JP3885068B2 - Digital data receiving apparatus, digital data receiving method, and computer program - Google Patents

Description

  The present invention relates to a digital data receiving apparatus, a digital data receiving method, and a computer program, and is particularly suitable for use in time division multiplexing of an MPEG2 stream and arbitrary data.

  MPEG2 TS (Transport Stream; Transport Stream) includes reference clock information called PCR (Program Clock Reference) (SCR (System Clock Reference) of MPEG2 (System Stream Reference)) and DTS (DecodeTime). Program synchronization information of decoding time and display time called “Stamp) · PTS (Presentation Time Stamp)” is included. In order to synchronize the program assumed by the transmission side, the reception side needs to correct the system clock based on the PCR.

  There are two types of system clock correction, and the difference between the PCR arrival time assumed by the transmission side and the actual PCR arrival time is detected as a PCR fluctuation. The correction is performed by raising and lowering the system clock frequency within a predetermined range. In the present specification, the former operation for adjusting the clock value on the transmitting side (PCR counter value) to the clock value on the receiving side is described as “PCR reference time correction”, and the latter PCR fluctuation correction is referred to as “PCR fluctuation correction”. ".

  After the receiving device receives an MPEG2 TS (hereinafter referred to as “MPEG2TS”), a request to transmit MPEG2 TS simultaneously with other data such as JPEG and DV (Digital Video) input from an external input device is input This is conceivable in the case where a transmission path is interposed between the input management unit that manages the data and the signal processing unit that processes the data. However, since MPEG2TS performs PCR reference time correction and PCR fluctuation correction according to the arrival time of PCR as described above, it is not easy to time-division multiplex MPEG2TS and arbitrary data. Here, the arbitrary data is image data, audio data, control system data, and the like.

  In general, when MPEG2TS is transferred from one processing unit to another processing unit, the transmission path is occupied by MPEG2TS, and MPEG2TS and other data are not transferred in parallel. When sharing with other data, the program synchronization information is discarded by not performing the program synchronization using the PCR. A general technique for reflecting the synchronization information such as PCR while sending JPEG and DV information in parallel with MPEG2TS in the prior art is to demultiplex MPEG2TS once and then multiplex it again to MPEG2TS including JPEG and DV. However, there is a problem that both the processing amount and the memory used increase.

  Japanese Patent Laid-Open No. 2000-183841 gives a technique for multiplexing a plurality of TSs into one TS without demultiplexing, but does not mention multiplexing of MPEG2 TS and arbitrary data. It cannot be applied to other data.

JP 2000-183841 A

  The present invention has been made in view of the above-described problems, and an object thereof is to enable MPEG2 streams and other data to be transferred in parallel while maintaining program synchronization.

  The digital data receiving apparatus of the present invention divides a plurality of MPEG2 transport streams and a plurality of arbitrary data into 188 bytes, which is a data packet size of the MPEG2 transport stream, and converts the SYNC pattern of the MPEG2 transport stream. A multiplexer that changes and adds a different pattern for each content of a packet to be multiplexed to create a multiplexed stream, and a demultiplexer that separates the multiplexed stream created by the multiplexer, and performs the multiplexing The SYNC pattern that differs for each packet content is a pattern obtained by adding the number of packets of the arbitrary data inserted between the MPEG2 transport streams to a predetermined pattern indicating each stream. The features.

  The digital data receiving method of the present invention divides a plurality of MPEG2 transport streams and a plurality of arbitrary data into 188 bytes which is a data packet size of the MPEG2 transport stream, and converts the SYNC pattern of the MPEG2 transport stream. A multiplexed stream creating step for creating a multiplexed stream by adding different patterns depending on the contents of packets to be multiplexed, and a multiplexed stream for separating the multiplexed stream created by the multiplexed stream creating step A SYNC pattern that differs depending on the contents of the packet to be multiplexed is a predetermined pattern indicating each stream, and the arbitrary data inserted between the MPEG2 transport streams. Characterized in that it is a pattern obtained by adding the number of packets data.

  The computer program of the present invention divides a plurality of MPEG2 transport streams and a plurality of arbitrary data into 188 bytes which are the data packet size of the MPEG2 transport stream, and multiplexes the SYNC pattern of the MPEG2 transport stream. A multiplexed stream creating step for creating a multiplexed stream by adding a different pattern for each packet content to be converted, and a multiplexed stream separating step for separating the multiplexed stream created by the multiplexed stream creating step The SYNC pattern that differs depending on the content of the packet to be multiplexed is inserted between the MPEG2 transport streams into a predetermined pattern indicating each stream. Characterized in that it is a pattern obtained by adding the number of packets of said arbitrary data.

  According to the present invention, an MPEG2 stream and other data can be transferred in parallel while maintaining program synchronization, with only a slight modification to the transmission side and reception side of an existing apparatus. Also, a plurality of MPEG2 streams can be transferred in parallel.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of a digital broadcast receiving apparatus according to this embodiment.

  In this embodiment, the MPEG2TS input from the tuner, the JPEG input from the digital camera, and the DV stream input from the DV are received by the signal receiving unit, and are time-division multiplexed and transmitted to the signal processing unit. Then, MPEG2TS / JPEG / DV is decoded by the signal processing unit, and the output image is synthesized and displayed.

  In FIG. 1, 101 is an antenna for receiving a digital broadcast wave, 102 is a signal receiving unit in this system (also corresponding to the digital data transmitting apparatus of the present invention), 103 is a digital broadcast receiving tuner, 104 is a digital camera, etc. A USB interface 105 is provided as an I / O interface, and an IEEE 1394 interface is provided as an input / output interface such as DV.

  Reference numeral 106 denotes a multiplexer that time-division multiplexes various data strings input from the digital broadcast receiving tuner 103 and various interfaces 104 and 105 while adding packet arrival time correction information. 108 is a signal processing unit (also corresponding to the digital data receiving apparatus of the present invention) in this system, 107 is a transmission path for transmitting signals from the signal receiving unit 102 to the signal processing unit 108, and 109 is a multiplexer 106. It is a demultiplexer that decomposes multiplexed time-division multiplexed data. 110 is a PCR correction unit that corrects the system clock based on the packet arrival time correction information added by the multiplexer 106, 111 is an MPEG2 decoding unit that performs MPEG2 decoding, 112 is a JPEG decoding unit that performs JPEG decoding, and 113 is a DV. It is a DV decoding part which performs decoding. Reference numeral 114 denotes a synthesizing unit that synthesizes images output from the MPEG2 decoding unit 111, the JPEG decoding unit 112, and the DV decoding unit 113 in the screen, and 115 denotes an image display device (output device) such as a display.

  A digital broadcast signal received by the antenna 101, an image signal from a digital camera, and a DV signal from a digital video camera (DVC) are received by a signal receiving unit 102 in this system. The signal receiving unit 102 is a processing unit that processes an input signal based on a user input, data input, or the like. The signal receiving unit 102 includes a digital broadcast receiving tuner 103, a USB interface 104, and an IEEE 1394 interface 105, and each receives a digital broadcast MPEG2, a JPEG from a digital camera, and a DV stream from a DVC. The received signal is sent to the multiplexer 106 and multiplexed.

  The multiplexed packet format is, for example, as shown in FIG. In FIG. 2, reference numeral 116 denotes a SYNC area for identifying the beginning of a packet, and 117 denotes an Arrival_Revise_Flag area indicating whether or not an ARIVAL_REVISE is added to the packet. 118 is a Stream_Type area indicating the type of data stored in the Payload area 121 of this packet, 119 is a Stream_Id area indicating the stream number, 120 is an Arrival_Revise area indicating PCR correction information, and 121 is an actual data storage area. Payload area.

  Stream data input from the digital broadcast receiving tuner 103 and various interfaces 104 and 105 enters the payload area 121, and various headers 116 to 120 are added thereto. In particular, the information in the Arrival_Revise area 120 is information on the packet arrival time and is important. In this embodiment, the added information is the number of JPEG packets and DV packets inserted between original MPEG2 packets.

  The signal multiplexed by the multiplexer 106 is sent to the signal processing unit 108 of the system through the transmission path 107. The bandwidth of the transmission path 107 is arbitrary. The signal processing unit 108 is a processing unit that decodes and outputs a signal group input from the transmission path 107.

  The demultiplexer 109 receives the packet multiplexed by the multiplexer 106 and performs disassembly processing. Further, the demultiplexer 109 calculates the PCR information added to the original TS packet, the packet arrival time correction information added by the multiplexer 106, that is, the number of packets inserted between them and the bit rate of the transmission path 107. The PCR correction value is calculated and sent to the PCR correction unit 110.

  The PCR correction unit 110 corrects the PCR fluctuation of the system clock from the information. If the PCR reference time is not corrected, the system clock is corrected for the PCR reference time. The MPEG2 decoding unit 111 performs normal MPEG2 decoding, and outputs video and audio based on the system clock corrected by the PCR correction unit 110. The JPEG decoding unit 112 and the DV decoding unit 113 may be general ones. The completed image group is combined by the combining unit 114 and output from the image display device (output device) 115 as a multi-screen.

  The operation of the multiplexer 106 will be specifically described. The multiplexer 106 receives inputs from the digital broadcast receiving tuner 103 and the input / output interfaces 104 and 105 and converts them into data of a fixed size packet format as shown in FIG. The packet size may be arbitrary. Each stream body is arranged in the payload area 121. The packets are arranged in an appropriate order and output from the transmission path 107. The order of the packets may be appropriate. In this embodiment, the packets are arranged in the order input from the digital broadcast receiving tuner 103 and the input / output interfaces 104 and 105. A schematic diagram of multiplexing is shown in FIG.

  In FIG. 3, 122 is the original MPEG2TS stream, 123 is the original JPEG stream, 124 is the original DV stream, 125 is the multiplexed stream generated by this embodiment, 126 is the first MPEG2TS packet, and 127 is the first MPEG2TS packet. 1 is a JPEG packet, 128 is a first DV packet, 129 is a second MPEG2TS packet, and 130 is a third MPEG2TS packet.

Information added by the multiplexer 106 and operations of the demultiplexer 109 and the PCR correction unit 110 based on the information will be described more specifically.
There are two types of information added by the multiplexer 106: information added so that the multiplexed information can be decomposed by the demultiplexer 109, and information added as packet arrival time correction information.

  As the former, SYNC information for recognizing the head of the packet (SYNC area 116), information indicating the type of stream (MPEG2TS, JPEG, DV, etc.) contained in the packet payload area 121 (Stream_Type area 118), stream Information (Stream_Id area 119) is added to the file number (MPEG2TS number 3, JPEG number 2, etc.). The SYNC information may be any predetermined value, but 0x47 should be avoided because it is an MPEG2TS identifier.

  The latter includes information indicating whether or not packet arrival time correction information is added to the packet (Arrival_Revise_Flag area 117) and packet arrival time correction information main body (Arrival_Revise area 120).

  The number of arbitrary packets inserted between the original MPEG2 TS packets is added by the multiplexer 106 to the Arrival_Revise area 120 where the packet arrival time correction information is indicated. For example, in the example of FIG. 3, the first MPEG2 TS packet 126 and the second MPEG2 TS packet 129 are continuous packets on the original MPEG2 TS stream 122. However, since the first JPEG packet 127 and the first DV packet 128 are inserted between the first MPEG2TS packet 126 and the second MPEG2TS packet 129 by the multiplexer 106, the second MPEG2TS packet A numerical value “2” is added to the Arrival_Revision area 120 of 129.

  The demultiplexer 109 performs demultiplexing based on the demultiplexing information added by the multiplexer 105 and corrects the packet arrival time indicated by the PCR based on the packet arrival time correction information. Specifically, the value, packet size, and bit rate indicated in the Arrival_Revision area 120 are corrected to a PCR value obtained by delaying the original arrival time indicated by PCR. For example, in the example of FIG. 3, assuming that the value indicated in the Arrival_Revise area 120 is 2 packets, the packet size is 256 bytes, and the bit rate is 30 Mbps (= 30 × 1024 × 1024 ÷ 8 bytes / sec = 3932160 bytes / sec), the PCR correction value ΔPCR is as shown in the following (formula 1).

ΔPCR [sec] = 2 [packet] × 256 [Byte] / 3932160 [Byte / sec] ≈0.0001302 [sec] (1 formula)
Since the PCR counter value ΔPCR (2 packet delay in FIG. 3) has an accuracy of 27 MHz, the value for correcting the actual PCR value is as shown in (Formula 2) below.
ΔPCR [counter value] = 0.0001302 [sec] × 27000000 [Hz] ≈3515 [counter value] (2 formulas)
Therefore, as shown in FIG. 3, the PCR value of the second MPEG2 TS packet 129 can be expressed by the original PCR (= 13000) +2 packet delay (= 3515), and is 16515 obtained by adding 3515 to 13000.

  The PCR fluctuation amount is calculated using the PCR value corrected by the packet arrival time correction information and the actual arrival time, and the PCR correction unit 110 corrects the PCR fluctuation of the system clock. PCR reference time correction is also performed here. Further, the MPEG2 decoding unit 111 and the synthesizing unit 114 require PTS / DTS for decoding / display, but the demultiplexer 109 holds the correction value obtained by correcting PCR and the value of PTS / DTS. In response to the PTS / DTS inquiry from the unit 111 / combination unit 114, a value corrected in the same manner as PCR is notified. In the example of FIG. 3, the third MPEG2 TS packet 130 originally has a PTS of 14000, but is similarly corrected in response to the fact that the PCR is corrected based on the above calculation formula. The actual PTS value is 17515 obtained by adding 3515 to 14000.

  By configuring and processing as described above, MPEG2TS and arbitrary data can be multiplexed while maintaining program synchronization information. Also, a plurality of MPEGTS can be multiplexed while maintaining the program synchronization information.

  In the present embodiment, for simplicity, the bit rate of the transmission path 107 is assumed to be the same as the bit rate assumed for each input stream. However, this may not be the case. In that case, it is necessary to first correct the arrival time based on the difference between the bit rate of the transmission path 107 and the bit rate assumed by the stream, but it can be corrected by the method described in this embodiment.

In this embodiment, the number of new packets inserted by the multiplexer 106 is used as it is to correct the packet arrival time. However, the means for correcting the packet arrival time is not limited to this. For example, the calculation result performed on the demultiplexer 109 side described above may be performed on the multiplexer 106 side and described on the packet.
In this case, the packet arrival time correction information is based on, for example, the number of packets inserted between the first MPEG2TS packet 126 and the second MPEG2TS packet 129 with the PCR added to the second MPEG2TS packet 129. The information is corrected based on the information.

Furthermore, what this embodiment shows is an example of the present invention, and does not limit the present invention. The system configuration and the multiplex packet configuration can be changed as long as they are based on the spirit of the present invention.
In the present embodiment, MPEG2TS has been described as an example. However, even if MPEG2PS is used, processing can be performed in the same manner as described above.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing an example of the configuration of the digital broadcast receiving apparatus according to this embodiment.

  In the present embodiment, three MPEG2TSs input from a hard disk in which a recorded program is stored are received by the signal receiving unit, time-division multiplexed, transmitted to the signal processing unit, and the MPEG2TS decoded by the signal processing unit. The output image is synthesized and displayed.

  In FIG. 4, 201 is a hard disk (HDD) for storing digital broadcasts, 202 is a hard disk controller (HDD controller), 203 is a signal receiving unit in this system, and 204 is a TS holding memory for holding TS read from the hard disk. is there. Reference numeral 205 denotes a multiplexer that time-division-multiplexes a plurality of TSs read from the TS holding memory 204 while adding packet arrival time correction information and inter-stream PCR difference information. Reference numeral 207 denotes a signal processing unit in this system, 206 denotes a transmission path for transmitting a signal from the signal receiving unit 203 to the signal processing unit 207, and 208 denotes a demultiplexer that decomposes the time-division multiplexed data multiplexed by the multiplexer 205. A PCR correction unit 209 corrects the system clock based on the packet arrival time correction information and the inter-stream PCR difference information added by the multiplexer 205, and 210 is an MPEG2 decoding unit that decodes various MPEG2 ESs. Reference numeral 211 denotes a synthesizing unit that synthesizes an image output from the MPEG2 decoding unit 210 in the screen, and 212 denotes an image display device (output device) such as a display.

  When the user selects a plurality of MPEG2 TS programs stored in the hard disk 201, a plurality of TSs are input to the signal receiving unit 203 in this system via the HDD controller 202. The signal receiving unit 203 includes a TS holding memory 204 and a multiplexer 205. In the TS holding memory 204, each MPEG2 TS stream input from the hard disk controller 202 is stored. In the present embodiment, three TS holding memories 204 are shown on the assumption that three TSs are input, but this is a schematic diagram and the TS holding memory only needs to have three logical areas.

An example of a packet created by the multiplexer 205 is shown in FIG.
In FIG. 5, regions having the same meaning as in the first embodiment are denoted by the same reference numerals as those in FIG. 2, and detailed description thereof is omitted. Reference numeral 213 denotes a Pcr_Offset_Table_Size area indicating the size of a table added as inter-stream PCR difference information, and reference numeral 214 denotes a Pcr_Offset_Table area indicating inter-stream PCR difference information.

  The actual state of each MPEG2TS is in a payload area 121 to which various headers 116 to 120, a Pcr_Offset_Table_Size area 213, and a Pcr_Offset_Table area 214 are added. In the header information, an Arrival_Revise area 120 is added as packet arrival time correction information. In the present embodiment, the added information is the number of other MPEG2 TS packets inserted between the original MPEG2 TS packets.

  In addition, in the Pcr_Offset_Table area 214, a difference value between PCRs of each MPEG2 TS is added as a table as PCR difference information between streams. In order to determine the size in the packet of the Pcr_Offset_Table area 214, the size of the table is added to the Pcr_Offset_Table_Size area 213.

  The signal multiplexed by the multiplexer 205 is sent to the signal processing unit 207 of the system through the transmission path 206. The bandwidth of the transmission path 206 is arbitrary. The signal processing unit 207 is a processing unit that decodes and outputs a signal group input from the transmission path 206.

  The demultiplexer 208 decomposes the packet multiplexed by the multiplexer 205 and corrects the PCR value indicating the packet arrival time based on the packet arrival time correction information (Arrival_Revision area 120).

  In addition, the demultiplexer 208 sends the PCR value corrected by the packet arrival time correction information of the MPEG2TS, which is a reference for correcting the system clock, selected by the user or the system, to the PCR correction unit 209. The system clock is single, and there is only one stream as a reference for correcting the PCR fluctuation even if there are a plurality of MPEG2TSs.

  The PCR correction unit 209 corrects the PCR fluctuation of the system clock based on the PCR value corrected with the packet arrival time correction information of the TS selected as the reference. PCR reference time correction is also performed here. For a stream not selected as the PCR reference stream, the PCR value is further corrected based on the inter-stream PCR difference information (Pcr_Offset_Table area 214).

  The MPEG2 decoding unit 210 decodes each MPEG2TS and outputs a stream according to the system clock corrected by the PCR correction unit 209. The completed stream is combined by the combining unit 211 and output from the image display device (output device) 212 as a multi-screen.

The operation of the multiplexer 205 and the inter-stream PCR difference information will be specifically described.
The packet multiplexing operation of the multiplexer 205 is the same as that in the first embodiment. Also, the information added for packet decomposition of the demultiplexer 208 is the same as in the first embodiment.

  This embodiment is different from the first embodiment in that there are a plurality of MPEG2TS, that is, a plurality of streams having program synchronization information. Even if there are a plurality of streams having program synchronization information, it is clear that there is only one stream that can reflect the PCR reference time correction and the PCR fluctuation correction in the system clock as long as there is a single system clock. Since the PCR reference time correction and the PCR fluctuation correction are performed on the selected stream, this point is the same as in the first embodiment.

  However, since each stream has a PCR created at a different time, it is necessary to correct it at the same time. The reference stream for correcting at the same time, which is the same as the stream reflecting the PCR fluctuation correction, is selected by the user or the system. The method of selection is not specified. For example, a method may be considered in which a stream occupying the widest area on the currently displayed screen is used as a reference.

  In order to realize this, the multiplexer 205 adds the packet arrival time correction information used in the first embodiment, that is, the number of packets inserted between the original MPEG2TSs to the Arriv_Revision area 120, and at a certain time. Is added to the Pcr_Offset_Table area 214 as an inter-program PCR difference information area. An example of the multiplexed stream created by the multiplexer 205 and the inter-program PCR difference information is as shown in FIG.

  In FIG. 6, 215 is an original MPEG2TS stream-1, 216 is an original MPEG2TS stream-2, 217 is an original MPEG2TS stream-3, 218 is a multiplexed stream according to the present embodiment, and 219 is a first MPEG2TS-1. Packet, 220 is a first MPEG2 TS-2 packet, 221 is a first MPEG2TS-3 packet, 222 is a second MPEG2TS-1 packet, 223 is a second MPEG2TS-2 packet, and 224 is a second MPEG2TS-3 packet Packet 225 is added to the first MPEG2TS-1 packet 219 Pcr_Offset_Table 226 is added to the first MPEG2TS-2 packet 220 Pcr_Offset_Table 227 is the first MPEG2TS-3 packet A Pcr_Offset_Table added to 21.

  Each program PCR difference information has PCR difference information between all streams. This is to prevent the program synchronization information from failing whatever stream the user or system uses as a clock reference.

When the demultiplexer 208 receives a packet including the PCR, the demultiplexer 208 checks whether a stream including the packet is selected as a clock reference. If the stream is selected as a clock reference (clock reference stream), the inter-stream PCR difference information is not used. In this case, as in the first embodiment, the PCR value is corrected by the packet arrival time correction information, and the PCR correction value is notified to the PCR correction unit 209.
On the other hand, if it is not the clock reference stream, first the PCR value is corrected with the packet arrival time correction information, and further, the difference value between the clock reference stream and its own PCR is obtained based on the inter-stream PCR difference information. Correct the value.

  A specific PCR value correction will be described with reference to the example of FIG. When the stream standard is designated as MPEG2TS-1, the MPEG2TS-1 operates in the same manner as in the first embodiment. That is, the arrival_revise area 120 which is packet arrival time correction information indicates that there are two packets in the same way as in the first embodiment. Assuming that the PCR of the first MPEG2TS-1 packet 219 is 10,000, the PCR of the second MPEG2TS is 13000, the packet size is 256 bytes, and the bit rate is 30 Mbps, the PCR value based on the packet arrival time correction information is the same as in the first embodiment. As calculated, it is 13515 (10000 + 3515 = 13515).

  The time correction of MPEG2TS-2 and MPEG2TS-3 when MPEG2TS-1 is selected as the PCR standard is as follows. First, in the Arrival_Revise area which is packet arrival time correction information, both “1” are shown for both the first MPEG2 TS-2 packet 220 and the first MPEG2 TS-3 packet 221, and in the first embodiment, As calculated, the first PCR value is obtained by adding 3515 to each PCR. Furthermore, for MPEG2TS-2, the PCR offset from MPEG2TS-1 is found to be +7700 from Pcr_Offset_Table 226 added to the first MPEG2TS 220, so that addition is performed, and the PCR value after applying the inter-program PCR difference information is 2300, 3515, and 7700 are added (2300 + 3515 + 7700) to obtain 13515. The same calculation is performed for MPEG2TS-3, and the PCR value is 13515. In this example, since the same number of packets are inserted and the PCRs are acquired at the same timing, the corrected PCRs all have the same value, and program synchronization can be achieved.

A method for creating Pcr_Offset_Table, which is PCR difference information between programs, will be described in detail with reference to FIG.
In FIG. 7, 228 is a straight line indicating a system clock value, 229 is a PCR value of the first MPEG2TS-1 packet 219, 230 is a PCR value of the second MPEG2TS-1 packet 222, and 231 is a first MPEG2TS-2 packet. The PCR value of 220, 232 is the PCR value of the second MPEG2 TS-2 packet 223, 233 is the PCR value of the first MPEG2 TS-3 packet 221, and 234 is the PCR value of the second MPEG2 TS-3 packet 224.

  Pcr_Offset_Table indicates the difference in local time of each stream. Therefore, for example, when creating the Pcr_Offset_Table when the PCR value 230 of the second MPEG2TS-1 packet 222 is received, the difference from the MPEG2TS-1 is naturally zero. The difference from MPEG2TS-2 is calculated from the difference between the system clock calculated by the PCR value 231 of the first MPEG2TS-2 packet 220 and the PCR value 230 of the second MPEG2TS-1 packet 222. What is necessary is just to add the difference value with a system clock. A difference value from the MPEG2TS-3 PCR value can be obtained in the same manner. Each time the multiplexer 205 receives the PCR value of each stream, the multiplexer 205 creates Pcr_Offset_Table by performing the above processing.

  With the configuration described above, even when a stream having a plurality of program synchronization information is multiplexed, stream multiplexing can be performed with a simple change without causing a large program synchronization failure.

  In this embodiment, for simplicity, the bit rate of the transmission path 206 is assumed to be the same as the bit rate assumed for each input stream. However, this may not be the case. In that case, it is necessary to first correct the arrival time based on the difference between the bit rate of the transmission path 206 and the bit rate assumed for the stream, but it can be corrected by the method described in this embodiment.

  In this embodiment, the number of new packets inserted by the multiplexer 205 is used as it is to correct the packet arrival time. However, the means for correcting the packet arrival time is not limited to this. For example, the calculation result performed on the demultiplexer 208 side described above may be performed on the multiplexer 205 side and described on the packet.

Furthermore, what this embodiment shows is an example of the present invention, and does not limit the present invention. The system configuration and the multiplex packet configuration can be changed as long as they are based on the spirit of the present invention.
In the present embodiment, MPEG2TS has been described as an example. However, even if MPEG2PS is used instead of MPEG2TS, processing can be performed in the same manner as described above.

(Third embodiment)
The third embodiment of the present invention will be described below with reference to the drawings. FIG. 8 is a block diagram showing an example of the configuration of the digital broadcast receiving apparatus according to the present embodiment.

  In this embodiment, the MPEG2TS input from the tuner, the JPEG input from the digital camera, and the DV stream input from the DV are received by the signal receiving unit, time-division multiplexed and transmitted to the signal processing unit, The signal processing unit decodes MPEG2TS / JPEG / DV and synthesizes and displays the output image.

  In FIG. 8, the same reference numerals as those in FIG. 1 are assigned to the same operations as those in the first embodiment, and the detailed description thereof is omitted. Reference numeral 301 denotes a signal receiving unit in this system, and 302 denotes time-division multiplexing of various data strings input from the digital broadcast receiving tuner 103 and various interfaces 104 and 105, with different SYNC patterns added depending on the type of stream to be multiplexed. It is a multiplexer. Reference numeral 303 denotes a signal processing unit in the present system, and 304 denotes a demultiplexer that decomposes the time-division multiplexed data multiplexed by the multiplexer 302 and counts the number of packets inserted between the original single streams.

  The digital broadcast signal received from the antenna 101, the image signal from the digital camera, and the DV signal from the DVC are received by the signal receiving unit 102 in this system. The signal receiving unit 301 is a processing unit that processes an input signal based on user input, data input, or the like. The signal receiving unit 102 includes a digital broadcast receiving tuner 103, a USB interface 104, and an IEEE 1394 interface 105, and each receives a digital broadcast MPEG2, a JPEG from a digital camera, and a DV stream from a DVC. The received signal is sent to the multiplexer 302 and multiplexed.

  The SYNC pattern is 0x47 in the case of MPEG2TS, and values are determined in advance for any other packets. For example, as shown in FIG. Nothing changes for MPEG2TS packets. When JPEG is multiplexed, as shown in FIG. 10A, the JPEG data is inserted as it is after the SYNC pattern 0x50 indicating JPEG. The same applies to DV. As shown in FIG. 10B, DV data is inserted as it is after the SYNC pattern 0x30 indicating DV.

  The signal multiplexed by the multiplexer 302 is sent to the signal processing unit 303 of the system through the transmission path 107. The bandwidth of the transmission path 107 is arbitrary. The signal processing unit 303 is a processing unit that decodes and outputs a signal group input from the transmission path 107.

  The demultiplexer 304 receives the packet multiplexed by the multiplexer 302 and performs a decomposition process. Further, the demultiplexer 304 calculates a PCR correction value from the PCR information added to the original TS packet, the number of packets inserted between the original TS packets, and the bit rate of the transmission path 107, The data is sent to the PCR correction unit 110. The demultiplexer 304 counts the number of packets inserted between the original TS packets.

  The PCR correction unit 110 corrects the PCR fluctuation of the system clock from the information. PCR reference time correction is also performed here. The MPEG2 decoding unit 111 performs normal MPEG2 decoding, and outputs video and audio based on the system clock corrected by the PCR correction unit 110. The JPEG decoding unit 112 and the DV decoding unit 113 may be general ones. The completed image group is combined by the combining unit 114 and output from the image display device (output device) 115 as a multi-screen.

  The operation of the multiplexer 302 will be specifically described. The multiplexer 302 receives the input from the digital broadcast receiving tuner 103 and the input / output interfaces 104 and 105, and converts the MPEG2TS into the fixed size packet format as shown in FIG. 3 as it is for the JPEG / DV. The packet size must be the same size as MPEG2TS, and is 188 bytes. Each stream body is arranged in the Payload area 305. The packets are arranged in an appropriate order and output from the transmission path 107. The order of the packets may be appropriate. In this embodiment, the packets are arranged in the order input from the digital broadcast receiving tuner 103 and the input / output interfaces 104 and 105. A schematic diagram of multiplexing is shown in FIG.

  In FIG. 11, 306 is an original MPEG2TS stream, 307 is an original JPEG stream, 308 is an original DV stream, 309 is a multiplexed stream generated according to this embodiment, 310 is a first MPEG2TS packet, and 311 is a first MPEG2TS packet. 1 JPEG packet, 312 is a first DV packet, 313 is a second MPEG2TS packet, and 314 is a third MPEG2TS packet.

  The demultiplexer 304 performs time division multiplexing decomposition based on the SYNC pattern added by the multiplexer 302 and counts the number of new packets multiplexed between the original MPEG2TS packets, and based on this, the packet arrival time indicated by the PCR Correct. Specifically, the PCR is corrected from the counted number of packets, packet size, and bit rate to a PCR value obtained by delaying the original arrival time indicated by PCR. The method for correcting the PCR value from the counted number of packets is the same as that described in the first embodiment.

  The PCR fluctuation amount is calculated using the PCR value corrected in the above calculation and the actual arrival time, and the PCR correction unit 110 corrects the PCR fluctuation of the system clock. The correction is also the same as in the first embodiment.

  By configuring and processing in this way, it is possible to multiplex MPEG2TS and arbitrary data while maintaining synchronization information. However, in this embodiment, since the number of newly inserted packets is counted by the demultiplexer 304, a plurality of streams having the same SYNC pattern cannot be multiplexed. However, since MPEG2TS does not perform any operation on the packet, if the demultiplexer 304 does not support time division multiplexing according to this embodiment, it is only necessary to discard a packet having a SYNC pattern other than 0x47. There is an advantage that the original MPEG2TS can be received and decoded.

  In addition, what this Embodiment shows is an example of this invention, and does not limit this invention. The system configuration and the multiplex packet configuration can be changed as long as they are based on the gist of the present invention.

(Fourth embodiment)
The fourth embodiment of the present invention will be described below with reference to the drawings. FIG. 12 is a block diagram showing an example of the configuration of the digital broadcast receiving apparatus according to this embodiment.

  12, components that perform the same operations as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted. 401 is a signal receiving unit in the present system, 402 is a type of stream to be multiplexed and various packets inserted from the digital broadcast receiving tuner 103 and various interfaces 104 and 105 and a packet inserted between the original streams. It is a multiplexer that adds time-division multiplexing by adding different SYNC patterns depending on the number. Reference numeral 403 denotes a signal processing unit in this system, and reference numeral 404 denotes a demultiplexer that decomposes the time-division multiplexed data multiplexed by the multiplexer 402.

  This embodiment differs from the third embodiment in that the SYNC pattern is not defined in advance, the multiplexer 201 creates a correspondence table of the SYNC pattern and multiplexes it into the stream, and the multiplexer 412 newly The point is that the SYNC pattern has information on the number of multiplexed packets. Other forms are the same as in the third embodiment.

The SYNC pattern added by the multiplexer 402 and operations of the demultiplexer 404 and the PCR correction unit 110 based on the SYNC pattern will be described more specifically.
The SYNC pattern added by the multiplexer 402 has information added so that the information multiplexed by the demultiplexer 404 can be decomposed and information added as packet arrival time correction information. FIG. 13 shows a SYNC pattern. Information to be added so that the multiplexed information can be decomposed is added to the upper 4 bits of the SYNC pattern, and the number of newly inserted packets is added to the lower 4 bits of the SYNC pattern as information for correcting the arrival time of the packet. .

  Information added to the upper 4 bits of the SYNC pattern is information indicating the type of stream. In this embodiment, in order to express various streams in 4 bits, a SYNC pattern correspondence table is multiplexed on a packet of the SYNC pattern 0x11. In this embodiment, the SYNC pattern packet that multiplexes the SYNC pattern correspondence table is set to 0x11. However, the multiplexed pattern is not limited to this as long as the multiplexer 404 and the multiplexer 404 can recognize in common. Good.

  The SYNC pattern correspondence table is multiplexed at regular time intervals. An example of the correspondence table of SYNC patterns is shown in FIG. The information added to the lower 4 bits of the SYNC pattern is the number of newly multiplexed packets inserted between the original MPEG2 TS packets. In the example of FIG. 11, the first MPEG2 TS packet 310 and the second MPEG2 TS packet 313 are continuous packets on the original MPEG2 TS stream 306, but in the multiplexer 402, the first JPEG packet 311, Since one DV packet 312 is inserted, a numerical value “2” is added to the lower 4 bits of the SYNC pattern in the second MPEG2TS packet 313.

  First, the demultiplexer 404 performs demultiplexing based on the demultiplexing information added by the multiplexer 402. The demultiplexer first waits until a 0x11 packet is received, and obtains a SYNC pattern correspondence table. After acquiring the SYNC pattern correspondence table, demultiplexing of multiple streams is performed based on the information specified in the correspondence table.

  Next, the demultiplexer 404 corrects the packet arrival time indicated by the PCR based on the packet arrival time correction information. Specifically, the PCR value is corrected to the PCR value obtained by delaying the original arrival time indicated by the PCR from the value, packet size, and bit rate indicated by the lower 4 bits of the SYNC packet. The calculation formula for correction is the same as that in the first embodiment.

  The PCR fluctuation amount is calculated using the PCR value corrected by the packet arrival time correction information and the actual arrival time, and the PCR correction unit 110 corrects the PCR fluctuation of the system clock. PCR reference time correction is also performed here. The correction method is the same as that in the first embodiment.

  By configuring and processing in this way, it is possible to multiplex MPEG2TS and arbitrary data while maintaining synchronization information.

  In addition, what this Embodiment shows is an example of this invention, and does not limit this invention. The system configuration and the multiplex packet configuration can be changed as long as they are based on the gist of the present invention.

(Fifth embodiment)
Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 15 is a block diagram showing an example of the configuration of the digital broadcast receiving apparatus according to the present embodiment.

  In this embodiment, the MPEG2TS input from the tuner, the MPEG2TS input from the hard disk in which the recorded program is stored, and the DV stream input from the DV are received by the signal receiving unit and time-division multiplexed. Are transmitted to the signal processing unit, the MPEG2TS • DV is decoded by the signal processing unit, and the output image is synthesized and displayed.

15, regions having the same meaning as in the first embodiment are denoted by the same reference numerals as those in FIG. 2, and detailed description thereof is omitted. In addition, the same reference numerals as those in FIG. 4 are given to regions having the same meaning as in the second embodiment, and detailed description thereof is omitted.
In FIG. 15, 501 is a signal receiving unit in this system, 502 is a broadcast wave MPEG2TS inputted from the antenna 101, an accumulated MPEG2TS read from the TS holding memory 204, and a DV stream inputted from IEEE1394, and packet arrival time correction information And a multiplexer that performs time-division multiplexing while adding inter-stream PCR difference information. Reference numeral 503 denotes a signal processing unit in this system, and reference numeral 504 denotes a demultiplexer that decomposes the time-division multiplexed data multiplexed by the multiplexer 502.

  A digital broadcast signal received by the antenna 101, a stored broadcast signal input from the hard disk 201 via the HDD controller 202, and a DV signal from a DVC (Digital Video Camera) are input to the signal receiving unit 501 in this system. The The signal receiving unit 501 includes a digital broadcast receiving tuner 103, an IEEE 1394 interface 105, and a TS holding memory 204, which respectively receive digital broadcast MPEG2, DV stream from DVC, and stored MPEG2 from the hard disk. In the present embodiment, it is assumed that two TS inputs of a broadcast wave TS input from an antenna, a storage TS input from a storage medium, and one DV stream from a DVC are input simultaneously. . The received signal is sent to the multiplexer 502 and multiplexed.

The packet created by the multiplexer 502 is the same packet as in the second embodiment and is shown in FIG.
That is, also in the present embodiment, the actual state of the two MPEG2TSs and the actual state of the DV stream enter the payload area 121, and various headers 116 to 120, a Pcr_Offset_Table_Size area 213, and a Pcr_Offset_Table area 214 are added thereto. It becomes. In the header information, an Arrival_Revise area 120 is added as packet arrival time correction information. In the present embodiment, the information to be added is the number of the other MPEG2TS packets and the number of DV packets inserted between the original MPEG2TS packets.

  Similarly to the second embodiment, the Pcr_Offset_Table area 214 adds, as a table, a difference value between PCRs of two MPEG2 TSs as PCR difference information between streams. In order to determine the size in the packet of the Pcr_Offset_Table area 214, the size of the table is added to the Pcr_Offset_Table_Size area 213.

  The signal multiplexed by the multiplexer 502 is sent to the signal processing unit 503 of the system through the transmission path 107. The bandwidth of the transmission path 107 is arbitrary. The signal processing unit 503 is a processing unit that decodes and outputs a signal group input from the transmission path 107.

  The demultiplexer 504 decomposes the packet multiplexed by the multiplexer 502 and corrects the PCR value indicating the packet arrival time based on the packet arrival time correction information (Arrival_Revision area 120).

  Further, the demultiplexer 504 sends the PCR value corrected by the packet arrival time correction information of the MPEG2 TS, which is selected by the user or the system and serves as a reference for correcting the system clock, to the PCR correction unit 209. The system clock is single, and even if there are a plurality of MPEG2TSs, there is only one stream as a reference for PCR fluctuation correction, which is the same as in the second embodiment.

  The operation of the DV decoding unit 113 is the same as that of the first embodiment, and the PCR correction unit 209 and the MPEG2 decoding unit 210 are the same as those of the second embodiment. The stream obtained as a result of the decoding process is combined by the combining unit 114 and output from the image display device (output device) 115 as a multi-screen.

The operation of the multiplexer 502 and the inter-stream PCR difference information will be specifically described.
The packet multiplexing operation of the multiplexer 502 is the same as in the first and second embodiments. Also, the information added for the packet decomposition of the demultiplexer 504 is the same as in the first and second embodiments.

  This embodiment is different from the first and second embodiments in that there are a plurality of MPEG2TS, that is, a plurality of streams having program synchronization information, and DV streams having no synchronization information are simultaneously multiplexed.

  As already described in the second embodiment, since two MPEG2 TS streams have PCRs created at different times, a stream serving as a reference for correction is selected and processing for adjusting the stream time is performed.

  The actual operation of the multiplexer 502 is a combination of the processing performed in the first embodiment and the second embodiment. The other MPEG2 TS and DV packet numbers are used as packet arrival time correction information. An example of the multiplexed stream created by the multiplexer 502 and the inter-program PCR difference information is as shown in FIG.

  In FIG. 16, 505 is the original broadcast MPEG2 TS-1 stream, 506 is the original stored MPEG2 TS-2 stream, 507 is the original DV stream, 508 is the multiplexed stream according to the present embodiment, and 509 is the first broadcast. Wave MPEG2TS-1 packet, 510 is the first accumulated MPEG2TS packet-2, 511 is the first DV packet, 512 is the second broadcast wave MPEG2TS-1 packet, 513 is the second accumulated MPEG2TS-2 packet, 514 The second DV packet 515 is a Pcr_Offset_Table added to the first broadcast wave MPEG2 TS-1 packet 509, and 516 is a Pcr_Offset_Table added to the first stored MPEG2 TS-2 packet 510.

  Each program PCR difference information has PCR difference information between two MPEG2 TS streams. This is to prevent the program synchronization information from failing regardless of which stream the user or system uses as the clock reference.

  The demultiplexer 504 determines from the information in the STREAM_TYPE area 118 whether the packet includes program synchronization information. In the case of a packet containing program synchronization information, it is next checked whether the stream containing the packet is selected as the clock reference. If the stream is selected as a clock reference (clock reference stream), the inter-stream PCR difference information is not used. In this case, as in the first and second embodiments, the PCR value is corrected based on the packet arrival time correction information, and the PCR correction value is notified to the PCR correction unit 209.

  The operation when the stream type indicated in the STREAM_TYPE area 118 is a stream including program synchronization information and is not a clock reference stream has been described in the second embodiment. In other words, first the PCR value is corrected with the packet arrival time correction information, and then, based on the inter-stream PCR difference information, the difference value between the clock reference stream and its own PCR is acquired, and the PCR value is further corrected. is there.

  When the stream type indicated in the STREAM_TYPE area 118 is a stream that does not include program synchronization information, which is a DV stream in this embodiment, only the payload 121 is output to the DV decoding unit 113.

  With reference to the example of FIG. 16, a specific PCR value correction will be described. When the stream standard is designated as the broadcast wave MPEG2TS-1, the broadcast wave MPEG2TS-1 operates in the same manner as in the first embodiment. That is, the arrival_revise area 120 which is packet arrival time correction information indicates that there are two packets in the same way as in the first embodiment. Assuming that the PCR of the first MPEG2TS-1 packet 219 is 10,000, the PCR of the second MPEG2TS is 13000, the packet size is 256 bytes, and the bit rate is 30 Mbps, the PCR value according to the packet arrival time correction information is the first PCR value. As calculated in the embodiment, 13515 (10000 + 3515 = 13515) is obtained.

  The time correction of the stored MPEG2TS-2 when the broadcast wave MPEG2TS-1 is selected as the PCR standard is the same as in the second embodiment. That is, first, in the Arrival_Revise area 120 that is the packet arrival time correction information, the first broadcast wave MPEG2 TS packet 509 and the first DV stream packet 511 are inserted into the first stored MPEG2 TS-2 packet 510. “2” is shown, and as calculated in the first embodiment, a value obtained by adding 3515 to the PCR is the first PCR value. Further, the Pcr_Offset_Table 515 added to the first stored MPEG2TS-2 packet 510 indicates that the PCR offset from the broadcast wave MPEG2TS-1 is +7700. Therefore, the addition is performed and the PCR value after applying the inter-program PCR difference information is 2300, 3515, and 7700 are added (2300 + 3515 + 7700) to obtain 13515.

Since the method for creating Pcr_Offset_Table, which is the inter-program PCR difference information, is also the same as in the second embodiment, the description thereof is omitted.
In addition, what this Embodiment shows is an example of this invention, and does not limit this invention. The system configuration and the multiplex packet configuration can be changed as long as they are based on the gist of the present invention.
In the present embodiment, MPEG2TS has been described as an example. However, even if MPEG2PS is used instead of MPEG2TS, processing can be performed in the same manner as described above.

(Other embodiments of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, program codes of software for realizing the functions of the above-described embodiments are provided to an apparatus or a computer in the system connected to the various devices. What is implemented by operating the various devices according to a program supplied and stored in a computer (CPU or MPU) of the system or apparatus is also included in the scope of the present invention.

  Further, in this case, the program code of the software itself realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code is stored. The recorded medium constitutes the present invention. As a recording medium for storing the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software in which the program code is running on the computer, etc. It goes without saying that the program code is also included in the embodiment of the present invention even when the functions of the above-described embodiment are realized in cooperation with the embodiment.

  Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function expansion unit based on the instruction of the program code Needless to say, the present invention includes a case where the functions of the above-described embodiment are realized by performing part or all of the actual processing.

1 is a block diagram illustrating an example of a configuration of a digital broadcast receiving device according to a first embodiment of this invention. FIG. FIG. 5 is a schematic diagram illustrating an example of a multiplexed packet created by a multiplexer according to the first embodiment of this invention. FIG. 3 is a schematic diagram illustrating an example of a multiplexed packet sequence created by a multiplexer according to the first embodiment of this invention. It is a block diagram which shows the 2nd Embodiment of this invention and shows an example of a structure of a digital broadcast receiver. It is a schematic diagram which shows the 2nd Embodiment of this invention and shows the example of the form of the multiplexed packet which a multiplexer produces. It is a schematic diagram which shows the 2nd Embodiment of this invention and shows the addition form of the form of the multiplexed packet sequence which a multiplexer produces, and 2nd PCR correction information. It is a schematic diagram which shows the 2nd Embodiment of this invention and shows an example of the production method of Pcr_Offset_Table. It is a block diagram which shows the 3rd Embodiment of this invention and shows an example of a structure of a digital broadcast receiver. It is a figure which shows the 3rd Embodiment of this invention and shows an example of the SYNC pattern added with a multiplexer. It is a figure which shows the 3rd Embodiment of this invention and shows an example of the form of the packet which a multiplexer produces. It is a schematic diagram which shows the 3rd Embodiment of this invention and shows the example of the form of the multiplexed packet sequence which a multiplexer produces. It is a block diagram which shows the 4th Embodiment of this invention and shows an example of a structure of a digital broadcast receiver. It is a figure which shows the 4th Embodiment of this invention and shows an example of the SYNC pattern which a multiplexer adds. It is a figure which shows the 4th Embodiment of this invention and shows an example of the correspondence table of the SYNC pattern which a multiplexer produces. It is a block diagram which shows the 5th Embodiment of this invention and shows an example of a structure of a digital broadcast receiver. It is a schematic diagram which shows the 5th Embodiment of this invention and shows the example of the multiplexed packet which a multiplexer produces.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Antenna 102 Signal receiving part 103 Digital broadcast receiving tuner 104 USB interface 105 IEEE1394 interface 106 Multiplexer 107 Transmission path 108 Signal processing part 109 Demultiplexer 110 PCR correction part 111 MPEG2 decoding part 112 JPEG decoding part 113 DV decoding part 114 Composition part 115 Image Display device 116 SYNC area 117 Arrival_Revise_Flag area 118 Stream_Type area 119 Stream_Id area 120 Arrival_Revise area 121 Payload area 122 Original MPEG2 TS stream 123 Original JPEG stream 124 Original DV stream 125 Original DV stream 125 EG packet 128 First DV packet 129 Second MPEG2 TS packet 130 Third MPEG2 TS packet 201 Hard disk 202 Hard disk controller 203 Signal input unit 204 TS holding memory 205 Multiplexer 206 Transmission path 207 Signal processing unit 208 Demultiplexer 209 PCR correction unit 210 MPEG2 decoding unit 211 Compositing unit 212 Image display device 213 Pcr_Offset_Table_Size area 214 Pcr_Offset_Table area 215 Original MPEG2TS-1 stream 216 Original MPEG2TS-2 stream 217 Original MPEG2TS-3 stream 218 Multiplexed stream 219 First MPEG2TS-1 packet 220 First MPEG2 TS-2 packet 221 1st MPEG2TS-3 packet 222 2nd MPEG2TS-1 packet 223 2nd MPEG2TS-2 packet 224 2nd MPEG2TS-3 packet 225-227 Pcr_Offset_Table
228 System clock 229 PCR value 230 of the first MPEG2 TS-1 packet PCR value 231 of the second MPEG2 TS-1 packet PCR value 232 of the first MPEG2 TS-2 packet PCR value 233 of the second MPEG2 TS-2 packet MPEG2 TS-3 packet PCR value 234 Second MPEG2 TS-3 packet PCR value 301 Signal receiving unit 302 Multiplexer 303 Signal processing unit 304 Demultiplexer 305 Packet payload 306 created by the multiplexer Original MPEG2 TS stream 307 Original JPEG stream 308 Original DV stream 309 Multiplexed stream 310 First MPEG2 TS packet 311 First JPEG packet 312 First DV packet 313 Second MPE 2TS packet 314 Third MPEG2TS packet 401 Signal receiving unit 402 Multiplexer 403 Signal processing unit 404 Demultiplexer 501 Signal receiving unit 502 Multiplexer 503 Signal processing unit 504 Demultiplexer 505 Original broadcast wave MPEG2 TS-1 stream 506 Original accumulation MPEG2TS- 2 stream 507 Original DV stream 508 Multiplexed stream 509 First broadcast wave MPEG2 TS-1 packet 510 First accumulated MPEG2 TS packet-2
511 First DV packet 512 Second broadcast wave MPEG2 TS-1 packet 513 Second stored MPEG2 TS-2 packet 514 Second DV packet 515, 516 Pcr_Offset_Table

Claims (5)

A plurality of MPEG2 transport streams and a plurality of arbitrary data are divided into 188 bytes which are the data packet size of the MPEG2 transport stream, and the SYNC pattern of the MPEG2 transport stream is divided for each content of the packet to be multiplexed. A multiplexer that changes and adds different patterns to create a multiplexed stream;
A demultiplexer for separating the multiplexed stream created by the multiplexer,
The SYNC pattern that differs depending on the content of the packet to be multiplexed is a pattern obtained by adding the number of packets of the arbitrary data inserted between the MPEG2 transport streams to a predetermined pattern indicating each stream. A digital data receiving device. A digital broadcast receiving tuner for inputting the plurality of MPEG2 transport streams;
An input / output interface for inputting the plurality of arbitrary data,
2. The digital data receiving apparatus according to claim 1, wherein the multiplexer receives the plurality of MPEG2 transport streams from the digital broadcast receiving tuner and receives the plurality of arbitrary data from the input / output interface.   The demultiplexer counts the number of packets of the arbitrary data newly inserted between packets of the MPEG2 transport stream, and the PCR added to the MPEG2 transport stream based on the counted number of packets The digital data receiver according to claim 1, wherein the digital data receiver is corrected. A plurality of MPEG2 transport streams and a plurality of arbitrary data are divided into 188 bytes which are the data packet size of the MPEG2 transport stream, and the SYNC pattern of the MPEG2 transport stream is divided for each content of the packet to be multiplexed. A multiplexed stream creation step for creating a multiplexed stream by changing and adding different patterns,
A multiplexed stream separating step for separating the multiplexed stream created by the multiplexed stream creating step;
The SYNC pattern that differs depending on the content of the packet to be multiplexed is a pattern obtained by adding the number of packets of the arbitrary data inserted between the MPEG2 transport streams to a predetermined pattern indicating each stream. A method of receiving digital data. A plurality of MPEG2 transport streams and a plurality of arbitrary data are divided into 188 bytes which are the data packet size of the MPEG2 transport stream, and the SYNC pattern of the MPEG2 transport stream is divided for each content of the packet to be multiplexed. A multiplexed stream creation step for creating a multiplexed stream by changing and adding different patterns,
Causing the computer to execute a multiplexed stream separation step of separating the multiplexed stream created by the multiplexed stream creation step;
The SYNC pattern that differs depending on the content of the packet to be multiplexed is a pattern obtained by adding the number of packets of the arbitrary data inserted between the MPEG2 transport streams to a predetermined pattern indicating each stream. A computer program characterized by the above.

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