JP2001144717A - Interface device for digital broadcasting and signal processing method for digital broadcasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately generate an auxiliary signal corresponding to a data stream for digital broadcasting and to supply the auxiliary signal to a transmission line encoding device. SOLUTION: When a synchronous pattern detecting part 10 detects a unique word included in a data stream outputted from a stream generator 1, the part 10 transmits a detection signal to the effect that the unique word is detected to an auxiliary signal generating part 11. When the part 11 receives the detection signal from the part 10, the part 11 makes a counter 20 perform count operation while synchronizing with timing to receive the signal. The counter 20 establishes synchronization with a super frame. The part 11 specifies timing to supply an auxiliary signal to the transmission line encoding device 3 on the basis of the count operation of the counter 20 and supplies the auxiliary signal to the device 3 at the same timing as, for instance, timing at which data located at the front of a super frame configuration is inputted to the device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast interface device and a digital broadcast signal processing method for supplying a data stream for digital broadcast to a transmission path coding device, and more particularly to a data process for digital broadcast. The present invention relates to a digital broadcast interface device and a digital broadcast signal processing method capable of appropriately generating an auxiliary signal corresponding to a column and supplying the generated auxiliary signal to a transmission path coding device.

[0002]

2. Description of the Related Art Broadband radio waves are effectively used to achieve high quality.
In order to realize multi-channel television broadcasting, television broadcasting has been digitized. As digital television broadcasting that has already been put into practical use, DV
B (Digital Video Broadcasting) and CS (Communicat
An ion satellite) is known. Further, BS (Broadcasting Satellite) digital broadcasting is being developed for practical use in 2000.

FIG. 3 is a diagram showing a configuration of a data string used in DVB or CS digital broadcasting. As shown in the figure, this data sequence forms a packet in units of 204 bytes, and the first byte indicates a predetermined pattern (47h) representing a synchronization byte. This data string is
MPEG-2 (Moving Picture Expert Group phase2)
Is output from a data generator or a data recorder, which is a signal source of a TS (Transport Stream) signal according to the standard.

[0004] A data string output from a data generator or a data recorder is supplied to a transmission path encoding device and added with an inner code such as a convolutional code. At this time, the conventional data generator or data recorder supplies a packet synchronization signal having a length of one byte time as an auxiliary signal indicating synchronization to the transmission path encoder at the same timing as the synchronization byte in the data string. I do.

[0005]

On the other hand, the data sequence used in BS digital broadcasting has a different structure from conventional DVB or CS digital broadcasting. In other words, the data stream for BS digital broadcasting constitutes a frame (superframe) in units of 78336 bytes, and the first byte shows a pattern (1Bh) different from the data stream for DVB or CS digital broadcasting. ing. For this reason, conventional data generators and data recorders output data strings for BS digital broadcasting,
When supplying this to a transmission line encoder for BS digital broadcasting, an auxiliary signal indicating frame synchronization could not be supplied.

[0006] From an economic point of view, in order to be able to supply an auxiliary signal indicating frame synchronization to a transmission line coding device for BS digital broadcasting, the entire existing equipment such as a data generator and a data recorder is required. It is not preferable to change it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has an interface device for digital broadcasting capable of appropriately generating an auxiliary signal corresponding to data for digital broadcasting and supplying the auxiliary signal to a transmission line encoding device. The purpose is to provide.

[0008]

In order to achieve the above object, a digital broadcast interface device according to a first aspect of the present invention is a digital broadcast interface device, comprising a data sequence constituting a superframe composed of a plurality of frames, comprising a transmission line code. Detecting means for detecting a unique word included in a data sequence input to the encoding device, and generating an auxiliary signal for specifying a superframe configuration of the data sequence input to the transmission path encoding device; And an auxiliary signal supply unit that supplies the transmission path encoding device with a predetermined timing based on the timing at which the unique word is detected.

According to the present invention, a unique word included in a data string constituting a superframe is detected,
An auxiliary signal for specifying the superframe configuration can be supplied to the transmission path encoding device at a predetermined timing based on the timing at which the unique word is detected. Thus, even if a data string is output by a device that cannot supply an auxiliary signal to the transmission path encoding device, the auxiliary signal can be appropriately generated and supplied.

Preferably, the unique word detected by the detecting means is a frame synchronization signal included at a predetermined position in a data string. Further, it is preferable that the auxiliary signal supply unit includes a count unit that establishes synchronization with a superframe by performing a count operation based on a timing at which the detection unit detects a unique word.
This makes it possible to specify the timing at which the auxiliary signal is supplied to the transmission path encoding device, and appropriately generate and supply the auxiliary signal.

The auxiliary signal supply means specifies a superframe configuration at a timing at which head data in a superframe configuration of a data sequence input to the transmission channel encoding device is input to the transmission channel encoding device. Is desirably supplied to the transmission path encoding device.

A digital broadcast interface device according to a second aspect of the present invention includes a BS (Broadcasting).
Satellite) Detects a unique word included in a data stream for digital broadcasting, establishes frame synchronization by a counting operation based on the timing at which the unique word is detected, and transmits an auxiliary signal indicating frame synchronization at a predetermined timing to a transmission line code. Supplied to a gasifier.

According to the present invention, an auxiliary signal indicating frame synchronization can be supplied to the transmission line encoding device at a predetermined timing based on the timing at which a unique word included in a data stream for BS digital broadcasting is detected. ,
The auxiliary signal can be appropriately generated and supplied to the transmission path encoding device.

The digital broadcast interface device according to a third aspect of the present invention is a digital broadcast interface device comprising: a BS (Broadcasting);
Satellite) Receives a data stream having a superframe configuration for digital broadcasting from a stream generator, detects a frame synchronization signal included in the data stream, and synchronizes with the superframe by a counting operation based on the timing of detecting the frame synchronization signal. Establishing and supplying a data sequence received from the stream generator to the transmission line encoding device, and at a predetermined timing, supplying an auxiliary signal for specifying a superframe configuration to the transmission line encoding device. Features.

According to the present invention, a data sequence having a superframe structure for BS digital broadcasting is received from a stream generator, and a frame synchronization signal is detected.
The auxiliary signal can be supplied to the transmission path encoding device at a predetermined timing based on the timing at which the frame synchronization signal is detected.

Further, in the signal processing method for digital broadcasting according to a fourth aspect of the present invention, a unique word included in a data sequence input to a transmission line coding apparatus by forming a super frame including a plurality of frames is described. A detecting step of detecting, and generating an auxiliary signal for specifying a superframe configuration of a data string input to the transmission path encoding device, based on a timing at which a unique word is detected in the detecting step, a predetermined And supplying an auxiliary signal to the transmission line encoding device at a timing.

Further, a signal processing method for digital broadcasting according to a fifth aspect of the present invention includes a BS (Broadcasting Satellite).
lite) Receives a data stream having a super frame structure for digital broadcasting from a stream generator, detects a frame synchronization signal included in the data stream, and synchronizes with the super frame by a counting operation based on the timing of detecting the frame synchronization signal. Establishing and supplying a data sequence received from the stream generator to the transmission line encoding device, and at a predetermined timing, supplying an auxiliary signal for specifying a superframe configuration to the transmission line encoding device. Features.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital broadcast interface device according to an embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a configuration of a digital broadcast interface device 2 according to an embodiment of the present invention, and a stream generator 1 and a transmission path encoding device 3 connected via the digital broadcast interface device 2. FIG. 4 is a diagram showing a flow of data between them.

The stream generator 1 is composed of a data generator, a data recorder and the like, and has a BS (Broadcasting).
Satellite) Records or outputs a data stream for digital broadcasting.

FIG. 2 is a diagram showing a configuration of a data string output from the stream generator 1. As shown in FIG. As shown in the figure, the data sequence output from the stream generator 1 forms a super frame composed of eight frames, and one super frame contains 78336 bytes of data.

Each frame includes 48 slots each composed of 204 bytes of data. Here, the first one byte of the first slot (slot # 1) and the second slot (slot # 2) of each frame is a frame synchronization signal W1 serving as a unique word indicating the start of the frame. More specifically, the first byte of the first slot (slot # 1) of each frame is 16 bytes.
It is data indicating “1B” in hexadecimal notation, and the first byte of the second slot (slot # 2) of each frame is 16 bytes.
This is data indicating "95" in base notation. The first byte in the third slot (slot # 3) to the tenth slot (slot # 10) of each frame is a TMCC (TMCC) for controlling a transmission system such as information on a plurality of multiplexed modulation schemes. Transmission and Multi
plexing Configuration Control).

The first byte of the eleventh slot (slot # 11) and the twelfth slot (slot # 12) of each frame is a frame synchronization signal W which is a unique word indicating the position of each frame in the superframe.
2, W3. More specifically, the first (first) frame of the superframe configuration includes the frame synchronization signal W2, and the first byte of the eleventh slot (slot # 11) indicates “A3” in hexadecimal notation. , Twelfth
The first byte of the slot (slot # 12) indicates "40" in hexadecimal notation. Frames other than the head of the superframe configuration include a frame synchronization signal W3,
The first byte of the eleventh slot (slot # 11) is 1
Hexadecimal notation indicates “5C”, and the first byte of the twelfth slot (slot # 12) indicates “BF” in hexadecimal notation.

The structure of the data string in each slot is as follows. That is, the first byte of each slot is
The synchronization byte used to identify the frame structure and establish synchronization, and the following 187 bytes are M bytes.
PEG-2TS (Moving Picture Expert Group phase2
Transport Stream) packet data, and the last 16 bytes are an outer code added by RS (Reed-Solomon) encoding.

The digital broadcast interface device 2 shown in FIG. 1 is an interface for inputting a data sequence output from the stream generator 1 to the transmission line encoding device 3, and includes a synchronization pattern detection unit 10 and an auxiliary signal generation unit. 11 is provided.

The synchronization pattern detector 10 detects a unique word included in a data stream for BS digital broadcasting from a data stream received from the stream generator 1. For example, the synchronization pattern detection unit 10
Detects the frame synchronization signals W1, W2, and W3 from the data sequence constituting the superframe shown in FIG. The synchronization pattern detection unit 10 outputs the frame synchronization signal W
When 1, W2 and W3 are detected, a detection signal notifying that these signals have been detected is sent to the auxiliary signal generation unit 11.

The auxiliary signal generation unit 11 specifies the superframe configuration of the data string output from the stream generator 1 based on the timing at which the detection signal is received from the synchronization pattern detection unit 10, An auxiliary signal indicating frame synchronization is supplied at a predetermined timing. For example, the auxiliary signal generation unit 11 sends the first frame synchronization signal W1 in the superframe configuration of the data sequence output from the stream generator 1 to the transmission path encoding device 3 at the timing of inputting a 1-byte time length. Provides a superframe synchronization signal. Further, the auxiliary signal generation unit 11 includes a counter 20 for specifying a timing at which an auxiliary signal is supplied to the transmission path encoding device 3.

The counter 20 includes a synchronous pattern detector 10
Is to establish synchronization with a superframe formed by the data sequence output from the stream generator 1 by a counting operation based on a detection signal sent from the stream generator 1 at a constant period. That is, the counter 20 performs a counting operation in synchronization with the detection signal sent from the synchronization pattern detection unit 10, and establishes synchronization with a superframe formed by the data sequence.

The transmission path encoding device 3 is an encoder that performs transmission path encoding corresponding to BS digital broadcasting. For example, the transmission path encoding apparatus 3 performs convolutional encoding on a data sequence output from the stream generator 1 to convert an inner code. Add.

The operation of the digital broadcast interface device 2 according to the embodiment of the present invention will be described below.
The digital broadcast interface device 2 detects a predetermined unique word included in the data string received from the stream generator 1 and establishes synchronization with the superframe, and provides the transmission path encoding device 3 with an auxiliary signal indicating frame synchronization. It is a device that can supply signals.

Digital broadcast interface device 2
Receives the data sequence from the stream generator 1, sends it to the transmission path encoding device 3, and the synchronization pattern detection unit 10 detects the frame synchronization signals W1, W2, and W3 included in the data sequence as unique words. .

Each time the synchronization pattern detection section 10 detects the frame synchronization signals W1, W2, W3, it sends a detection signal indicating that these are detected to the auxiliary signal generation section 11.

Upon receiving the detection signal from the synchronization pattern detection unit 10, the auxiliary signal generation unit 11 causes the counter 20 to perform a count operation in synchronization with the timing of receiving the detection signal. Thus, the counter 20 establishes synchronization with the superframe.

Here, the synchronization pattern detection section 10 sends a detection signal to the auxiliary signal generation section 11 every time it detects the frame synchronization signals W1, W2, W3. Therefore, the counter 2
Even if the synchronization with the superframe is lost at 0, if the subsequent data is normal, the frame synchronization can be immediately re-established.

When the counter 20 establishes synchronization with the superframe, the auxiliary signal generation unit 11 specifies the timing at which the auxiliary signal is supplied to the transmission path coding device 3 based on the counting operation of the counter 20. For example, by monitoring the count value of the counter 20, the auxiliary signal generation unit 11 specifies the timing at which the data located at the head of the superframe configuration is input to the transmission path encoding device 3.

The auxiliary signal generation unit 11 supplies an auxiliary signal indicating frame synchronization to the transmission line encoding device 3 at the same timing as the timing of the input of the leading data to the specified transmission line encoding device 3. The auxiliary signal may be, for example, a high-potential signal whose pulse width corresponds to one byte time. Thereby, the transmission path encoding device 3 can receive the auxiliary signal for specifying the frame configuration of the data sequence output from the stream generator 1. Therefore, the transmission path encoding device 3 includes the stream generator 1
Can not supply an auxiliary signal indicating frame synchronization for BS digital broadcasting, it is possible to specify the superframe configuration of the input data sequence.

As described above, according to the digital broadcast interface apparatus 2 of the present invention, a unique word included in a data stream for BS digital broadcast is detected from a data stream output from the stream generator 1. The superframe configuration can be specified, and an auxiliary signal indicating frame synchronization can be supplied to the transmission path encoding device 3. Thereby, the stream generator 1
It supports existing digital broadcasting systems such as DVB and CS digital broadcasting, and generates an appropriate auxiliary signal even when an auxiliary signal indicating frame synchronization for BS digital broadcasting cannot be supplied to the transmission path encoder 3. Can be supplied.

The present invention is not limited to the above embodiment, and various modifications and applications are possible. For example, in the above embodiment, the synchronization pattern detection unit 10 specifies the frame configuration of the data sequence by detecting a unique word such as a frame synchronization signal included in the data sequence for BS digital broadcasting, but is not limited thereto. Instead, the frame configuration may be specified by detecting arbitrary data periodically included in the data string. Also, the timing at which the auxiliary signal generation unit 11 supplies the auxiliary signal to the transmission path encoding device 3 is not limited to the timing corresponding to the head of the superframe, and may be supplied at any timing at which the frame configuration can be specified. It may be.

[0039]

As described above, the present invention detects a predetermined unique word included in a data stream, establishes synchronization with a superframe formed by the data stream, and outputs an auxiliary signal indicating frame synchronization. It can be supplied to a transmission line encoding device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a digital broadcast interface device according to an embodiment of the present invention and a flow of data between a stream generator and a transmission line encoding device.

FIG. 2 is a diagram showing a configuration of a data string output from a stream generator.

FIG. 3 is a diagram showing a configuration of a conventional data stream for digital broadcasting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stream generator 2 Digital broadcasting interface device 3 Transmission line coding device 10 Synchronization pattern detection unit 11 Auxiliary signal generation unit 20 Counter W1, W2, W3 Frame synchronization signal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryo Kosegawa 1-14-6 Dogenzaka, Shibuya-ku, Tokyo F-term in Kenwood Corporation (Reference) 5K028 AA06 BB05 CC05 DD01 DD02 EE03 KK12 KK32 MM17 NN02 5K030 GA08 HB02 HB15 HB28 JL02 LA15 LD07 5K047 AA15 CC08 DD02 HH02 HH12 HH44 MM03 MM56

Claims (8)

[Claims] 1. A detecting means for detecting a unique word included in a data sequence which is a data sequence constituting a superframe composed of a plurality of frames and which is input to a transmission path encoding device; Auxiliary signal supply for generating an auxiliary signal for specifying a superframe configuration of an input data sequence, and supplying the auxiliary signal to the transmission path encoding device at a predetermined timing based on a timing at which the detecting means detects a unique word. Means for digital broadcasting. 2. The digital broadcast interface device according to claim 1, wherein the unique word detected by the detection means is a frame synchronization signal included in a predetermined position in a data string. 3. The auxiliary signal supply means includes count means for establishing synchronization with a superframe by a count operation based on a timing at which the detection means detects a unique word. 3. The digital broadcast interface device according to 2. 4. The auxiliary signal supply means specifies a superframe configuration at a timing at which head data in a superframe configuration of a data sequence input to the transmission channel encoding device is input to the transmission channel encoding device. The digital broadcast interface device according to claim 1, 2 or 3, wherein an auxiliary signal for performing the operation is supplied to the transmission line encoding device. 5. A frame synchronization is established by detecting a unique word contained in a data stream for a BS (Broadcasting Satellite) digital broadcast, and performing a counting operation based on the timing at which the unique word is detected. A digital broadcast interface device, which supplies an auxiliary signal indicating the following to a transmission line encoding device. 6. A data stream having a superframe configuration for a BS (Broadcasting Satellite) digital broadcast is received from a stream generator, a frame synchronization signal included in the data stream is detected, and a count based on the timing at which the frame synchronization signal is detected. The operation establishes synchronization with a superframe, supplies a data sequence received from the stream generator to a transmission line encoding device, and, at a predetermined timing, transmits an auxiliary signal for specifying a superframe configuration to the transmission line encoding device. An interface device for digital broadcasting, which is supplied to a digitizing device. 7. A detecting step of forming a super frame composed of a plurality of frames and detecting a unique word included in a data sequence input to the channel coding device, and a data input to the channel coding device. Creating an auxiliary signal for specifying the superframe configuration of the column, and supplying an auxiliary signal to the transmission line encoding device at a predetermined timing based on the timing at which the unique word is detected in the detection step. A signal processing method for digital broadcasting, comprising: 8. A data stream having a superframe configuration for a BS (Broadcasting Satellite) digital broadcast is received from a stream generator, a frame synchronization signal included in the data stream is detected, and a count based on the timing at which the frame synchronization signal is detected. The operation establishes synchronization with a superframe, supplies a data sequence received from the stream generator to a transmission line encoding device, and, at a predetermined timing, transmits an auxiliary signal for specifying a superframe configuration to the transmission line encoding device. A signal processing method for digital broadcasting, which is supplied to a digitizing device.