JP2001217719A - Data transmitter, data receiver and data transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the serial data streams of different formats. SOLUTION: This system is provided with an SDI/SDTI decoder 52 for identifying whether the serial data stream received from the data transmitter is an SDTICP data stream or SDI data stream, an MPEG decoder 42 for performing decoding processing concerning the SDTICP data stream, and a display switch part 43 for switching and outputting the SDI data stream and the decoded SDTICP data stream based on the identified result of the SDI/SDTI decoder 52. An image based on the SDI data stream and an image based on the SDTICP data stream are displayed on a display part 45 while being switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data transmitting apparatus, a data receiving apparatus, and a data transmission system for transmitting a compressed data stream and an uncompressed data stream.

[0002]

2. Description of the Related Art At present, in the broadcasting industry, SDI (Serial D)
A digital transmission format using a coaxial cable called an “igital Interface” standard has become widespread. The SDI standard is a transmission format for transmitting digital data by connecting devices used in, for example, broadcasting stations with a transmission cable, and is an SMPTE (Society of M
otion Picture and Television Engineers). This SDI standard
It is intended to transmit uncompressed digital data, and includes a luminance signal (Y), a color difference signal (Cr), and a color difference signal (C
Uncompressed image data having a ratio b) of 4: 2: 2 can be transmitted for about 200 m.

As a digital data transmission format, SDTI (Serial Digital Transfer Interface) is used.
e) The standard (SMPTE-305M) is known. The SDTI standard is a digital data transmission format that can transmit not only uncompressed image data but also various data. This SDTI standard conforms to the SDI
While the standard does not specify the transmission of compressed data,
Compressed data can be transmitted. Such SDT
In the I standard, a standard corresponding to the type of data to be transmitted has been created, and SDTI-CP is a digital transmission format for transmitting compressed data according to the MPEG system.
(Content Package) standard is known (SMPTE
326M).

The SDTI-CP standard is a standard that further restricts the packet configuration specified by the SDTI standard, and mainly specifies the configuration of a payload portion for inserting various data. This SDTI-CP standard uses an infrastructure based on the widely used SDI standard,
It specifies that video data, audio data, additional data, and the like compressed according to the MPEG standard be transmitted.

Therefore, the SDI standard, the SDTI standard,
The SDTI-CP standard specifies a digital data transmission format using the same mechanism.

[0006]

SUMMARY OF THE INVENTION The SDTI standard and S
Since digital data transmitted according to the DTI-CP standard has been subjected to compression processing, it is necessary for the data receiving device to perform decoding processing to grasp the contents of video and audio. VTR (Vi) which processes conventional compressed digital data
Data receiving devices such as deo Tape Recorder) and servers cannot perform decoding and other processing even if a data stream with a bit rate higher than the processing rate of recording processing is input, and observe the contents of the data stream. Often cannot. That is, for example, the data receiving device only supports the 1 × speed, but when the data transmitting device transmits at a rate of 1 × or higher, the data receiving device monitors the contents of the data stream. It is difficult to do.

When the data transmitting device is performing high-speed reproduction (searching), the data stream is often not transmitted from the data transmitting device to the data receiving device. This is because when high-speed playback is performed on the data transmission device, only part of the data stream is often played back, and the data reception device uses only a part of the data stream to receive and display. Is difficult.

[0008] That is, for example, if the data receiving device is AV
If the server is a VTR device and the data transmission device is a VTR device, it is necessary to refer to the data recorded in the VTR device when determining the range of duplicating the data recorded in the VTR device in the AV server. At this time, it is necessary to perform the search not only at the normal speed of 1 × speed but also at a high speed such as fast forward or fast rewind by the VTR device.
In the VTR device, when uncompressed data is reproduced at high speed, the data is transmitted in a form that can be displayed on the AV server side.
On the other hand, when the compressed data is reproduced at a high speed, the data recorded on the tape can be reproduced only partially in a discrete manner. Therefore, when the compressed data is reproduced at a high speed, the discrete data is directly converted to the VT data.
If the data is transmitted from the R device to the AV server, the AV server may not be able to decode the data. Therefore, compressed data is often not transmitted during special reproduction such as search. Therefore, the image being searched cannot be displayed on the receiving AV server. Therefore, it is impossible for the data receiving side to perform editing processing and the like with reference to the display device connected to the data receiving side device.

Furthermore, a data stream at a speed that cannot be processed by the data receiving device cannot be displayed by the data receiving device, and the image on the receiving side may be interrupted during shuttle or the like.

The present invention has been proposed in view of the above situation, and provides a data transmission device, a data reception device, and a data transmission system capable of transmitting data streams of different formats. With the goal.

[0011]

In order to solve the above-mentioned problems, a data transmitting apparatus according to the present invention receives compressed data and / or uncompressed data, and switches between compressed data and non-compressed data to output. Switching means, adding header data including data identification information for identifying compressed data or uncompressed data to the data from the switching means,
Packet generating means for generating packet data of a predetermined format composed of header data and compressed data or packet data of a format different from the predetermined format composed of header data and uncompressed data; and packet data generated by the packet generating means. Transmission means for serially transmitting packet data.

According to another aspect of the present invention, there is provided a data receiving apparatus for identifying a received serial data stream as a compressed serial data stream or an uncompressed data stream. Data processing means for performing predetermined data processing on the compressed serial data stream; and the uncompressed serial data stream and the serial data stream subjected to predetermined data processing by the data processing means based on the identification result of the identification means. And switching means for switching and outputting.

Further, in order to solve the above-mentioned problems, a data receiving apparatus according to the present invention includes an identification unit for identifying whether a received serial data stream is a compressed serial data stream or an uncompressed serial data stream; A data processing means for performing predetermined data processing on the compressed serial data stream; a data processing storage means for storing a compressed serial data stream subjected to predetermined data processing by the data processing means; Switching output means for switching and outputting between the uncompressed serial data stream and the serial data stream subjected to predetermined data processing by the data processing means based on the identification result of the means and the processing timing of the data processing means. .

Further, in order to solve the above-mentioned problems, a data transmission system according to the present invention comprises: a data transmission device for serially transmitting a compressed serial data stream or an uncompressed serial data stream to a data receiving destination; Identification means for identifying whether the serial data stream from the data transmitting device is a compressed serial data stream or an uncompressed serial data stream; data processing means for performing predetermined data processing on the compressed serial data stream; A data receiving device including a switching unit that switches and outputs the uncompressed serial data stream and the serial data stream that has been subjected to predetermined data processing by the data processing unit based on the identification result of the identification unit.

Further, in order to solve the above-mentioned problems, a data transmission system according to the present invention comprises: a data transmission device for serially transmitting a compressed serial data stream or an uncompressed serial data stream to a data receiving destination; Identification means for identifying whether the compressed serial data stream is a compressed serial data stream or an uncompressed serial data stream; data processing means for performing predetermined data processing on the compressed serial data stream; and A data processing storage unit in which a compressed serial data stream to be subjected to predetermined data processing is stored; and the uncompressed serial data stream based on the identification result of the identification unit and the processing timing of the data processing unit. Predetermined data by data processing means Treatment provided in the data receiving apparatus and a switching output means for outputting switching between serial data stream, the.

[0016]

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

According to the present invention, for example, a data transmitting apparatus 10 as shown in FIG.
The present invention is applied to a data transmission system that transmits a data stream. Here, the data transmission device 10 is, for example, a VTR device that records video data captured by a camera device, the data reception device 20 is an AV server, and the data transmission device 10 and the data reception device 20 are connected by a transmission cable or the like. Are connected via a transmission medium. In such a data transmission system, an image captured by a VTR device is transmitted to an AV server, and the AV server manages video data captured by the VTR device.

Data transmission between the data transmitting apparatus 10 and the data receiving apparatus 20 is performed by SMPTE (Societe
SDI (Serial Dig) standardized by y of Motion Picture and Television Engineers
ital Interface) standard or SDTI-CP (Serial Dig)
It is performed in accordance with the standard of “Ital Transfer Interface-Content Package”.

First, the data structure of data transmitted in accordance with the SDI standard (hereinafter referred to as SDI data) will be described.

FIG. 3 shows the data structure of the SDI data.
According to FIG. 3, the end synchronization code area (EAV
(End of Active Video)), ancillary area (AN
C), start synchronous code area (SAV (Start of Active Vi
deo)) and the active video area.

The end synchronization code area stores a synchronization code indicating the end of the active video area.

The ancillary area has a data structure similar to the data structure of data transmitted as header data substantially according to the SDTI standard described later. The ancillary area stores header data, auxiliary data, and the like. The ancillary area stores audio data. The data structure of the ancillary area in the SDI standard will be described later.

In the start synchronization code area, a synchronization code indicating the start of the active video area is stored.

The active video area stores uncompressed video data. In this active video area,
Video data for each line of one frame of video is stored. The active video area is configured as shown in FIG. 4, and includes, from the top, a data type information area in which data type information (Type) indicating the type of data to be stored is stored, and a data area.

Next, the data structure of SDTICP data transmitted according to the SDTICP standard will be described.

FIG. 5 shows the data structure of the SDTICP data. According to FIG. 5, the end synchronization code area (E
AV), an ancillary area (ANC), a start synchronization code area (SAV), and a payload area.

The end synchronization code area and the start synchronization code area are:
Information similar to the SDI standard described above is stored.

The ancillary area contains 53 words (1
(Word: 10 bits) is stored. In this ancillary area, as shown in FIG. 6, an auxiliary signal flag (ADF (Ancillary Data
g)), first data ID information (DID (Data ID)),
One word of second data ID information (SDID (Secondar
y Data ID), data amount information (Data Count), line number information (Line Number 0, Line Number 1), error correction information for line number (LN CRC), stream identification information (Code & AAI), destination Address information (Destination
Address), source address information (Source Address),
Block type information (Block Type), error correction code position information (CRC Flag), data extension flag (Data Extension flag)
Flag), header error correction information (Header CRC), and checksum (Check sum). Among them, the auxiliary signal flag, the data ID, the data count, and the checksum conform to the SDI (Serial Digital Interface) standardized by SMPTE-259M.

The auxiliary signal flag (ADF (Ancillary
Data Flag)) is composed of 3-word code data indicating the start of the assembler data. This auxiliary signal flag has a value of “000”, “3FF”, “3F” in hexadecimal notation.
F ".

The first data ID information (DID (Data I
D)), second data ID information (SDID (Secondary D
ata ID)) is “14” in hexadecimal notation.
0h "and" 101h ".

The data amount information (Data Count) is the actual header data length, that is, the auxiliary signal flag, data I
D, the data length of the portion excluding the data count and the checksum are shown. Specifically, it is expressed as "22Eh" in hexadecimal notation indicating 46 words.

The line number information (Line Number) consists of data indicating the line number in the frame.

Line number error correction information (LN CR
C) consists of an error correction code for line number information.

The stream identification information (Code & AAI) contains a code (4) indicating the type of data stored in the payload area.
Bit) and AAI (3 bits) indicating the format of destination address information and source address information. The stream identification information includes information indicating whether the payload area is compressed data or uncompressed data.

Destination address information (Destination Addres
s) indicates an address of a destination to which data is transmitted, and transmission source address information (Source Address) indicates an address of a transmission source which transmits data.

The block type information (Block Type) includes data indicating a method of dividing data stored in the payload area. This block type information is, specifically,
The upper 2 bits indicate whether the payload has a fixed length or a variable length, and also specifies whether an ECC (Error Correction Code) is present, and the lower 6 bits indicate the number of data blocks stored in the payload area.

The error correction code position information (CRC Flag) is for identifying whether or not a CRC is added to the payload area. When the CRC is added to the end of the payload area, it has a value of: "101h" in hexadecimal
When the CRC is not added to the payload part, the value is expressed as “100h” in hexadecimal.

The data extension flag (Data Extension Flag)
g) identifies whether or not there is data in the spare auxiliary data. If there is no data in the spare spare data, the default value is “200” in hexadecimal notation.
h ”is stored.

The header error correction information (Header CRC) covers all 10-bit widths from the code to the extension spare data, and the value is undefined for extension. The generator polynomial for this header error detection code is the same as the line number error detection code.

The checksum is used for error detection by the checksum of the frame data.

The payload area stores video data compressed by the MPEG system for each line. This payload area is configured as shown in FIG. 7, and includes, from the beginning, a data start information area (Separater) in which a data start code indicating the start of the data block is stored, and data type information indicating the type of data of the data block. Data type information area (Type) to be stored, data length information area (Wo
rd count), a data area where the data block is stored (Data Block), and a data end information area (End Code) where the data end code indicating the end of the data block is stored.

As shown in FIG. 1, the data transmission device 10 includes a data processing unit 11, a data transmission processing unit 12, and a transmission control unit 13.

The data processing section 11 performs predetermined signal processing on image data and audio data recorded on a recording medium. The data processing unit 11 performs predetermined signal processing, and outputs uncompressed data S1 that has not been subjected to compression processing to the data transmission processing unit 12 or compressed data S2 that has been subjected to compression processing to the data transmission processing unit 12. I do. This data processing unit 11
Generates compressed data S2 by performing compression processing on image data using, for example, the MPEG method.

The data transmission processing section 12 includes a packing processing section 31, a switch section 32, and an SDI / SDTICP encoder 33. This data transmission processing unit 12
, Uncompressed data S1 or compressed data S2 is input from the data processing unit 11.

The packing processing unit 31 performs a packing process for adding a pack header or the like to the compressed data compressed by the MPEG system in accordance with the SDTICP format described later. The packing processing unit 31 outputs the packed compressed data S2 to the switch unit 32.

The switch 32 receives the uncompressed data S1 from the data processor 11 and the compressed data S2 from the packing processor 31. The switch unit 32 converts uncompressed data or compressed data into SDI / SDTIC based on a switching control signal S3 from the transmission control unit 13.
The output is switched to the P encoder 33.

The SDI / SDTICP encoder 33
Uncompressed data or compressed data is input from the switch unit 32, and information and control signals required for encoding are input from the transmission control unit 13.

This SDI / SDTICP encoder 33
3 uses the uncompressed data from the switch unit 32 and the information from the transmission control unit 13 based on a control signal to generate SDI data according to the SDI standard, and uses the SDI of the data structure shown in FIG. Create data.

Further, the SDI / SDTICP encoder 33 switches the switch section 32 based on a control signal for generating SDTICP data in accordance with the SDTICP standard.
SDTICP having the data structure as shown in FIG.
Create data.

The SDI / SDTICP encoder 33
When creating SDI data and SDTICP data,
The data receiving device 20 adds a timing signal for receiving and interpreting data conforming to the SDI standard and SDTICP standard.

This SDI / SDTICP encoder 33
When the SDI data is generated, the switch unit 32
Then, data type information indicating that the non-compressed data is stored in the active video area is added to the head of the non-compressed data from to generate an active video area. Next, the SDI / SDTICP encoder 33 adds a start synchronization code area (SAV) to the head of the active video area, and adds header data and auxiliary data to the ancillary area. Further, the SDI / SDTICP encoder 33 places an end synchronization code area (E
AV).

At this time, the SDI / SDTICP encoder 33 stores stream identification information indicating that the data is SDI data in the ancillary area as header data. Next, the SDI / SDTICP encoder 33 stores audio data accompanying uncompressed data indicating an image in the ancillary area. Thereby, SDI / SDTICP
The encoder 33 generates stream data composed of SDI data (hereinafter, referred to as an SDI stream),
The SDI stream is serially transmitted from the stream transmission terminal 34.

The SDI / SDTICP encoder 3
3 indicates that when generating SDTICP data, when a system item (System Item) or an auxiliary item (Auxiliary Item) is input from the transmission control unit 13,
Create a payload area that stores system items or auxiliary items. When the SDI / SDTICP encoder 33 receives compressed data indicating a compressed image from the switch unit 32, the SDI / SDTICP encoder 33 stores the compressed data as a picture item in the payload area.
The SDI / SDTICP encoder 33 includes a switch unit 3
When the compressed audio data is input from step 2, the audio data is stored in the payload area as an audio item.

Next, the SDI / SDTICP encoder 33 adds a data end code, data length information, data type information, and data start information to the head of the data area, and adds data end information to the end of the compressed data. , Create the data to be stored in the payload area.
Here, the information added to the compressed data by the SDI / SDTICP encoder 33 is input from the transmission control unit 13, and information indicating that the data compressed by the MPEG method is stored in the data area is added as data type information. Next, the SDI / SDTICP encoder 33
A start synchronization code area (SAV) is added to the beginning of the payload area, and header data and auxiliary data are added to the ancillary area. At this time, the SDI / SDTICP encoder 33 stores the stream identification information indicating that the data is the SDDICP data in the ancillary area as the header data. Thus, the SDI / SDTICP encoder 33
Stream data composed of DTICP data (hereinafter, S
Called DTICP stream. ) Is generated, and the SDTICP stream is serially transmitted from the stream transmission terminal 34.

The transmission control unit 13 includes a data transmission processing unit 12
And an external CPU (Centra
l Processing Unit). This transmission control unit 1
In 3, the setting for controlling the switch unit 32 is changed by changing the value of a register provided inside from the external CPU. The transmission control unit 13 generates the switching control signal S3 according to the setting of the register, and supplies the switching control signal S3 to the switch unit 32.
The data output to the SDTICP encoder 33 is controlled, and the data transmission processing unit 12 is controlled to transmit the compressed data or the non-compressed data output to the data receiving device 20.

The transmission control section 13 receives reproduction information from an image reproducing mechanism (not shown) from an external CPU. The transmission control unit 13 interprets the playback speed of the image playback mechanism based on the input playback information. For example, the transmission control unit 13 transmits the SDTICP stream to the stream transmission terminal 34 when the image reproduction mechanism is reproducing at a normal speed.
, A switching control signal S3 is generated so that the SDI stream is transmitted from the stream transmission terminal 34, and the switch unit 32 is controlled to be switched when the reproduction (search) is performed at a high speed.

Further, the transmission control unit 13 performs SDI / S
SDI data or SDTI by DTICP encoder 33
Information S4 indicating header data or auxiliary data for creating CP data is transferred to the SDI / SDTICP encoder 3.
Supply 3 The transmission control unit 13 converts various types of header data added to the head of the active video area of the SDI data and stream type identification information added to the head of the payload area of the SDTICP data into SDI / SDDT.
It is supplied to the ICP encoder 33. Further, the transmission control unit 13 supplies data type information added to the head of the data block.

Further, the transmission control unit 13 performs SDT
When controlling to create ICP data with the SDI / SDTICP encoder 33, a system item (Syst
The information indicating the “em Item” and the auxiliary item (Auxiliary Item) is supplied to the SDI / SDTICP encoder 33.

In such a data transmission apparatus 10, for example, even when an accurate stream cannot be transmitted due to high-speed reproduction, the SDI stream can be transmitted, so that the transmitted stream is not interrupted. The state of the transmitting side can be monitored by the data receiving device 20.

In the data transmitting apparatus 10, compressed data and non-compressed data can be switched by the switch unit 32 and transmitted to the data receiving apparatus 20, so that the transmitting / receiving terminal for uncompressed data and the transmitting / receiving terminal for compressed data The terminals can be shared, and the size of the device can be reduced.

Further, according to the data transmitting apparatus 10, since the compressed data and the uncompressed data can be switched and transmitted, the output content can be changed according to the corresponding format on the data receiving side. That is, according to the data transmitting apparatus 10, when the data receiving side is compatible with the SDTI standard, a stream conforming to the SDTI standard is transmitted, and when the data receiving side is not compatible with the SDTI standard, a stream conforming to the SDI standard is transmitted. Can be sent. Thus, for example, when the data transmission side is a VRT device and the data reception side is an AV server, it is possible to transmit and copy a video while suppressing deterioration of a video captured by the VTR device.

As shown in FIG. 2, the data receiving apparatus 20 includes a stream receiving section 41 connected to the data transmitting apparatus 10, an MPEG decoder 42 for performing processing conforming to the MPEG system, and a display switch section 4 for switching an image to be displayed.
3, an output control unit 44 for controlling output contents, and a display unit 45 for displaying an image.

The stream receiving section 41 includes an SDI / SDTI decoder 52 to which a SDI stream or SDTICP stream is serially input from a stream receiving terminal 51, a compressed data memory 53, a non-compressed data memory 54, an output switch section 55, The control unit 56 is provided.

The SDI / SDTI decoder 52 receives the SDI stream or SDTICP stream transmitted from the data transmitting apparatus 10 via the stream receiving terminal 51, and performs a decoding process. This SDI / SDTI
The decoder 52 extracts the timing signal added to the SDI data or SDTI data, and
Data separation of DTICP data is performed.

The SDI / SDTI decoder 52 reads the stream type identification information stored in the ancillary area, and outputs a stream type identification signal S11 indicating whether the received data stream is an SDI stream or an SDTICP stream to the reception control unit 56 and the output. Control unit 44
To supply.

The SDI / SDTI decoder 52
The data type information stored in the active video area and the payload area is read to identify the type of data stored in the active video area and the payload area.

The SDI / SDTI decoder 52 recognizes that the type of data stored in the payload area is data compressed by the MPEG system, and performs a depacking process using a pack header added to the compressed data. do. The SDI / SDTI decoder 52 supplies the decompressed compressed data S12 to the compressed data memory 53. The depacking process performed by the SDI / SDTI decoder 52 requires time (one frame period) for displaying one frame (one image).

The SDI / SDTI decoder 52
Extracts the uncompressed data S13 and S14 stored in the data area of the SDI data and
And output to the output switch unit 55.

The compressed data memory 53 is an SDI / SD
The compressed data S12 is input from the TI decoder 52, and the compressed data S12 is stored in accordance with the R (Read) / W (Write) timing signal S15 from the reception control unit 56.
Further, the compressed data memory 53 includes a reception control unit 56.
The stored compressed data is read by the MPEG decoder 42 in accordance with the R / W timing signal S15 from.
Thus, the compressed data stored in the compressed data memory 53 is input to the MPEG decoder 42 via the compressed data output port 57.

The non-compressed data memory 54 has an SDI / S
The uncompressed data S13 is input from the DTI decoder 52, and the R / W timing signal S16 from the reception control unit 56 is input.
, The compressed data S13 is stored. Further, the uncompressed data memory 54 stores the R /
The stored uncompressed data is read according to the W timing signal S16. As a result, the uncompressed data stored in the uncompressed data memory 54 is output to the output switch 55
Is input to

The output switch unit 55 has an SDI / SDTI
The uncompressed data is input from the decoder 52 and the uncompressed data memory 54, and the output selection signal S17 is input. The output switch section 55 outputs the output selection signal S
17, the uncompressed data S13 stored in the uncompressed data memory 54 is output or the SDI / SDT
Uncompressed data S14 directly input from the I decoder 52
Is output. Thus, the uncompressed data S18 included in the SDI data is input to the display switch unit 43 via the uncompressed data output port 58.

The reception control unit 56 receives the stream type identification signal S 11 from the SDI / SDTI decoder 52 and controls the operation timing of the compressed data memory 53, the non-compressed data memory 54 and the output switch unit 55. The reception control unit 56 holds the stream type identification signal S11 in an internal register, and refers to the stream type identification signal S11 held in the register to read the SDI signal.
It recognizes whether the stream input to the / SDTI decoder 52 is an SDI stream or an SDTICP stream, generates R / W timing signals S15 and S16, and supplies them to the compressed data memory 53 and the non-compressed data memory 54. , An output selection signal S17, and supplies the output selection signal S17 to the output switch unit 55.

The MPEG decoder 42 decodes the compressed data, which is input from the compressed data memory 53 via the compressed data output port 57, in accordance with the MPEG system. This MPEG decoder 42
Performs a decoding process for decompressing, and converts the compressed data into uncompressed image data S19 and outputs it to the display switch unit 43. The decoding process performed by the MPEG decoder 42 requires time (one frame period) for displaying one frame (one image).

The display switch unit 43 includes the image data 19 from the MPEG decoder 42 and the uncompressed data S from the output switch unit 55 via the uncompressed data output port 58.
18 and an output selection signal S20 from the output control unit 44. This display switch unit 43
Represents image data S19 based on the display selection signal S20.
And the non-compressed data S18 are switched and output to the display unit 45.

The output control unit 44 controls an image output from the display switch unit 43 to the display unit 45 and displayed on the display unit 45 based on the stream type identification signal S11 from the SDI / SDTI decoder 52.

The display section 45 receives the image data S19 or the uncompressed data S18 supplied from the display switch section 43 and displays an image.

Next, the operation when the data receiving apparatus 10 receives a stream from the data transmitting apparatus 1 will be described with reference to FIG.

According to FIG. 8, as shown in FIG. 8A, SDI data (hereinafter, SDI (n)) storing uncompressed data having a frame number “0” is stored in the stream reception terminal 51. (N: frame number)), S
DI (1), SDTICP data storing compressed data having a frame number of “0” (hereinafter referred to as SDTI (n) (n: frame number)), SDTI (0), SDT
SDI stream and SDTI in the order of I (1),.
CP stream is input over the time t ₀ ~t _6. Here, in the data transmission device 10, S till before time t _2.
The DI stream is transmitted to the data receiving device 20 at time t.
After the time t ₂ with the switching timing set to _2, the SDTICP stream is transmitted so as to be received by the data receiving device 20.

Between time t ₀ and time t ₂ , SDI
(0) and SDI (1) are SDI / SDTI decoders 5
2. SDI (0) and SDI (1) are output from the uncompressed data output port 58 via the output switch unit 55 (FIG. 8D), and SDI (0) and SDI (1) are displayed on the display unit 45.
Is displayed (FIG. 8 (g)). At this time,
The reception control unit 56 controls the output switch unit 55 so that the uncompressed data S14 is input and output from the uncompressed data output port 58, and the output control unit 44 controls the uncompressed data from the uncompressed data output port 58. The display switch unit 43 is controlled to output S18 to the display unit 45. Also,
The period from the time _{t 0 ~t 2, SDI (0} ) in the non-compressed data memory 54, SDI (1) is sequentially input, the contents of the non-compressed data memory 54 are successively updated.

At time t ₂ , the stream receiving terminal 5
Stream received from the SDI stream to SDT
SDI / SD that switching to ICP stream
When detected by the TI decoder 52, the SDI / SDTI decoder 52 outputs a stream type identification signal S11 indicating the SDTICP stream to the reception control unit 56 and the output control unit 44.

SDI / SDTI decoder 52 operates at time t.
_{When the} SDTICP stream is input in step _2, it performs depacking processing and outputs compressed data to the compressed data memory 53. At time t _{3 when} one frame period has elapsed from time t ₂ at which stream type identification signal S 11 was input from SDI / SDTI decoder 52, reception control section 56 performs R /
By supplying the W timing signal S15 to the compressed data memory 53, the SDTI is stored in the compressed data memory 53.
(0) is written and output to the MPEG decoder 42 (FIGS. 8B and 8E). Where SDI / SDT
The I decoder 52 requires one frame period to perform the depacking process.

[0082] Next, SDTI input to MPEG decoder 42 (0) after a lapse of one frame period required for the decoding process is output to the display switch part 43 at time t ₄ (FIG. 8 (f)). Next, the output control unit 44
(0) is output to the display switching section 43 a display selection signal S20 to be output to the display unit 45, and controls to display the data contained in the SDTI (0) at time t ₄ later (FIG. 8
(G)).

In such a data receiving apparatus 20, even when the stream to be received is switched from the SDI stream to the SDTICP stream, the SDTICP stream can be displayed after a lapse of two frame periods.

[0084] Further, in the data receiving apparatus 20, in response to the input stream type identification signal S11 by the reception control unit 56, stored in the time t ₂ the output selection signal S17 uncompressed data memory 54 Data 2
During the frame period, SDI (1) is output to the display switch unit 43 (FIGS. 8C and 8D), and SDI (1) is displayed over two frame periods (FIG. 8G). Thus, according to the data receiving apparatus 20, even when the stream to be received is switched from the SDI stream to the SDTICP stream, a still image is displayed during a period required to start displaying the SDTICP data. Thereby, in the data receiving device 20, the display unit 45 during the period required for displaying the SDTICP data is not set to the non-display state, and it is possible to suppress the user from feeling uncomfortable.

On the other hand, when the stream received by the data receiving device 20 is switched from the SDTICP stream to the SDI stream, the reception control unit 56 sets the SDI / SD
An output selection signal S17 for supplying uncompressed data directly to the display switch unit 43 without passing through the uncompressed data memory 54 from the TI decoder 52 is output to the output switch unit 55. In response, the output control unit 44 supplies a display selection signal S20 to the display switch unit 43 so as to output the uncompressed data S18 from the uncompressed data output port 58 from the image data S19 from the MPEG decoder 42.

Thus, the data receiving apparatus 20 can display an image on the display unit 45 without interruption even when the stream to be received is switched from the SDTICP stream to the SDI stream.

According to the data transmission system including the data transmitting apparatus 10 and the data receiving apparatus 20, when the data receiving apparatus 20 performs an editing process, when searching for an editing point, the data transmitting apparatus 10 transmits the SDI stream to the data transmitting apparatus 10.
When the EDL is transmitted to the data receiving apparatus 20 to create an EDL and the data transmitting apparatus 10 actually executes the editing process, the SDTICP stream can be transmitted from the data transmitting apparatus 10 to the data receiving apparatus 20. Thereby, when searching for an editing point, the SDI stream is transmitted to minimize the delay caused by decoding processing and the like, thereby suppressing the user's uncomfortable feeling when operating the editing apparatus, and suppressing the deterioration of the video as much as possible when actually executing the editing processing. As a result, an SDTICP stream including compressed data in the same format as the format used for recording by the editing device can be transmitted.

[0088]

As described in detail above, the present invention provides
Even when transmitting a serial data stream of a different format, a process in which a different format is switched on the data transmitting side and transmitted to the data receiving side, and the format of the received serial data stream is identified and switched and output on the data receiving side. It can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a data transmission device to which the present invention has been applied.

FIG. 2 is a block diagram illustrating a configuration of a data receiving device to which the present invention has been applied.

FIG. 3 is a diagram for explaining a data structure of SDI data.

FIG. 4 is a diagram for explaining a data structure of an active video area included in SDI data.

FIG. 5 is a diagram illustrating a data structure of SDTICP data.

FIG. 6 is a diagram for explaining a data structure of a payload area included in SDTICP data.

FIG. 7 is a diagram illustrating a data structure of an ancillary area included in SDTICP data.

FIG. 8 is a time chart for explaining the operation of the data receiving apparatus to which the present invention is applied.

[Explanation of symbols]

Reference Signs List 10 data transmission device, 11 data processing unit, 12 data transmission processing unit, 13 transmission control unit, 20 data reception device, 31 packing processing unit, 32 switch unit, 33
SDI / SDTICP encoder, 34 stream transmission terminal, 41 stream reception unit, 42 MPEG decoder, 43 display switch unit, 44 output control unit, 45
Display unit, 52 SDI / SDTI decoder, 53 memory for compressed data, 54 memory for uncompressed data, 55
Output switch section, 56 reception control section

Claims (5)

[Claims] 1. A switching means to which compressed data and / or uncompressed data is input, and to switch between compressed data and uncompressed data, and a header including data identification information for identifying compressed data or uncompressed data. Data is added to the data from the switching means to generate packet data of a predetermined format composed of header data and compressed data or packet data of a format different from the predetermined format composed of header data and uncompressed data. A data transmitting apparatus comprising: a packet generating unit that performs serial transmission of packet data generated by the packet generating unit; 2. An identification means for identifying whether a received serial data stream is a compressed serial data stream or an uncompressed serial data stream; and a data processing means for performing predetermined data processing on the compressed serial data stream. Switching means for switching and outputting the uncompressed serial data stream and the serial data stream subjected to predetermined data processing by the data processing means based on the identification result of the identification means. apparatus. 3. An identification means for identifying whether a received serial data stream is a compressed serial data stream or an uncompressed serial data stream; and a data processing means for performing predetermined data processing on the compressed serial data stream. A storage unit for data processing in which a compressed serial data stream subjected to predetermined data processing by the data processing unit is stored; and, based on an identification result of the identification unit and a processing timing of the data processing unit, A data receiving apparatus comprising: a switching output unit that switches and outputs a compressed serial data stream and a serial data stream that has been subjected to predetermined data processing by a data processing unit. 4. A data transmitting device for serially transmitting a compressed serial data stream or an uncompressed serial data stream to a data receiving destination, and a compressed serial data stream or an uncompressed serial data stream from the data transmitting device. Identification means for identifying whether the serial data stream is a serial data stream, data processing means for performing predetermined data processing on the compressed serial data stream, and the uncompressed serial data stream and data based on the identification result of the identification means. A data receiving device comprising: a switching unit that switches and outputs a serial data stream that has undergone predetermined data processing by the processing unit. 5. A data transmitting apparatus for serially transmitting a compressed serial data stream or an uncompressed serial data stream to a data receiving destination, a compressed serial data stream or an uncompressed serial data stream of a received serial data stream. Identification means for identifying whether or not the compressed serial data stream performs predetermined data processing on the compressed serial data stream; and data storing the compressed serial data stream subjected to predetermined data processing by the data processing means. The storage unit for processing, based on the identification result of the identification unit and the processing timing of the data processing unit, switches between the uncompressed serial data stream and the serial data stream that has been subjected to predetermined data processing by the data processing unit. Switching to output Data transmission system, characterized by and a data receiving device and means.