JPH10190767A - Data transmission device/method and data reception device/method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collectively transmit the data stream of different protocols through the transmission line of an SDDI(serial digital data interface) protocol. SOLUTION: The encoding part 120 of a data transmission device 12 code- converts the data stream of DVB(digital video broadcasting) ASI(first protocol). A synchronous byte insertion part 122 inserts the synchronous byte of the first protocol. A synchronous code insertion part 126 multiplexes the synchronous codes (3ffh, 000h and 00h) of an SDI(serial data interface) protocol and IIP (interface information packet) containing data showing the synchronous byte and the like. A P/S(parallel/serial) conversion part 128 converts the data stream into a serial system. An amplification/scramble part 130 executes a scramble processing, executes amplification, generates a transmission signal and transmits it to a data reception device 22. The respective constitution parts of the data reception device 2 execute processings opposite to the respective constitution parts of a data transmission device 10 and decode the data stream of the first protocol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to data of various protocols such as DVB serial or MPEG T
Data streams of various formats such as S, for example, SDI (SMPTE-259M) or SD
The present invention relates to a data transmitting apparatus, a data receiving apparatus, and a method for transmitting data via a communication line conforming to the physical conditions of SDDI with improved I.

[0002]

2. Description of the Related Art In a television broadcasting station or the like, SDI (serial data interface; SMPTE-259) is used for transmitting audio / video data.
M), and SDDI (seria
l digital data interface) is widely used, and SDDI or the like which maintains compatibility with the SDI has been devised.

On the other hand, in recent years, a moving picture experts group (MPEG) method has been used as a compression method for audio / video data, and audio / video data compression-encoded by the MPEG method is generally in the form of MPEG2 TS. Transmitted. Also, European digital video broadcasting
Then, as a transmission protocol, DVB serial (digital
video broadcasting serial) is used.

[0004] The physical layer of each of the above-mentioned protocols is common, and the same transmission rate and the same transmission path are used.
Transmit audio / video data at two points. However, the data link layers of these protocols are different, and the data link layer and the physical layer are rigidly defined by the application layer that processes audio / video data to be transmitted. Therefore, a plurality of lower layer transmission devices are required according to the type of the upper application layer. For this reason, a plurality of application layers cannot be multiplexed and transmitted.

The present invention has been made in view of the above-mentioned problems of the prior art, and transmits a data stream by sharing a lower layer transmission device between audio / video data processing devices of different types of application layers. It is an object of the present invention to provide a data transmission device, a data transmission device, and a method thereof capable of performing the following. Another object of the present invention is to provide a data transmission device, a data transmission device, and a method thereof that can multiplex and transmit a plurality of application layers. Also, specifically,
The present invention relates to a data transmission device capable of transmitting data streams of various protocols such as DVB serial or various formats such as MPEG2 TS via a common SDI protocol or SDDI protocol transmission path, and a data reception apparatus. It is an object to provide devices and their methods.

[0006]

In order to achieve the above-mentioned object, a data transmitting apparatus according to the present invention is provided for transmitting transmission data to be transmitted to one or more first transmission codes each having a unique first synchronization code. First data stream generating means for generating a first protocol data stream including the encoded transmission data and the interface information of each of the first protocols. A second data stream different from the first synchronization code is added to the data stream of the first protocol.
A second synchronization code multiplexing unit for multiplexing a second synchronization code of the protocol, and a data stream of the first protocol multiplexed with the second synchronization code, adapted to the second protocol. Data transmission means for transmitting the data to the transmission path.

[0007] More specifically, the first protocol includes at least DVB ASI, and the second protocol is SDI (SMPTE-259M) and SDDI.

[0008] The second protocol transmits data using a predetermined transmission packet, and the synchronization code multiplexing means converts the second synchronization code into a data stream of the first protocol in a parallel format. And inserting a stuffing in a gap between the transmission packets with the second synchronization code.

[0009] The data transmission means includes a parallel / serial conversion means for converting the data stream of the first protocol in a parallel format into which the second synchronization code is inserted into a serial format by parallel / serial conversion; Scramble processing means for scrambling the serial-converted data stream of the first protocol.

[0010] The data transmitting apparatus according to the present invention is, for example,
DVB ASI [Transmission protocol for transmitting an elementary stream (ES; packetized PES) of packetized MPEG compressed data before being converted into a program stream (PS) or transport stream (TS) ], Etc. (first protocol), an upper layer (application layer)
Is transmitted via a common SDI protocol or SDDI protocol (second protocol) physical layer transmission path.

In the data transmission apparatus according to the present invention, the first data stream generating means converts 8-bit parallel audio / video data of a first protocol using a unique synchronization code into each of audio and video data such as DVB. The audio / video data of the protocol is transferred to DVB-PI-154 A
The encoding (code conversion) is performed so that the synchronization code (3ffh, 000h, 000h) of the SDI protocol or the SDDI protocol (second protocol) is not generated by the 8-bit / 10-bit conversion according to the conversion table specified in the Nnex C. ), And further adds interface information to generate a data stream of a first protocol suitable for the physical layer of the 10-bit parallel format SDI protocol or SDDI protocol.

[0012] The second synchronization code multiplexing means includes a synchronization code (3ffh, 000h, 000) of the second protocol.
h) at a predetermined position in the data stream of the first protocol generated as described above.

The data transmission means converts the data stream of the first protocol, in which the synchronization code (3ffh, 000h, 000h) of the second protocol is multiplexed at a predetermined position, from parallel / serial, and further performs a scrambling process. For example, the data is transmitted to a transmission path for the second protocol of 270 Mbps serial.

Further, the data receiving apparatus according to the present invention is a data receiving apparatus which transmits via a transmission path conforming to a second protocol and includes encoded (code converted) transmission data and a first synchronization code. Data receiving means for receiving a data stream of a protocol, and detecting a second synchronization code of the second protocol, different from the first synchronization code, multiplexed on the received data stream of the first protocol. There is provided a second synchronization code detection unit, and a first synchronization code detection unit that detects the first synchronization code of the data stream of the first protocol that has detected the second synchronization code.

[0015] Specifically, the first protocol includes at least DVB ASI, and the second protocol is SDI (SMPTE-259M) and SDDI.

[0016] Preferably, the data stream of the first protocol in which the second synchronization code is multiplexed is in a serial format and is scrambled, and the data receiving means includes a second synchronization code. Descrambler for descrambling the multiplexed data stream of the first protocol, and serial / parallel converter for serial / parallel conversion of the descrambled data stream of the first protocol, The second synchronization code detecting means deletes the second synchronization code multiplexed into the serial / parallel converted data stream of the first protocol.

Preferably, the apparatus further comprises decoding means for decoding the transmission data included in the data stream of the first protocol which has detected the first synchronization code.

The data receiving apparatus according to the present invention receives a data stream transmitted from the data transmitting apparatus according to the present invention through the transmission path of the SDI protocol or the SDDI protocol, and receives the data stream of the first protocol. Is output.

[0019] In the data receiving apparatus according to the present invention, the data receiving means transmits the data from the data transmitting apparatus according to the present invention to S
The data stream transmitted via the serial transmission path of the DI protocol or the SDDI protocol (second protocol) is received, descrambled, serial / parallel converted, and the synchronization code (second code) of the second protocol is transmitted. 3ffh, 000h, 00h) into a 10-bit parallel format first protocol data stream.

The synchronization code detecting means is a synchronization code (3ffh, 000) of the second protocol inserted into the data stream of the first protocol in the 10-bit parallel format.
h, 00h) is detected and deleted. The first synchronization code detecting means is configured to output a synchronization code (3ffh,
000h, 00h) is detected in the data stream of the first protocol from which the first synchronization code is deleted.

The decoding means converts the data stream of the first protocol into a 10-bit parallel data stream based on, for example, data indicating a method of 8-bit / 10-bit conversion at the transmitting side multiplexed with the data stream of the first protocol. The data is decoded by converting the format into an 8-bit parallel format, and is supplied to an audio / video data processing device of an upper layer (application layer) of the first protocol.

Further, the data transmission method according to the present invention encodes transmission data to be transmitted so as to conform to a first protocol having a first synchronization code, and includes the encoded transmission data. A data stream of a first protocol is generated, and a second data stream different from the first synchronization code is added to the generated data stream of the first protocol.
Multiplexing a second synchronization code of the protocol of
And transmits the data stream of the first protocol multiplexed with the synchronization code to a transmission path conforming to the second protocol.

Further, the data receiving method according to the present invention provides a data stream of a first protocol, which is transmitted via a transmission path adapted to a second protocol and includes encoded transmission data and a first synchronization code. And detecting a second synchronization code of the second protocol, different from the first synchronization code, multiplexed in the received data stream of the first protocol, and detecting a second synchronization code. And detecting the first synchronization code of the data stream of the first protocol.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of the present invention will be described.

Transmission Format of Data Link Layer FIGS. 1A to 1C are diagrams showing a transmission format of a lower layer according to the present invention. First, referring to FIG.
The transmission format of the lower layer used in the data transmission system 2 shown in FIG. 3 will be described.

As shown in FIG. 1A, the lower layer according to the present invention is an MPEG TS (transport stream; MP).
EG type packetized elementary stream subdivided for transmission media), MPEG packets, MP
EG PES [a data stream in a format such as a packetized elementary stream of MPEG-compressed data, and a DVB AS
I and other protocols (DVB ASI is a transmission protocol, and MPEG PES is a data stream format, so they are not the same. However, for the sake of simplicity of description, these are hereinafter collectively referred to as a first protocol. When transmitting a data stream including audio / video data generated by the audio / video data processing device of each upper layer (application layer) of the abbreviation (abbreviation), a second synchronization code (common synchronization code) is commonly used. Protocol (SDI and SDDI) special code (3f
fh, 000h, 000h).

After this special code, for example,
8B / D shown in Annex C of DVB-PI-154
10B conversion table byte name (data conversion code),
Also, ID data indicating a synchronization byte (synchronous special code) used by each of the first protocols is added, and after the ID data, a synchronization special code, a data conversion table, and the like are added as a payload. , Interface information packet (IIP;
interface information packet) and transmit it.
There is also a method of adding an identifier indicating a protocol after the special code.

Further, as shown in FIGS. 1B and 1C, following this IIP, for example, a data stream such as an MPEG transport packet and an MPEG PES is transmitted as a payload in units of 1880 bits or 2040 bits. The parts not used for data transmission between these payloads include SDI and SDDI
Special code (3ffh, 000h, 000h)
Are transmitted as stuffing data in units of 3n × 10 bits (n is an integer). This special code is a unique code sequence, and the 10-bit synchronization is restarted from the end of the synchronization code, which means that the word phases of the data of the respective protocols to be multiplexed do not need to match. Note that there is a method of inserting m × 10 bits as a stuffing data with a synchronization code. In this case, it is necessary to match the word phases of the data of the respective protocols to be multiplexed. The data streams shown in FIGS. 1A to 1C are in a 270 Mbps serial format conforming to the physical layers of SDI and SDDI.
The data is transmitted between devices via a coaxial cable or the like, and is converted into a 10-bit parallel format and processed inside the device.

Basic Layer of SDI, SDDI Protocol
Data transmission system 1 Figure 2 is a diagram showing SDI, a configuration of a data transmission system 1 of the base layer of the SDDI protocol. The data transmission system 1 is used to connect between processing devices of each second protocol, and as shown in FIG.
In the data transmission system 1 of the DI protocol, the data transmitting device 10 and the data receiving device 20
08 to be connected.

The data transmission device 10 is SDI, SDDI
Synchronization code insertion unit 100, parallel / serial (P /
S) It is composed of a converter 102, an amplifier / scrambler 104, and a connector 106. Data receiving device 20
Is composed of a connector 200, an amplification / descrambling unit 202, and a serial / parallel (S / P) conversion unit 204.

SDI / SDDI synchronization code insertion unit 100
Inserts a special code (3ffh, 000h, 000h) into a data stream (asynchronous stream) of an asynchronous SDDI protocol in a 10-bit parallel format and outputs it to the P / S converter 102. The P / S conversion unit 102 includes an SDI / SDDI synchronization code insertion unit 100
Is converted from parallel to serial and output to the amplification / scramble section 104.

The amplifying / scrambler 104 scrambles and amplifies the data stream input from the P / S converter 102, generates a 270 Mbps parallel transmission signal, and connects the connector 106, the coaxial cable 108, and the connector 200 to each other. The data is transmitted to the data receiving device 20 via

The amplifying / descrambling section 202 amplifies a transmission signal input via the coaxial cable 108 and the connector 200, converts the signal into digital data, descrambles the signal, and outputs it to the S / P converter 204. . S
The / P conversion unit 204 detects a special code of the data stream input from the amplification / descrambling unit 202, and serial / parallel converts the data stream so that the special code is correctly arranged. Plays and outputs the data stream of the SDDI protocol.

In the data transmission system 2 described below, an interface is prepared by using a special code of the SDI protocol or the SDDI protocol as a header and adding ID data and a payload shown in FIG. 1A after the special code. An information packet (IIP) is configured.

The data transmission system 2 Fig. 3 is a diagram showing a configuration of a data transmission system 2 according to the present invention in a first embodiment. As shown in FIG. 3, the data transmission system 2 includes a data transmission device 12 and a data reception device 22 similarly to the data transmission system 1.
Are connected via a coaxial cable 108.

The data transmission device 12 includes an encoding (code conversion) unit 120, a synchronization byte insertion unit 122, a conversion code table 124, a synchronization code insertion unit 126, a P / S conversion unit 128, an amplification / scramble unit 130, and a connector 1
32. The data receiving device 22 includes a connector 220, an amplification / descrambling unit 222, an S / P conversion unit 224, a conversion code table 226, a synchronization code detection unit 228, a synchronization byte detection unit 230, and a decoding unit 232.

Data transmission device 1 of data transmission system 2
2, the encoding (code conversion) unit 120 includes the SD
I (SMPTE-259M) or MPEG2 TS, MEPG2 TS packet, M
An arbitrary one of data streams in a format such as PEG2 PES is input, and an encoding (code conversion) unit 120 is input.
Performs encoding (code conversion) such as converting the word width of the data stream from 8 bits to 10 bits when the input data stream is 8 bits wide, and Output.

The synchronization byte insertion unit 122 inserts a synchronization byte unique to each of the first protocols into the 10-bit parallel data stream input from the synchronization byte insertion unit 122, Output.

The synchronization code insertion unit 126 converts the IIP ID data shown in FIG.
The encoding (code conversion) unit 120 uses the data indicating the synchronization byte (synchronous special code) inserted by the encoding unit 22 as a payload of the IIP shown in FIG.
DVB used for encoding (code conversion) such as 0-bit conversion
-Insert data indicating the conversion table of Annex C of PI-154, etc., and further, as shown in FIG. 1 (A), the special code (3ffh, 00
0h, 00h) to insert the amplification / scramble unit 13
Output for 0.

The P / S conversion section 128 converts the 10-bit parallel data stream input from the synchronization code insertion section 126 into a serial format, and outputs it to the amplification / scramble section 130. Amplification / scramble section 1
30 scrambles and amplifies the serial data stream input from the P / S conversion unit 128, and 270 of the SDDI protocol shown in FIGS. 1B and 1C.
Generate a transmission signal in Mbps serial format, and
32, and transmits the data to the data receiving device 22 via the coaxial cable 108 and the connector 220.

In the data receiving device 22, the amplifying / descrambling unit 222 amplifies the transmission signal transmitted from the data transmitting device 12, converts the signal into digital data, descrambles the signal, and sends it to the S / P converter 224. Output to The S / P conversion unit 224 uses the inserted SDD
I protocol special code (3ffh, 000
(h, 00h) becomes a correct arrangement, the data stream input from the amplification / descrambling unit 222 is converted from serial to parallel, a 10-bit parallel data stream is generated, and the Output.

The synchronization code detection unit 228 detects a special code (3ffh, 000h, 00h) included in the data stream input from the S / P conversion unit 224, and outputs an IIP [FIG.
(A)], detects the ID data and the payload, deletes the IIP, and outputs it to the synchronization byte detection unit 230.

The synchronization byte detector 230 detects the synchronization byte included as the ID data of the IIP (FIG. 1A) detected by the synchronization code detector 228,
From the data stream input from the synchronization code detection unit 228, the synchronization byte of each of the first protocols is detected and output to the decoding unit 232. The decoding unit 232
The IIP detected by the synchronization code detector 228 [FIG.
(A)], for example, a data stream in a 10-bit parallel format is converted into an 8-bit parallel format suitable for the first protocol, and the data stream in the first protocol is decoded based on the information of the ID data or the payload. And output.

Operation of Data Transmission System 2 The operation of the data transmission system 2 will be described below. The encoding (code conversion) unit 120 of the data transmission device 12 converts the input data stream of the first protocol into
For example, encoding (code conversion) is performed by performing an 8-bit / 10-bit conversion process or the like.

The synchronization byte insertion unit 122 receives the input 1
A synchronization byte unique to each of the first protocols is inserted into the 0-bit parallel data stream. The synchronization code insertion unit 126 includes a special code (3ffh, 000h, 00h) of the second protocol and the first protocol.
The data indicating the synchronization byte of the protocol and the data indicating the conversion table used for encoding (code conversion) such as 8-bit / 10-bit conversion are represented by IIP [FIG. 1 (A)].
And multiplex it into the data stream.

The P / S converter 128 converts an input data stream into a serial format. The amplifying / scrambler 130 scrambles the input serial data stream, amplifies it to generate a transmission signal, and transmits the transmission signal via the coaxial cable 108 or the like.
Send to

In the data receiving device 22, the amplification / descrambling unit 222 amplifies the transmitted transmission signal and performs a descrambling process. The S / P converter 224 includes:
SDDI protocol special code (3ffh, 0
00h, 00h), the input data stream is converted from serial / parallel to a 10-bit parallel format.

The synchronization code detecting section 228 outputs a special code (3ff) included in the input data stream.
h, 000h, 00h) based on the IIP [FIG.
(A)], and deletes the IIP. The synchronization byte detection unit 230 includes a synchronization code detection unit 22.
8 detects a synchronization byte of the first protocol from the input data stream based on the detected IIP data (FIG. 1A). The decoding unit 232 decodes the data stream of the first protocol based on the data of the IIP [FIG. 1A] detected by the synchronization code detection unit 228.

As described above, the data transmission system 2 according to the present invention multiplexes an IIP (FIG. 1A) into a data stream on the data transmission device 12 side and uses the IIP on the data reception device 22 side. Is configured to decode the data stream of the first protocol.
An arbitrary first protocol data stream can be transmitted via a transmission path adapted to the second protocol.

The data transmission system 2 according to the present invention
Multiplexes a special code (3ffh, 000h, 00h) of the second protocol on a data stream of an arbitrary first protocol whose data width has been converted to be compatible with the second protocol on the side of the data transmission device 12. Since the data stream is transmitted to the data receiving device 22 side, a data stream of an arbitrary first protocol can be transmitted via the transmission path for the first protocol.

For processing in the physical layer,
A data transmission device 12 of the data transmission system 2, and
The functions required of the data receiving device 22 are the conventional SDI
(SMPTE-259) Protocol has only a signal transmission / reception function, a memory function for 8-bit / 10-bit conversion processing, and a shift register function for resynchronization, so that the configuration is simple. It is.

Second Embodiment Hereinafter, a second embodiment of the present invention will be described. The data transmission system 2 (FIG. 3) shown in the first embodiment is positioned as a general form of a system that transmits a data stream of a first protocol via a transmission path of a second protocol. Hereinafter, as a second embodiment, a data transmission system 3 that transmits a data stream of the DVB asynchronous protocol via a transmission path of the first protocol will be described.

FIG. 4 is a diagram showing the configuration of the data transmission system 3 according to the present invention in the second embodiment. FIG.
As shown in the figure, the data transmission system 3 is configured by connecting a data transmission device 14 and a data reception device 24 via a coaxial cable 108, similarly to the data transmission system 2.

The data transmission device 14 includes an encoding (code conversion) unit 140, a synchronization byte insertion unit 142, a P / S conversion unit 144, an amplification / scramble unit 146, and a connector 1.
48. The data receiving device 24 includes a connector 240, an amplifying / descrambling unit 242, an S / P
Conversion unit 244, synchronization byte detection unit 246, and decoding unit 2
48.

Data transmission device 1 of data transmission system 2
4, the encoding (code conversion) unit 140
A data stream of the MPEG2 TS protocol is input as a data stream of the B asynchronous protocol (first protocol), and the encoding (code conversion) unit 120
Converts the input data stream into 8 bits / 10 bits by code conversion (code conversion) and outputs the encoded data stream to the synchronization byte insertion unit 142.

The synchronization byte insertion unit 142 inserts a 3-byte synchronization byte of the DVB asynchronous protocol into the 10-bit parallel format data stream input from the synchronization byte insertion unit 142, and sends the synchronization byte to the P / S conversion unit 144. Output.

The P / S converter 144 inserts a special code (3ffh, 000h, 00h) of the SDDI system, converts a 10-bit parallel data stream into a serial format, and converts the data stream into a serial format.
6 is output. The amplification / scramble unit 146
The serial data stream input from the P / S converter 144 is scrambled, amplified, and
48, and transmits the data to the data receiving device 24 via the coaxial cable 108 and the connector 240.

In the data receiving device 24, the amplifying / descrambling unit 242 amplifies the transmission signal transmitted from the data transmitting device 14, converts the signal into digital data, descrambles the signal, and sends it to the S / P converter 244. Output to The S / P conversion unit 244 performs serial / parallel conversion on the data stream input from the amplification / descrambling unit 222, generates a 10-bit parallel data stream, and outputs the data stream to the synchronization byte detection unit 246.

The synchronization code detection unit 246 outputs the IIP [FIG.
(A)], the S / P conversion unit 24
4, a synchronization byte of the DVB asynchronous protocol (first protocol) is detected from the data stream input from the data stream 4 and output to the decoding unit 248. The decoding unit 232
10 based on the ID data of the IIP [FIG.
The data stream in the bit parallel format is converted into an 8-bit parallel format compatible with the DVB asynchronous protocol (first protocol), and the data stream of the first protocol is decoded and output.

As described above, by configuring the data transmission system 3, a data stream of the DVB asynchronous protocol can be transmitted while storing protocols other than the physical layer.

Modifications Hereinafter, as a modification of the third embodiment of the present invention, SDI
The data stream of the (SMPTE-259M) protocol (first protocol) is transferred to the SDDI protocol (first protocol).
A description will be given of a data transmission system 4 for transmitting data via a transmission path of (a protocol).

FIG. 5 is a diagram showing a modification of the data transmission system 3 shown in the second embodiment and a configuration of the data transmission system 4. The data transmission system 3 shown in FIG.
2 is the same as the data transmission system 1 shown in FIG. In FIG. 5, the same components as those of the data transmission system 3 among the components of the data transmission system 4 are denoted by the same reference numerals.

As shown in FIG. 5, the data transmission system 4
Means that the data transmitting device 16 and the data receiving device 26
The connection is made via a coaxial cable 108. The data transmission device 16 is the data transmission device 14 shown in FIG.
, The encoding (code conversion) unit 140 is omitted, and the data receiving device 26 employs a configuration in which the decoding unit 248 is omitted from the data receiving device 24 shown in FIG.

Since both the SDI protocol and the SDDI protocol process the data stream in a 10-bit parallel format inside the device, the encoding (code conversion) unit 1 of the data transmission device 14 that performs the 8-bit / 10-bit conversion
40 and the decoding unit 248 of the data receiving device 24 can be omitted.

Incidentally, by appropriately modifying the data transmission system 3 and the like, the packet synchronous MPEG2 TS
Data streams of other protocols, such as
It goes without saying that the data can be transmitted via the transmission path of the SDDI protocol. Also, each component of the data transmission system according to the present invention shown in each of the above embodiments, as long as the same performance and function can be realized, irrespective of software or hardware,
Further, it can be replaced with another equivalent means.

[0066]

As described above, according to the data transmitting apparatus, the data receiving apparatus, and the methods thereof according to the present invention, a lower layer transmission apparatus is used between audio / video data processing apparatuses of different types of application layers. Can be used to transmit a data stream.

Further, according to the data transmitting apparatus, the data receiving apparatus, and the methods thereof according to the present invention, it is possible to multiplex and transmit a plurality of application layers.
Further, according to the data transmitting device, the data receiving device, and the methods thereof according to the present invention, various protocols such as DVB serial or various formats of data streams such as MPEG2 TS can be transmitted to a common SDI protocol or SDDI protocol. Can be transmitted via the transmission path.

[Brief description of the drawings]

FIGS. 1A to 1C are diagrams showing a transmission format of a lower layer according to the present invention.

FIG. 2 is a diagram showing a configuration of a data transmission system of a basic layer of the SDDI protocol.

FIG. 3 is a diagram illustrating a configuration of a data transmission system according to the present invention in the first embodiment.

FIG. 4 is a diagram showing a configuration of a data transmission system according to the present invention in a second embodiment.

FIG. 5 is a diagram showing a configuration of a modification of the data transmission system shown in the second embodiment.

[Explanation of symbols]

1, 2, 3, 4 ... data transmission system, 10, 12, 1
4, 16: data transmission device, 100: SDI, SDDI
Synchronization code insertion unit, 102 P / S conversion unit, 104 amplification / scramble unit, 106, 132, 148 connector, 120 encoding (code conversion) unit, 122 synchronization byte insertion unit, 126 synchronization code insertion Part, 128 ... P /
S conversion unit, 130: amplification / scramble unit, 140: coding (code conversion) unit, 142: synchronization byte insertion unit, 1
44: P / S conversion section, 146: amplification / scramble section,
20, 22, 24, 26 ... data receiving device, 200, 2
20, 240: connector, 202: amplification / descrambling unit, 204: S / P conversion unit, 222: amplification / descrambling unit, 224: S / P conversion unit, 228: synchronization code detection unit, 230: synchronization byte detection Part, 232... Decoding part,
Reference numeral 242 denotes an amplification / descrambling unit, 244 denotes an S / P conversion unit, and 246 denotes a synchronization byte detection unit.

Claims (16)

[Claims] The transmission data to be transmitted is encoded so as to conform to one or more first protocols each having a unique first synchronization code, and the encoded transmission data and the first transmission data are encoded. First data stream generating means for generating a data stream of a first protocol including interface information of each protocol; and generating the data stream of the first protocol,
A second protocol of a second protocol different from the first synchronization code
A second synchronization code multiplexing unit that multiplexes the synchronization code of the first protocol, and a data stream of the first protocol in which the second synchronization code is multiplexed is transmitted to a transmission path that conforms to the second protocol. A data transmission device having data transmission means. 2. The method according to claim 1, wherein the first protocol comprises at least DV.
B ASI, and the second protocol is SDI (SMPTE-259
2. The data transmission device according to claim 1, wherein the data transmission device is M) and SDDI. 3. The second protocol transmits data using a predetermined transmission packet, and the synchronization code multiplexing means converts the second synchronization code into data of the first protocol in a parallel format. The data transmission device according to claim 1, wherein the data transmission device is inserted into a stream, and a gap between the transmission packets is stuffed with the second synchronization code. 4. A parallel / serial converter for converting the data stream of the first protocol in a parallel format into which the second synchronization code is inserted into a serial format by parallel / serial conversion; 4. The data transmitting apparatus according to claim 3, further comprising: a scramble processing unit that scrambles the data stream of the first protocol that has been subjected to the parallel / serial conversion. 5. A data receiving means for receiving a first protocol data stream transmitted through a transmission path adapted to a second protocol and including encoded transmission data and a first synchronization code; Second synchronization code detecting means for detecting a second synchronization code of the second protocol different from the first synchronization code, multiplexed on the data stream of the first protocol, and a second synchronization Detecting a first synchronization code of the data stream of the first protocol that has detected the code;
Data receiving device having a synchronous code detecting means. 6. The method according to claim 1, wherein the first protocol comprises at least DV.
B ASI, and the second protocol is SDI (SMPTE-259
M) and SDDI. 7. A first multiplexed second synchronization code.
The data stream of the first protocol is in a serial format and is scrambled, and the data receiving means descrambles the data stream of the first protocol in which the second synchronization code is multiplexed. And serial / parallel conversion means for serial / parallel conversion of the descrambled data stream of the first protocol, wherein the second synchronization code detection means comprises a serial / parallel conversion of the first protocol. The data receiving apparatus according to claim 5, wherein the second synchronization code multiplexed in the data stream is deleted. 8. The data receiving apparatus according to claim 5, further comprising: decoding means for decoding transmission data included in the data stream of the first protocol which has detected the first synchronization code. 9. A transmission data to be transmitted is encoded so as to conform to a first protocol having a first synchronization code, and a data stream of a first protocol including the encoded transmission data is generated. And generating the data stream of the first protocol,
A second protocol of a second protocol different from the first synchronization code
A data transmission method of multiplexing the synchronization code of the first protocol and transmitting a data stream of the first protocol in which the second synchronization code is multiplexed to a transmission path conforming to the second protocol. 10. The method according to claim 1, wherein said first protocol is at least D
VB ASI, and the second protocol is SDI (SMPTE-259
M) and SDDI. 11. The method according to claim 9, wherein the second protocol transmits data using a predetermined transmission packet, and inserts the second synchronization code into a data stream of the first protocol in a parallel format. Data transmission method described. 12. A data stream of the first protocol in a parallel format into which the second synchronization code is inserted,
12. The data transmission method according to claim 11, wherein the data stream of the first protocol that has been subjected to the parallel / serial conversion to serial format and the parallel / serial conversion is subjected to scramble processing. 13. A first protocol data stream transmitted and transmitted via a transmission path adapted to a second protocol and including a coded transmission data and a first synchronization code, and receiving the first protocol data stream. Detecting a second synchronization code of the second protocol, different from the first synchronization code, multiplexed with the data stream of the first protocol, and detecting the second synchronization code. A data receiving method for detecting the first synchronization code. 14. The method of claim 1, wherein the first protocol comprises at least D
VB ASI, and the second protocol is SDI (SMPTE-259
The data receiving method according to claim 13, wherein the data receiving method is M) and SDDI. 15. The first protocol data stream in which the second synchronization code is multiplexed is in a serial format and is scrambled, and the first synchronization data in which the second synchronization code is multiplexed is provided. Descrambles the data stream of the first protocol, serial / parallel converts the descrambled data stream of the first protocol, and multiplexes the second data stream multiplexed with the serial / parallel converted data stream of the first protocol. 14. The data receiving method according to claim 13, wherein the synchronization code is deleted. 16. The data receiving method according to claim 13, wherein the transmission data included in the data stream of the first protocol in which the first synchronization code is detected is decoded.