorded in the data type information. As a result, the bit field of the data type information cannot be used effectively, and the bit field of the data type information runs short.

[0028]

SUMMARY OF THE INVENTION A signal transmitting apparatus according to the present invention is a signal transmitting apparatus for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving apparatus via a digital interface. Each of the plurality of pieces of audio coded information has a sampling frequency of either a sampling frequency F or a sampling frequency １ ／ × F, and the signal transmission device converts the audio coded information into frame units. A data generating unit that generates at least one block based on data of one frame obtained by dividing the data into one, and a data output unit that outputs the at least one block generated by the data generating unit to the digital interface Wherein each of the at least one block comprises:
A body part, and a header part for storing management information for managing data stored in the body part, wherein the management information includes a synchronizing word information indicating a start of a block, and the body part. And information indicating whether the stored data is valid or not. If the audio encoding information has a sampling frequency F, the data generation unit may execute one frame of the audio encoding information. Generates one block for the data of the above, stores one frame of data of the audio coding information in the body part of the generated block, and stores the data in the body part in the header part of the generated block. Management information including information indicating that the received data is valid, and when the audio coding information has a sampling frequency of 1/2 × F, The data generation unit generates a set of blocks including a previous block and a subsequent block for one frame of data of the audio coding information, and stores the audio code in a body part of the generated previous block. And storing management information including information indicating that the data stored in the body portion is valid in a header portion of the generated previous block, and storing the generated The management information including the information indicating that the data stored in the body part is invalid is stored in the header part of the block after the decoding, and the audio coding information has a sampling frequency of 1/2 × F. In this case, the size of each of the previous block and the subsequent block generated by the data generation unit is equal to the size of the previous block when the audio coding information has a sampling frequency F. Equal to the size of the one block data generating unit has generated.

The information indicating whether or not the data stored in the body portion is valid is side information indicating whether or not the speech coded information is stored in the body portion. When indicating that the speech coded information is not stored in the body part, the side information may indicate that data stored in the body part is invalid.

[0030] The data generator may store stuffing information in a body part of the subsequent block.

[0031] The management information further includes data type information indicating a coding method of data stored in the body portion, and the data type information of the preceding block is such that the audio coding information has a sampling frequency F. The data type information of the subsequent block is the same as the data type information of the block generated when the data is stored, and the data type information of the subsequent block is independent of the encoding method of the data stored in the body part of the subsequent block. May indicate an encoding method of data stored in the body part of the block.

[0032] The signal transmitting apparatus of the present invention is a signal transmitting apparatus for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving apparatus via a digital interface. Each of the encoded information has a sampling frequency of one of a sampling frequency F and a sampling frequency 1 / N × F, where N is a natural number of 2 or more, and the signal transmitting device Based on one frame of data obtained by dividing the encoded information into frame units,
A data generation unit that generates at least one block;
The at least one generated by the data generation unit
A data output unit for outputting one block to the digital interface, wherein each of the at least one block includes a body portion, and a header portion for storing management information for managing data stored in the body portion. The management information includes synchronization word information indicating the start of a block, and information indicating whether or not data stored in the body part is valid. When the data has the frequency F, the data generation unit generates one block for one frame of data of the audio coding information, and adds the audio coding data to the body of the generated block. In addition to storing data of one frame of information, the data stored in the body is valid in the header of the generated block. Stores management information including information indicating that the speech encoded information sampling frequency 1 / N
XF, the data generation unit generates a set of blocks including N blocks for one frame of data of the audio coding information, Data of one frame of the speech coded information is stored in the body part of the first block output first of the blocks, and the data stored in the body part is stored in the header part of the first block. Is stored, the data stored in the body portion is invalid in the header portion of a block other than the first block of the generated N blocks. Management information including information indicating the fact that the audio encoding information has a sampling frequency of 1 / N × F, each of the N blocks generated by the data generation unit. This size is equal to the size of one block generated by the data generation unit when the audio coding information has the sampling frequency F.

[0033] The signal transmission method of the present invention is a signal transmission method for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving apparatus via a digital interface. Each of the encoded information has a sampling frequency of either a sampling frequency F or a sampling frequency 1/2 × F, and the signal transmission method is obtained by dividing the audio encoded information into frame units. Generating at least one block based on the obtained one frame of data, and outputting the generated at least one block to the digital interface, wherein each of the at least one block includes a body. Part and a pipe for managing data stored in the body part Has a header section for storing information, the management information includes synchronization word information indicating the start of a block, and information indicating whether data stored in the body section is valid, When the audio encoding information has a sampling frequency F, the generating step generates one block for one frame of data of the audio encoding information, and generates a block of the generated block. One frame of data of the audio coding information is stored in a body part, and management information including information indicating that the data stored in the body part is valid is stored in a header part of the generated block. And if the audio coded information has a sampling frequency of 1/2 × F, the generating step includes one frame of the audio coded information. Generating a set of blocks including a previous block and a subsequent block for the data of the program, storing data of one frame of the audio coding information in a body part of the generated previous block, In the header part of the generated previous block, management information including information indicating that the data stored in the body part is valid is stored, and the header part of the generated block is stored in the body part. Storing the management information including information indicating that the stored data is invalid, wherein the speech encoding information generated when the speech encoding information has a sampling frequency of 1/2 × F. The size of each of the block and the subsequent block is equal to the size of one block generated when the audio coding information has the sampling frequency F.

The information indicating whether or not the data stored in the body portion is valid is side information indicating whether or not the speech coded information is stored in the body portion. When indicating that the speech coded information is not stored in the body part, the side information may indicate that data stored in the body part is invalid.

[0035] In the generating step, stuffing information may be stored in a body part of the subsequent block.

[0036] The management information further includes data type information indicating an encoding method of data stored in the body part, and the data type information of the preceding block is such that the audio encoding information has a sampling frequency F. The data type information of the subsequent block is the same as the data type information of the block generated when the data is stored, and the data type information of the subsequent block is independent of the encoding method of the data stored in the body part of the subsequent block. May indicate an encoding method of data stored in the body part of the block.

The signal transmission method according to the present invention is a signal transmission method for transmitting a plurality of pieces of audio coded information encoded by the same encoding method to a signal receiving device via a digital interface. Each of the coded information has a sampling frequency of one of a sampling frequency F and a sampling frequency 1 / N × F, where N is a natural number of 2 or more, and the signal transmission method includes: Based on one frame of data obtained by dividing the encoded information into frame units,
Generating at least one block; and outputting the generated at least one block to the digital interface, wherein each of the at least one block includes a body part;
A header section for storing management information for managing data stored in the body section, wherein the management information includes synchronization word information indicating a start of a block, and data stored in the body section. And information indicating whether or not is valid, and when the audio encoding information has a sampling frequency F, the generating step is performed on the data of one frame of the audio encoding information. To generate one block, store the data of one frame of the audio coding information in the body part of the generated block, and store the data stored in the body part in the header part of the generated block. Storing the management information including information indicating that it is valid, and if the audio coding information has a sampling frequency of 1 / N × F, The generating step generates a set of blocks including N blocks for one frame of data of the audio coding information, and outputs a set of blocks that is output at the beginning of the generated N blocks. A management unit that stores data of one frame of the audio coded information in a body part of one block and includes information indicating that the data stored in the body part is valid in a header part of the first block; Storing information and generating the generated N
Storing management information including information indicating that data stored in the body portion is invalid in a header portion of a block other than the first block of the plurality of blocks, wherein the speech encoding information Has a sampling frequency 1 / N × F, the size of each of the N blocks generated when the audio coding information has a sampling frequency F is 1 Equal to the size of one block.

As described above, according to the present invention, even if the sampling frequency of the audio coding information is different, a plurality of blocks having the same size are continuously transmitted, so that the transmission signal can be transmitted without changing the repetition time. Can be sent.

More specifically, when the sampling frequency of one piece of speech coded information is 倍 times the sampling frequency of the other piece of speech coded information, one frame of data of one piece of speech coded information is used. Then, two blocks having the same size as the block when transmitting the data of one frame of the other audio coding information are generated, and the generated two blocks are continuously transmitted. Since each of the two transmitted blocks stores the synchronizing word information indicating the start of the block, the repetition time of the transmission signal is constant regardless of the sampling frequency of the audio coding information. Therefore, there is no need to notify the signal receiving device of the repetition time. As a result, it is possible to define the same data type information of a transmission signal for transmitting audio coding information having different sampling frequencies.

According to the present invention, the management information stored in the header of the block generated by the data generator includes information indicating whether the data stored in the body of the block is valid. Including. Accordingly, the signal receiving apparatus that receives this block searches the header portion for information indicating whether the data stored in the body portion of the block is valid, and searches for the data stored in the body portion of the block. Is valid or not.

According to the present invention, when the audio coded information has a sampling frequency of 1/2 × F, the data of one frame of the audio coded information is stored in the body of the previous block, and Information indicating that the data stored in the body of the previous block is valid is stored in the header of the block, and the header of the subsequent block is stored in the body of the subsequent block. Information indicating that the data is invalid is stored. Therefore, the signal receiving apparatus can extract the audio coding information by extracting only the body part of the previous block. In this case, it is possible to always set the delay time of the signal receiving device to the same time.

Also, the header part of the subsequent block stores information indicating that no audio coding information is stored in the body part of the subsequent block. Therefore, the signal receiving apparatus stores the information in the body part of the subsequent block. There is no need to extract stored data. At this time, the stuffing information may be stored in the body part of the subsequent block.

Further, when the payload length information stored in the header part of the subsequent block indicates that the payload length of the body part of the subsequent block is less than the minimum value (for example, 0), the signal receiving apparatus There is no need to extract the body part of the subsequent block. The signal receiving apparatus can receive the entire data of one frame of the audio encoded information only by extracting only the body part of the previous block including the audio encoded information.

In the above description, the case where the sampling frequency of one piece of speech coded information is 1/2 times the sampling frequency of the other piece of speech coded information has been described.
It is not limited to this.

The sampling frequency of one piece of speech coded information is one of the sampling frequencies of the other piece of speech coded information.
/ N times, based on the data of one frame of one piece of speech coded information, generate N blocks of the same size as the block when transmitting the data of one frame of the other piece of speech coded information. Then, the generated N blocks may be transmitted continuously. Here, N is a natural number of 2 or more.

[0046]

Embodiments of the present invention will be described below with reference to the drawings.

In the present specification, one frame of data of audio encoded information is the minimum unit that can be decoded or reproduced independently.

In this specification, a frame is
A predetermined section including a predetermined number (sample) of data in the data stream. The predetermined number is, for example, 1024.

In this specification, the term “transmission frame” refers to a transmission unit for transmitting one frame of data of speech coded information to a digital interface.

First, the principle of the present invention will be described.

FIG. 1 is a schematic diagram for explaining an audio data processing device 100 according to the present invention. The audio data processing device 100 includes a signal transmission device 101 that transmits a transmission signal 104 including audio encoding information, a digital interface 102 that mediates the transmission signal 104, and a transmission signal
And a signal receiving device 103 that receives the C.4. The digital interface 102 is, for example, a device that records the transmission signal 104. The signal receiving device 103 is, for example, a device that reproduces the transmission signal 104.

Here, a case is considered where audio encoded information having the same encoding scheme but different sampling frequencies is transmitted to the signal receiving apparatus 103 via the same digital interface 102. The transmission clock of the digital interface 102 and the reception clock of the signal receiving device 103 are constant, and it is assumed that the sampling frequency of the audio encoded information is 48 kHz.

In FIG. 1, one signal transmitting apparatus 101 is connected to one signal receiving apparatus 10 via one digital interface 102 in order to avoid excessively complicating the drawing.
3 shows that the transmission signal 104 is transmitted, but the present invention is not limited to this. For example, one digital interface 102 is connected to a plurality of signal receiving apparatuses 103, and a plurality of signal receiving apparatuses 103 transmit transmission signals 104 at a time.
May be transmitted. Alternatively, one signal transmission device 1
01 is connected to the plurality of digital interfaces 102 and the transmission signal 10
4 may be transmitted.

FIG. 2 shows the structure of a transmission frame according to the present invention, including speech coding information. The transmission frame is a part of the transmission signal 104, and the transmission frame is the signal transmission device 1
It is output continuously from 01.

FIG. 2A shows the structure of a transmission frame 200 including the speech coded information 203. Speech coded information 2
Reference numeral 03 denotes one frame of data obtained by dividing audio encoded information having a sampling frequency of 48 kHz into frame units. FIG. 2B shows the structure of the transmission frame 250 including the audio coding information 263.
The audio encoding information 263 has a sampling frequency of 24 kHz.
This is data of one frame obtained by dividing the audio coding information having z into frame units. Here, the encoding method of the audio encoded information 203 is the same as the encoding method of the audio encoded information 263.

As shown in FIG. 2A, the transmission frame 200 is composed of one block. Transmission frame 2
00 includes a header section 201 and a body section 202. Management information 211 is stored in the header section 201. Data information 212 is stored in the body part 202. The management information 211 includes synchronous word information 213 and side information 214. Data information 212 includes audio encoding information 203. Data information 212 is non-speech coded information 2
18 may be included.

[0057] The signal transmitting apparatus 101 shown in FIG.
0, and outputs a transmission signal 104 including a continuous transmission frame 200 to the digital interface 102.

The management information 211 is information for managing the data stored in the body section 202. Here, the speech coded information 203 and the non-speech coded information 2 are used as data.
18 are stored. The management information 211 includes information indicating whether the data stored in the body part 202 is valid. In this case, since the body part 202 stores the audio coding information 203, it indicates that the data stored in the body part 202 is valid. Synchronized word information 213
Is located at the head of the block of the transmission frame 200, and indicates the start of the block of the transmission frame 200. The synchronization word information 213 is used to derive a repetition time between the transmission frames 200 transmitted continuously. An example of information indicating whether the data stored in the body section 202 is valid is side information 214. Side information 214
Is information indicating whether or not the speech encoding information 203 is stored in the body part 202. The non-speech coded information 218 is information indicating that speech coded information is not included. The non-speech coded information 218 is used to make the size of the data information 212 constant.

As shown in FIG. 2B, the transmission frame 250 includes a first block 260 and a second block 2
80.

The first block 260 includes a first header section 261 and a first body section 262. The first header section 261 stores first management information 271. The first body information 262 includes first data information 2.
72 are stored. The first management information 271 includes first synchronization word information 273 and first side information 274. First
Data information 272 includes audio coding information 263.
First data information 272 may include non-speech coded information 278.

The first management information 271 is information for managing data stored in the first body part 262. Here, speech coded information 263 and non-speech coded information 278 are stored as data. The first management information 271 includes information indicating whether the data stored in the first body part 262 is valid. In this case, since the first body part 262 stores the audio coding information 263, it indicates that the data stored in the first body part 262 is valid. The first synchronization word information 273 is located at the beginning of the first block 260 of the transmission frame 250 and indicates the start of the first block 260. The first synchronization word information 273 is transmitted to the first block 26 which is continuously transmitted.
It is used to derive the repetition time between 0 and the second block 280. An example of the information indicating whether the data stored in the first body part 262 is valid is the first information.
Is the side information 274. First side information 274
Is information indicating whether or not the speech encoding information 263 is stored in the first body part 262. The non-speech coded information 278 is information indicating that speech coded information is not included. The non-speech coded information 278 is used to make the size of the first data information 272 constant.

The second block 280 includes a second header 281 and a second body 282. The second management information 291 is stored in the second header section 281. In the second body part 282, the second data information 2
92 are stored. The second management information 291 includes second synchronization word information 293 and second side information 294. The second data information 292 includes non-speech coded information 298.

The second management information 291 is information for managing data stored in the second body part 282. Here, non-speech coded information 298 is stored as data. The second management information 291 includes information indicating whether the data stored in the second body part 282 is valid. In this case, since the second body part 282 does not store the audio coding information, the second body part 282
Indicates that the data stored in is invalid. The second synchronization word information 293 is located at the head of the second block 280 of the transmission frame 250 and indicates the start of the second block 280. The second synchronization word information 293 is used to derive a repetition time between the first block 260 and the second block 280 that are continuously transmitted. An example of the information indicating whether the data stored in the second body part 282 is valid is the second side information 294. Second
Side information 294 is information indicating whether or not the audio encoding information is stored in the second body part 282. The non-speech coded information 298 is information indicating that speech non-speech information is not included. Non-speech coded information 298
Is used to make the size of the second data information 292 constant.

Here, the size of the first body part 262 is equal to the size of the second body part 282. Also,
The size of the first body part 262 is
Equal to the size of In addition, the header section 201, the first header section 261 and the second header section 281 are equal in size. Therefore, the first block 26
0, the second block 280, and the size of one block of the transmission frame 200 are equal to each other.

The signal transmitting apparatus 101 shown in FIG.
0, and outputs the transmission signal 104 including the continuous transmission frame 250 to the digital interface 102. The first block 260 is output before the second block 280.

Here, the conventional transmission frame 850 shown in FIG. 8B is compared with the transmission frame 250 according to the present invention shown in FIG. 3B. The data information 862 of the transmission frame 850 divided into two equal parts is the transmission frame 2
50 first data information 272 of the first block 260
And the second data information 292 of the second block 280. The size of the body part 852 is equal to the sum of the size of the first body part 262 and the size of the second body part 282. The audio coded information 263 corresponds to the audio coded information 853.

In FIG. 2B, the first synchronizing word information 2
73 indicates the start of the first block 260 and the second synchronization word information 293 indicates the start of the second block 280. Therefore, the repetition time of the first block 260 and the second block 280 is continuous. It is equal to the repetition time between transmission frames 200.

With this block configuration, even when the sampling frequency of audio encoded information 263 is different from the sampling frequency of audio encoded information 203, the repetition time of the transmission signal is equal. Therefore, the signal receiving device can appropriately receive the transmission signal without being notified of the change in the repetition time.

Since the first data information 272 includes the entire voice coded information 263, the second data information 292 indicates that the non-voice coded information 2 indicates that it does not include voice coded information.
98. Therefore, the audio coded information 263 itself is transmitted only in the first block 260 of the transmission frame 250. As a result, the signal receiving apparatus 103 can always set the delay time of the audio coded information to the same time.

The outline of the present invention will be summarized below.

According to the present invention, when the audio coded information has the sampling frequency F, the data generating section generates one block for one frame of data of the audio coded information, Information is sampling frequency 1 /
In the case of having 2 × F, one frame data of the audio coded information includes 1 block including the preceding block and the subsequent block.
Generate a set of blocks. Further, when the audio coded information has a sampling frequency of 1/2 × F, each of the preceding block and the subsequent block generated by the data generation unit for the data of one frame of the audio coded information. The size is equal to the size of one block generated by the data generation unit for one frame of data of the audio encoded information when the audio encoded information has the sampling frequency F. Further, each of the blocks generated by the data generator includes synchronization word information indicating the start of the block.

Therefore, the sampling frequency 1/2 ×
The repetition time between blocks generated for the audio encoded information of F is equal to the repetition time between blocks generated for the audio encoded information of the sampling frequency F. As a result, the signal transmission device has a sampling frequency of 1
It is possible to transmit the audio coded information having / 2 × F and the audio coded information having the sampling frequency F without notifying the change of the repetition time.

According to the present invention, the management information stored in the header portion of the block generated by the data generation portion includes information indicating whether the data stored in the body portion of the block is valid. Including. Therefore, the signal receiving device that receives this block searches the header portion for information indicating whether the data stored in the body portion of the block is valid, and searches for the data stored in the body portion of the block. Is valid or not.

According to the present invention, when the audio coded information has a sampling frequency of 1/2 × F, the data of one frame of the audio coded information is stored in the body of the previous block, Information indicating that the data stored in the body of the previous block is valid is stored in the header of the previous block, and the header of the subsequent block is stored in the body of the subsequent block. Information indicating that the data is invalid is stored. Therefore, the signal receiving apparatus can extract the audio coding information by extracting only the body part of the previous block.
Also, in this case, the signal receiving apparatus determines that the 1
The delay time for receiving frame data is constant.

FIG. 3 shows the structure in the transmission frame shown in FIG. 2 in more detail. 3, the same members as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 3A, side information 214 includes data type information 215 and payload length information 216. The data type information 215 is information indicating an encoding method of data stored in the body part 202. The payload length information 216 is stored in the body part 202.
This is information indicating the length (payload length) of the audio coded information 203 in.

[0077] Data information 212 may include stuffing information 215. The stuffing information 215 is 0
, And is one form of non-speech coded information 218.

The burst information 221 includes the synchronization word information 213
, Side information 214, and audio encoding information 203. The burst information 221 indicates a data packet of the transmission frame 200.

As shown in FIG. 3B, the first side information 274 includes first data type information 275 and first payload length information 276. The first data type information 275 is information indicating an encoding method of data stored in the first body part 262. The first payload length information 276 is information indicating the length (first payload length) of the audio encoded information 263 in the first body part 262.

The first data information 272 may include the stuffing information 279. Staffing information 27
Reference numeral 9 denotes information stuffed with 0, which is a form of non-speech coded information 278.

The first burst information 277 includes first synchronizing word information 273, first side information 274, and audio coding information 263. The first burst information 277 is
A packet of the data of the first block 260 is meant.

The second side information 294 includes second data type information 295 and second payload length information 296. In one embodiment, the second data type information 2
95 may be information indicating the encoding method of the data stored in the second body part 282. In another form,
The second data type information 295 includes the second body part 2
The information may indicate the encoding method of the data stored in the first body part 262 of the first block 260 regardless of the encoding method of the data stored in 82. The second payload length information 296 is information indicating the length (second payload length) of the audio encoded information in the second body part 282. In this case, the second payload length information 296 is
It indicates that the second payload length of the second body part 282 is less than the minimum value (for example, 0). Signal receiving device 1
03 retrieves the second payload length information 296,
It is possible to determine that the second block 280 does not include the audio coding information without directly detecting the entire inside of the second body part 282.

The second data information 292 may include stuffing information 299. Staffing information 29
Reference numeral 9 denotes information stuffed with 0, which is a form of non-speech coded information 298.

The second burst information 297 includes second synchronization word information 293 and second side information 294. The second burst information 297 indicates a packet of data of the second block 280.

The signal transmitting apparatus 101 shown in FIG.
0, and outputs the transmission signal 104 including the continuous transmission frame 250 to the digital interface 102.

According to this embodiment, the repetition time of the transmission signal including audio coded information 203 is the same as the repetition time of the transmission signal including audio coded information 263.
Therefore, the data type information only needs to indicate the encoding method of the data stored in the body part of the corresponding block without including information on the repetition time. Further, the second data type information 295 may indicate an encoding method of the audio encoding information 263 stored in the first body part 262 indicated by the first data type information 275.

The signal receiving apparatus 103 has the first payload length information 276 and the second payload length information 296
, And extracting only the inside of the body part of the block that does not indicate that the payload length is less than the minimum value, it is possible to receive the voice encoded information without performing an extra operation.

Hereinafter, the configuration of signal transmitting apparatus 101 and signal transmitting apparatus 103 according to the present embodiment will be described. In the following description, MPEG2 AAC (Advanc)
A case where an elementary stream (hereinafter, AAC stream) in the ADTS format of edAudio Coding is transmitted will be considered.

Here, the sampling frequency of the AAC stream is 24 kHz and the digital interface 102
And the sampling frequency of the speech coded information assumed by the reception clock of the
8 kHz. Note that in this case, the size of the transmission frame 200 is 32768 bits.

FIG. 4 shows a signal transmitting apparatus 101 according to the present invention.
3 shows an exemplary configuration of

[0091] The signal transmission device 101
0 and a data output unit 450. Data generator 40
0 indicates the bit counter 411 and the information switching unit 412
, A block counter 413, a stuffing information generator 414, a stream buffer 415, and a management information generator 420. The management information generation section 420 includes a synchronization word information generation section 421 and a side information generation section 422. The side information generation unit 422 includes a data type information generation unit 431 and a payload length information generation unit 432.
The data output unit 450 includes an output buffer 451.

Hereinafter, the signal transmitting apparatus 101 will be described with reference to FIG.
A case of transmitting the transmission frame 250 including the first block 260 and the second block 280 shown in (b) will be described.

The sizes of the components in the transmission frame 250 in this case are shown below.

The size of each of the first block 260 and the second block 280 is 32768 bits. First header section 261 and second header section 2
The size of each of 81 is 64 bits. The size of each of the first synchronization word information 273 and the second synchronization word information 293 is 32 bits. First side information 27
The size of each of the fourth and second side information 294 is 32 bits. The size of each of the first data type information 275 and the second data type information 295 is 16 bits. The size of each of the first payload length information 276 and the second payload length information 296 is 16 bits.

First, the signal transmitting apparatus 101 generates the first block 260 of the transmission frame 250 and generates the generated first block 260.
Will be described.

After starting the signal transmitting apparatus 101, the AAC stream is input to the stream buffer 415.
The AAC stream has header information and data information. The header information of the AAC stream includes information on data information of the AAC stream. The header information of the AAC stream includes, for example, information on the sampling frequency of the data information of the AAC stream and AA stream.
It includes information on the frame length indicating the length of one frame of the data information of the C stream and information on the type of data information of the AAC stream. The information on the type of data information includes information on an encoding scheme.

[0097] The stream buffer 415 outputs the data information of the AAC stream to the information switching unit 412. The stream buffer 415 extracts the header information of the AAC stream, and outputs the extracted header information to the management information generation unit 420.

The side information generator 422 in the management information generator 420 generates first side information 274 based on the header information of the AAC stream output from the stream buffer 415, and generates the generated first side information 27.
4 is transmitted to the information switching unit 412.

More specifically, the data information type information generation section 431 in the side information generation section 422 generates the first data type information based on the information on the type of the AAC stream data information included in the header information of the AAC stream. 275 is generated, and the generated first data type information 275 is transmitted to the information switching unit 412. The payload length information generation unit 431 in the side information generation unit 422
First payload length information 276 based on frame length information included in the header information of the AAC stream.
Is generated, and the generated first payload length information 276 is transmitted to the information switching unit 412.

The synchronizing word information generating section 421 in the management information generating section 420 generates first synchronizing word information 273 and transmits it to the information switching section 412.

The stuffing information generating section 414 outputs the stuffing information 279 to the information switching section 412.

The information switching unit 412, based on the signal from the bit counter 411, at least data information of one frame of the AAC stream (that is, audio coding information 263), first synchronizing word information 273, and first synchronizing word information 273. Data type information 275 and first payload length information 27
6 and stuffing information 279, and outputs the selected information to the output buffer 451.

The output buffer 451 includes the information switching unit 4
The information output from 12 is output to the digital interface 102 as a first block 260. In addition,
As described with reference to FIGS. 2 and 3, the transmission frame 250 is a part of the transmission signal 104, and the transmission frame 250 is continuously output. The transmission frame 250 is
It includes a first block 260 and a second block 280.

The bit counter 411 has the output buffer 4
The number of bits of the first block 260 output by 51 is counted. The information switching unit 412 outputs the information selected based on the value counted by the bit counter 411 to the output buffer 451. The information switching unit 412 selects information in the order in which the first block 260 is configured and outputs the information to the output buffer 451.

The first block 2 from the output buffer 451
The value of the bit counter 411 when the first 60 bits are output is set to 0. Each time the first block 260 outputs one bit from the output buffer 451, the value of the bit counter 411 increases by one. The value of the bit counter 411 increases to the maximum value, returns to 0, and increases again to the maximum value. The maximum value is stored in the first block 260
, That is, the size of the transmission frame 200. In the case of the present embodiment, the maximum value of the bit counter 411 is 32768. With such a configuration, different numbers can be assigned to all the bits output in the block.

While the value of the bit counter 411 is between 0 and 31, the information switching section 412 outputs the first synchronizing word information 273. Next, the information switching unit 412 outputs the first side information 274 while the value of the bit counter 411 is between 32 and 63. Specifically, while the value of the bit counter 411 is between 32 and 47, the information switching unit 412 outputs the first data type information 275, and outputs the first data type information 275.
While the value of 1 is between 48 and 63, the information switching unit 412 outputs the first payload length information 276.

When the value of the bit counter 411 is from 64 to the data information of the AAC stream for one frame (ie,
Until the audio encoded information 263) is output, the information switching unit 412 outputs the audio encoded information 263.

At this time, the value of the bit counter 411 becomes 6
From 4 to 64 and the sum of the values indicated by the first payload length information, the information switching unit 412 converts the data information of the AAC stream into the output buffer 451 as the audio encoded information 263.
Output to In this case, the bit counter 411
Is the first side information 2 from the side information generation unit 422.
Based on 74, a signal for controlling the information switching unit 412 is controlled. Specifically, the bit counter 411
Controls a signal for controlling the information switching unit 412 based on the first payload length indicated by the first payload length information 276 generated by the payload length information generation unit 432.

The size of the first burst information 277 is
Is smaller than the size of the block 260, the information switching unit 412 outputs the stuffing information 279 until the value of the bit counter 411 is reset to 0 from the sum of 64 and the value of the first payload length.

When the value of the bit counter 411 reaches the maximum value, the value of the bit counter returns to 0, and at the same time, the value of the block counter 413 is updated from 1 to 0. At this time, the output of the first block 260 ends, and then the second
The output of the block 280 is started.

The value of the block counter 413 is updated to 1 when the value of the bit counter 411 returns to 0 again. At this time, the output of the second block 280 ends, and then the output of the first block 260 corresponding to another piece of speech coding information starts.

Block counter 413 indicates which block of the transmission frame the signal output from output buffer 451 relates to.

In one embodiment, when the value of the block counter 413 is 0, the payload length information generation unit 43
2 converts the information related to the frame length of the header information of the AAC stream into the number of bits, and generates first payload length information 276. The generated first payload length information 276 is output from the output buffer 451 via the information switching unit 412. First payload length information 2
76 is located in a 16-bit bit field in the first block 260.

When the value of the block counter 413 is not 0 (ie, 1), that is, when the second block 28
When transmitting 0, the operation of the data generation unit 400 when the value of the bit counter 411 is between 0 and 47 is the same as that when transmitting the first block 260.

The payload length information generating section 432 converts the second payload length information 296 into the first payload length information 27.
6. Generated in the same way as 6. The speech encoding information 263 included in the transmission frame 250 is all included in the first block,
Since the second body part 282 of the block 280 does not store the audio coding information, the second payload length information 29
No. 6 is 0 in all 16-bit bit fields of the area. Alternatively, the second payload length information 296 is
It has a value less than the minimum value. In any case, the second payload length information 296 is the second payload length information 296 in the second body part 282.
Indicates that the payload length is zero. When the value of the bit counter 411 is between 48 and 63, the information switching unit 412
Outputs the second payload length information 296.

Since the second payload length is 0, the information switching section 412 outputs the stuffing information 299 to the output buffer 451 while the value of the bit counter 411 is between 63 and the maximum value.

When operating as described above, signal transmitting apparatus 101 extracts audio coded information 263 from the AAC stream input to signal transmitting apparatus 101, and transmits the extracted audio coded information 263.

When transmitting transmission frame 200, signal transmitting apparatus 101 similarly extracts audio coded information 203 from the AAC stream input to signal transmitting apparatus 101, and transmits extracted audio coded information 203. I do. Generation of the transmission frame 200 is based on the first transmission frame 250.
The operation of generating the block 260 of FIG.

[0119] The stream buffer 415, based on the header information of the input AAC stream,
The sampling frequency of the data information of the AC stream may be derived, and the operation of the bit counter 411 and the operation of the information switching unit 412 controlled by the value of the bit counter 411 may be changed based on the derived sampling frequency.

For example, the bit count 411 may change the control of the information switching unit 412 based on the data type information output from the data type information generation unit 431. Alternatively, the control of the information switching unit 412 may be changed based on information on the type of data information included in the header information of the AAC stream extracted in the stream buffer 415.

The signal transmitting apparatus 101 according to the present embodiment generates a transmission signal having the same repetition time when the sampling frequency of the audio coding information is different, and performs the audio coding only on the first block of the two blocks. A transmission signal 104 including information can be output. At this time, the signal receiving apparatus 103 can identify a block including the audio coding information and a block not including the audio coding information in the transmission signal 104, and can correctly receive the signal.

Also, regardless of the ratio between the transmission clock of the digital interface 102 and the reception clock of the signal receiving device 103 and the sampling frequency of the AAC stream, the transmission clock of the digital interface 102 and the reception clock of the signal reception device 103 If does not change, the signal receiving apparatus 103 can receive the transmission signal 104 including the audio encoding information having the same delay time and different sampling frequencies. Therefore, the signal receiving device 103 can be easily synchronized with any other device.

In the above description, the already encoded AA
Although the case where the C stream is input to the stream buffer 415 has been described, the present invention is not limited to this. The data generation unit 400 may include a device that encodes audio information, and the audio information may be directly input to the data generation unit 400.

FIG. 5 shows a signal receiving apparatus 103 according to the present invention.
3 shows an exemplary configuration of

Signal receiving apparatus 103 includes synchronization establishing section 510
And a voice coded information extraction unit 520 and a payload length analysis unit 530. Synchronization establishing section 510 includes a bit counter 511. The audio encoded information extracting unit 520 includes an information switching unit 521 and a stream buffer 522.

Hereinafter, the signal receiving apparatus 103 will be described with reference to FIG.
The case where the transmission frame 250 including the first block 260 and the second block 280 shown in (b) is received will be described.

The signal receiving apparatus 103 searches for the first synchronizing word information 273 in the transmission signal 104 input via the digital interface 102 by using the synchronization establishing section 510.

The first block 26 of the transmission frame 250
After finding the first synchronization word information 273 in 0, the synchronization establishing section 510 analyzes the first data type information 275 included in the first management information 271.

As a result of the analysis, when it is determined that the encoding method of the audio encoding information 263 of the first block 260 is a desired type (for example, AAC stream), the bit counter 511 in the synchronization establishing section 510 is reset. , The magnitude corresponding to the repetition time of the signal (32768 in this case)
Bit) to be reset to 0 every time.

Synchronization establishing section 510 determines whether the synchronization of transmission signal 104 has been established. The determination of the synchronization is based on, for example, whether the second synchronization word information 293 exists after the first block 260 from the found first synchronization word information 273. Alternatively, the determination of synchronization is, for example,
It is based on whether or not it is possible to find the synchronizing word information five times consecutively for each interval (32768 bits) between the first block 260 and the second block in the transmission signal 104. When synchronization is established, the bit counter 511 reads the first synchronization word information 273 at the beginning of the first synchronization word information 273.
Is set so that the value of the bit counter 511 becomes 0 at the point indicating the start of the block.

The digital interface 102 sends the first
Each time one block of the block 260 is input, the value of the bit counter 511 is changed from 0 to the maximum value (that is, 3276).
Increase by 1 until 7). The value of the bit counter 511 is reset to 0 after reaching the maximum value. By doing so, the first synchronization word information 273 of the first management information 271
The bit counter 511 can be operated such that the value of the bit counter 511 is reset to 0 at the beginning of the second management information 291 or at the beginning of the second synchronization word information 293 of the second management information 291.

When synchronization establishment section 510 determines that synchronization has been established, transmission frame 250 is output to speech coded information extraction section 520.

The information switching unit 521 is based on the value of the bit counter 511 (specifically,
1 is between 48 and 63), the first payload length information 276 of the first block 260 in the transmission frame 250
And the second payload length information 2 of the second block 280
The output destination of the transmission frame 250 is switched so that the transmission frame 250 is output to the payload length analysis unit 530.

The payload length analysis unit 530 analyzes the first payload length information 276 in the first block 260 or the second payload length information 296 in the second block 280, and Long or second
Deriving the payload length of

In one embodiment, when the value of the bit counter 511 becomes 48, the payload length analysis unit 5
30 is activated and analyzes the 16 bits of the first block 260 and the second block 280 in the range where the value of the bit counter 511 indicates 48 to 63, and specifies the first payload length and the second payload length. .

As a result of the analysis by the payload length analysis unit 530, if the payload length is determined to be 0, that is, if there is no audio coding information in the analyzed block, the audio coding information extracting unit 520 performs the payload length analysis. Part 53
Based on the signal from “0”, the information of the transmission frame 250 is skipped until the bit counter 511 is reset to “0”. That is, when the payload length of the block is 0, the information switching unit 521 of the audio coded information extraction unit 520 does not output the information of the transmission frame to the stream buffer 522.

When it is determined that the payload length is not 0 as a result of the analysis by the payload length analysis unit 530, based on the signal from the payload length analysis unit 530,
The information switching unit 521 outputs the audio encoding information to the stream buffer 522 until the value of the bit counter becomes 64 to 64 and the sum of the payload length. The stream buffer 522 can output the audio coding information in any form.

By performing the above operation, the signal receiving apparatus 103 can receive the voice coded information transmitted via the digital interface 102 and correctly extract only the voice coded information. it can.

In the above description, establishment of synchronization is determined when synchronization word information is found five times in succession at a predetermined repetition time. However, the present invention is not limited to five times. If it can be synchronized accurately, the number of discoveries does not depend on how many times it has been made. Further, if similar effects can be obtained, they need not be continuously discovered.

In the above description, the sampling frequency 24
The case where the audio encoded information of kHz or 48 kHz is output to the digital interface assuming the sampling frequency of 48 kHz has been specifically described. With this configuration, it is possible to transmit speech coded information having different sampling frequencies without notifying or changing the repetition time of the transmission signal.

In the above description, one sampling frequency among the different sampling frequencies of the audio coding information is １ ／ of the other sampling frequency, but the present invention is not limited to this. The present invention is applicable even if one sampling frequency is 1 / N times the other sampling frequency. Here, N is an arbitrary natural number of 2 or more.

In this case, the number of blocks in the transmission frame is N. Also in this case, only the data information of the first block that is output first among the N blocks includes the audio coding information, and the data information of all the blocks other than the first block includes the audio coding information. Since it is information indicating that it does not include, it is sufficient to extract the audio coding information only from the data information of the first block.

Hereinafter, when N is other than 2, specifically N
Is 4, the structure of the transmission frame according to the present invention will be described.

FIG. 6 shows a structure of a transmission frame 600 including four blocks according to the present invention.

For example, audio encoded information 62 which is one frame of data obtained by dividing audio encoded information having a sampling frequency of 12 kHz into frame units.
5 is transmitted to the digital interface 102 and the signal receiving device 103 assuming a sampling frequency of 48 kHz, has a transmission frame 600 shown in FIG.

The repetition time of the block of the transmission frame 600 according to the present invention is such that the transmission signal for transmitting one frame of data of the speech coded information having a sampling frequency of 48 kHz to a digital interface and a signal receiving device which assumes a sampling frequency of 48 kHz Is equal to the repetition time.

The transmission frame 600 is composed of the first block 6
10, the second block 630, and the third block 65
0 and a fourth block 670.

[0148] The first block 610 includes a first header section 611 and a first body section 612. The first header information 621 is stored in the first header section 611. The first body information 612 includes the first data information 6.
22 are stored. The first management information 621 includes first synchronization word information 623 and first side information 624. The first data information 622 includes audio coding information 625 and stuffing information 626.

The second block 630 includes a second header section 631 and a second body section 632. The second header information 631 is stored in the second header section 631. In the second body part 632, the second data information 6
42 is stored. The second management information 641 includes second synchronization word information 643 and second side information 644. The second data information 642 includes stuffing information 645.

The third block 650 includes a third header 651 and a third body 652. Third management information 661 is stored in the third header section 651. The third body information 652 is provided in the third body part 652.
62 is stored. The third management information 661 includes third synchronization word information 663 and third side information 664. The third data information 662 includes stuffing information 665.

[0151] The fourth block 670 includes a fourth header section 671 and a fourth body section 672. The fourth header 671 stores fourth management information 681. The fourth body part 672 includes fourth data information 6
82 is stored. The fourth management information 681 includes fourth synchronization word information 683 and fourth side information 684. The fourth data information 682 includes stuffing information 685.

Here, the first synchronizing word information 623 and the second synchronizing word information 643 correspond to the first block 610 and the second
Is used to derive the repetition time with block 630 of FIG. The second synchronization word information 643 and the third synchronization word information 663 are used to derive the repetition time of the second block 630 and the third block 650.
Third synchronization word information 663 and fourth synchronization word information 683
Is used to derive the repetition time of the third block 650 and the fourth block 670. Also, the fourth
The synchronization word information 683 of another transmission frame 60
Together with the first synchronization information 623 of 0, it is used to derive the repetition time of the corresponding block.

In the above description, one frame of the MPEG2 AAC stream is described as a specific example of the audio coded information, so that the bit counters 411 and 511 are used.
Was 32768, but the present invention is not limited to this. The maximum value of the bit counter is a value depending on the number of samples included in the audio encoding information, and differs for each encoding method.

Even when the audio coding information is other than the AAC stream, it is possible to transmit the audio coding information of different sampling frequencies at the same repetition time.

[0155]

Thus, according to the present invention, the repetition time between blocks generated for speech coded information having a sampling frequency of 1 / N × F is generated for speech coded information having a sampling frequency of F. Is equal to the repetition time between the blocks to be performed. As a result, the signal transmitting apparatus outputs speech encoded information having a sampling frequency of 1 / N × F,
The audio coding information having the sampling frequency F can be transmitted without notifying the change of the repetition time. Therefore, when the coding method of the voice coded information is the same and the sampling frequency is different, the transmission signal can be defined by the same data type information.

Further, the signal receiving apparatus for receiving the transmission signal generated by the signal transmitting apparatus or the signal transmitting method according to the present invention determines whether the data stored in the body part of the block in the header part is valid. Search for the information shown,
It can be determined whether the data stored in the body part of the block is valid.

Further, a signal receiving apparatus for receiving a transmission signal generated by the signal transmitting apparatus or the signal transmitting method of the present invention extracts audio coded information by extracting only a body part of a block output first. be able to. Further, in this case, the delay time for the signal receiving device to receive one frame of data of the speech coded information is constant.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an audio data processing device according to the present invention.

FIGS. 2A and 2B are diagrams showing the structure of a transmission frame including audio coding information according to the present invention, including (a) a configuration of a transmission frame including audio coding information having a sampling frequency of 48 kHz, and (b) a sampling frequency; The figure which shows the structure of the transmission frame containing the speech encoding information of 24kHz.

3A is a diagram illustrating a detailed configuration of the transmission frame illustrated in FIG. 2A, and FIG. 3B is a diagram illustrating a detailed configuration of the transmission frame illustrated in FIG. 2B.

FIG. 4 is a block diagram of a signal transmission device according to the present invention.

FIG. 5 is a block diagram of a signal receiving device according to the present invention.

FIG. 6 is a diagram showing a configuration of a transmission frame according to the present invention including audio encoded information having a sampling frequency of 12 kHz.

FIG. 7 is a schematic diagram illustrating a conventional audio data processing device.

FIG. 8 is a diagram showing a structure of a conventional transmission frame including speech coding information, and (a) a sampling frequency of 48 k;
And (b) is a diagram illustrating a configuration of a transmission frame including audio encoding information having a sampling frequency of 24 kHz.

[Explanation of symbols]

 200 transmission frame 201 header part 202 body part 203 voice coding information 211 management information 212 data information 213 synchronization word information 214 side information 218 non-voice coding information 250 transmission frame 260 first block 261 first header section 262 first 263 Speech coding information 271 First management information 272 First data information 273 First synchronization word information 274 First side information 278 Non-speech coding information 280 Second block 281 Second header part 282 second body part 291 second management information 292 second data information 293 second synchronization word information 294 second side information 298 non-speech coded information

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazunori Abe 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Takashi Katayama 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shoji Matsumoto 1006 Odaka Kadoma, Kadoma City, Osaka Pref. 1006 Kadoma Kadoma, Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D045 DA11 5K041 CC01 EE01 HH02 5K047 AA15 DD01 HH01 HH12 HH31 MM02 MM11

Claims (10)

[Claims] 1. A signal transmitting apparatus for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving apparatus via a digital interface, wherein each of the plurality of pieces of audio encoded information is , The sampling frequency F or the sampling frequency Ｆ × F, and the signal transmission device converts the speech coding information into one frame data obtained by dividing the speech coding information into frame units. A data generator for generating at least one block based on the at least one block generated by the data generator;
A data output unit that outputs one block to the digital interface, wherein each of the at least one block includes a body unit, and a header unit that stores management information for managing data stored in the body unit. The management information, the synchronization word information indicating the start of the block,
And information indicating whether the data stored in the body part is valid. If the audio encoding information has a sampling frequency F, the data generation unit performs the audio encoding. One block is generated for data of one frame of information, and one frame of data of the audio coding information is stored in the body of the generated block, and the header of the generated block is stored in the header of the generated block. When management information including information indicating that the data stored in the body portion is valid is stored, and when the audio encoding information has a sampling frequency of 1/2 × F, the data generation unit Generating a set of blocks including a previous block and a subsequent block for one frame of data of the audio coding information, and generating a body part of the generated previous block; And stores management information including information indicating that the data stored in the body portion is valid in a header portion of the generated previous block, while storing data of one frame of the audio coding information. Storing management information including information indicating that data stored in the body portion is invalid in a header portion of the generated block, wherein the audio encoding information has a sampling frequency of 1/2 × F. If the audio encoding information has a sampling frequency F, the size of each of the previous block and the subsequent block generated by the data generation unit A signal transmission device, which is equal to the size of one block generated by. 2. The information indicating whether data stored in the body part is valid is side information indicating whether or not the speech coding information is stored in the body part, and The method according to claim 1, wherein the side information indicates that data stored in the body part is invalid when the information indicates that the voice encoding information is not stored in the body part. Signal transmission device. 3. The signal transmitting apparatus according to claim 1, wherein the data generator stores stuffing information in a body of the subsequent block. 4. The management information further includes data type information indicating a coding method of data stored in the body part, and the data type information of the preceding block includes a data signal having a sampling frequency F Is the same as the data type information of the block generated when having, the data type information of the subsequent block, regardless of the encoding method of the data stored in the body part of the subsequent block, The signal transmission device according to claim 1, wherein an encoding method of data stored in the body part of the previous block is indicated. 5. A signal transmitting apparatus for transmitting a plurality of pieces of speech coded information encoded according to the same coding scheme to a signal receiving apparatus via a digital interface, wherein each of the plurality of pieces of speech coded information is , Sampling frequency F or sampling frequency 1 / N × F, where N is 2
A data generation unit configured to generate at least one block based on one frame of data obtained by dividing the speech coded information into frame units; The at least one generated by the unit
A data output unit that outputs one block to the digital interface, wherein each of the at least one block includes a body unit, and a header unit that stores management information for managing data stored in the body unit. The management information, the synchronization word information indicating the start of the block,
And information indicating whether the data stored in the body part is valid. If the audio encoding information has a sampling frequency F, the data generation unit performs the audio encoding. One block is generated for data of one frame of information, and one frame of data of the audio coding information is stored in the body of the generated block, and the header of the generated block is stored in the header of the generated block. When management information including information indicating that the data stored in the body portion is valid is stored, and when the audio encoding information has a sampling frequency of 1 / N × F, the data generation unit Generating a set of blocks including N blocks for one frame of data of the audio coded information, and outputting the set of blocks at the beginning of the generated N blocks One frame of data of the audio coded information is stored in a body part of the first block, and information indicating that the data stored in the body part is valid is included in a header part of the first block. Storing management information, and storing management information including information indicating that data stored in the body portion is invalid in a header portion of a block other than the first block of the generated N blocks. And when the audio coding information has a sampling frequency of 1 / N × F, the N
The signal transmission device, wherein a size of each of the blocks is equal to a size of one block generated by the data generation unit when the audio coding information has a sampling frequency F. 6. A signal transmission method for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving device via a digital interface, wherein each of the plurality of pieces of audio encoded information is , A sampling frequency F or a sampling frequency ×× F, and the signal transmission method includes: converting one frame of data obtained by dividing the audio coding information into frame units Generating at least one block based on the at least one block, and outputting the generated at least one block to the digital interface, wherein each of the at least one block is a body part and the body part. To store management information for managing the data stored in Has a chromatography unit, the management information includes synchronization word information indicating the start of a block,
And information indicating whether the data stored in the body part is valid. If the audio encoding information has a sampling frequency F, the generating includes the audio encoding One block is generated for one frame of information data, and one frame of data of the audio encoding information is stored in a body part of the generated block.
Storing management information including information indicating that data stored in the body part is valid in a header part of the generated block, wherein the audio coding information has a sampling frequency of 1/2 × F In the case of having, the generating step generates a set of blocks including a previous block and a subsequent block with respect to one frame of data of the audio coding information, One frame of data of the audio coding information is stored in the body of the previous block, and information indicating that the data stored in the body is valid is stored in the header of the generated previous block. Management information including management information including information indicating that data stored in the body portion is invalid in a header portion of the generated block. Storing the size of each of the previous block and the subsequent block generated when the audio encoding information has a sampling frequency of 1/2 × F, A signal size equal to the size of one block generated when has a sampling frequency F. 7. The information indicating whether data stored in the body part is valid is side information indicating whether or not the speech coding information is stored in the body part, and the side information indicates whether the data is stored in the body part. The side information according to claim 6, wherein when the information indicates that the voice encoding information is not stored in the body part, the side information indicates that data stored in the body part is invalid. Signal transmission method. 8. The signal transmission method according to claim 6, wherein said generating step stores stuffing information in a body part of said subsequent block. 9. The management information further includes data type information indicating a coding method of data stored in the body part, and the data type information of the previous block includes a data signal having a sampling frequency F. Is the same as the data type information of the block generated when having, the data type information of the subsequent block, regardless of the encoding method of the data stored in the body part of the subsequent block, The signal transmission method according to claim 6, wherein an encoding method of data stored in the body part of the previous block is indicated. 10. A signal transmission method for transmitting a plurality of pieces of audio encoded information encoded by the same encoding method to a signal receiving device via a digital interface, wherein each of the plurality of pieces of audio encoded information is , Sampling frequency F or sampling frequency 1 / N × F, where N is 2
A natural number as described above, wherein the signal transmission method includes: generating at least one block based on data of one frame obtained by dividing the audio coding information into frame units; Outputting one block to the digital interface, wherein each of the at least one block includes a body part, and a header part storing management information for managing data stored in the body part. The management information, the synchronization word information indicating the start of the block,
And information indicating whether the data stored in the body part is valid. If the audio encoding information has a sampling frequency F, the generating includes the audio encoding One block is generated for data of one frame of information, and one frame of data of the audio coding information is stored in a body part of the generated block.
Storing the management information including information indicating that the data stored in the body part is valid in a header part of the generated block, wherein the audio encoding information has a sampling frequency of 1 / N × F And the generating step generates a set of blocks including N blocks for one frame of data of the audio coded information, and generates the generated N
One frame of data of the speech coded information is stored in the body part of the first block that is output first of the blocks, and the body part is stored in the header part of the first block. The management information including information indicating that the data is valid is stored, and the data stored in the body portion is invalid in a header portion of a block other than the first block of the generated N blocks. Storing management information including information indicating that there is a size of each of the N blocks generated when the audio coding information has a sampling frequency of 1 / N × F. Is a signal transmission method that is equal to the size of one block generated when the audio coding information has a sampling frequency F.