JP2747298B2 - Data channel decoder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data channel decoder, and more particularly, to a bit stream of a data channel using a digital subcarrier of a satellite television and a data channel using a high-definition muse signal. The present invention relates to a data channel decoder that extracts data from a signal in packet units.

[Summary of the Invention] The present invention determines which of satellite broadcasting by the current television system and satellite broadcasting by the Hi-Vision Muse system is being performed, and provides a data channel signal of the satellite broadcasting of the determined system. By decoding, when satellite broadcasting by the current television system and satellite broadcasting by the Hi-Vision Muse system are performed continuously, it is possible to continuously receive services using both data channels. is there.

[Prior Art] FIG. 4 shows a signal format of a PCM audio transmission system using digital subcarriers of television satellite broadcasting. In this signal format, an area for multiplexing data called a data channel is provided. is there. In the data channel, for example, the data channel shown in FIG.
Various data broadcasting services can be provided by packetizing digital data such as an information service that complements the contents of a television broadcast program or an independent information service, for example, by packetizing and multiplexing as shown in FIG. it can. FIG. 7 shows an example of a data broadcasting system using a data channel.

Also, in the high-definition muse transmission system, a data channel region is provided in an audio / data frame signal region within a vertical blanking period of the video signal, for example, the audio / data frame signal region shown in FIG. To
Various data broadcasting services can be provided. Ninth
The figure shows the audio / data transmission format of the muse system, and FIG. 10 shows the multiplexed area of the data in the format shown in FIG.

Conventionally, as data channel decoders, there are a data channel decoder using a digital subcarrier of a satellite broadcast television and a data channel decoder of a data channel of a Hi-Vision muse signal, each of which is a dedicated decoder. Therefore, even if there are bit stream signals of two types of data channels, only one of them operates.

[Problems to be Solved by the Invention] However, when receiving two types of data channel services, one dedicated data channel decoder is prepared, and each time a signal is switched, connection with a receiving terminal of each service is made. The problem is that if satellite broadcasting by the current television system and broadcasting by the Hi-Vision Muse system are performed continuously, it is not possible to receive the service using the data channel continuously. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data channel decoder capable of solving the above problems and continuously receiving a service using two types of data channels.

[Means for Solving the Problems] In order to achieve such an object, the present invention determines which type of satellite broadcasting is being performed between satellite broadcasting using the current television system and satellite broadcasting using the Hi-Vision Muse system. And a decoding means for decoding a satellite broadcast data channel signal of the type determined by the determination means.

[Operation] In the present invention, it is determined by the determining means which of the satellite broadcasting by the current television system and the satellite broadcasting by the Hi-Vision Muse system is being performed by the determining means. The data channel signal of the satellite broadcast is decoded by the decoding means.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In the figure,
1 is a data service transmitting terminal, 2 is a multiplexer for multiplexing data, 3 is an audio encoder for encoding an audio signal, 4 is a modulator for modulating a video signal, 5 is an audio encoder for encoding an audio signal, and 6 is an audio encoder. A video encoder for encoding a high-definition video signal, 7 a switch for switching between the muse system and the current television system, 8 a transmitter,
9 is a transmitting antenna, 10 is a broadcasting satellite (BS), 11 is a receiving antenna, 12 is a satellite broadcast receiving tuner, 13 is a TV receiver, 14
Is a muse receiver, 15 is a Hi-Vision receiver, 16 is a data channel decoder, and 17 is a data service receiving terminal.

FIG. 2 shows a specific example of the data channel decoder 16 shown in FIG.

In the figure, a data channel decoder 16 includes an input determination unit 161 as a determination unit and a deinterleaving unit in a frame of a bit stream of a muse data channel.
162, a writing / reading control unit 163, a de-interleaving unit 164 for a bit stream of a digital subcarrier data channel of a satellite broadcast television, a writing / reading control unit 165, a changeover switch 166, and a packet data selection output unit 167. .

Decoding means is constituted by the intra-frame deinterleave units 162 and 164, the write / read control units 163 and 165, the changeover switch 166, and the packet data selection output unit 167.

 Next, the operation will be described.

When the bit stream signal generated by the muse receiver 14 or the satellite broadcast receiving tuner 12 is input to the data channel decoder 16, first, the input determination unit 161 determines whether it is a muse data channel signal or a satellite broadcast television. Is determined based on the clock frequency.

If the result of the determination is that the data channel signal is a muse data channel signal, the bit stream is written by the write / read control unit 163 to the deinterleave unit 162 in the Hi-Vision muse system frame, and at the same time, the changeover switch 166 is switched to the deinterleave unit 162 Can be On the other hand, if the result of the determination is that the data channel signal is of the digital subcarrier system of the satellite broadcast television, the bit stream writing / reading control unit 165 controls the deinterleave unit 16 in the frame of the current television system of the satellite broadcast.
4 and at the same time, the changeover switch 166 is switched to the deinterleave section 164.

Then, the packet data written in a predetermined position and order in the data channel area is sequentially read, and among the read packet data, packet data of an externally designated service is included in the packet header. The packet is selected by the packet data selection output unit 167 based on the service identification information, and is output to the receiving terminal 17 of various data services.

The determination of the data channel signal should be made by directly inputting the result of detecting the presence or absence of the digital subcarrier on the satellite broadcast receiving tuner 12 side and the result of detecting the presence or absence of the muse signal with the muse receiver to the decoder. You may.

 FIG. 3 shows a second embodiment of the present invention.

This embodiment is different from the first embodiment in the configuration of the data channel decoder. That is, the data channel decoder 16 of the first embodiment is
1. Although configured by the intra-frame deinterleave units 162 and 164, the write / read control units 163 and 165, the changeover switch 166, and the packet data selection output unit 167, the data channel decoder 18 of this embodiment includes an input determination unit 161 and an intra-frame deinterleave unit. 181, a write / read control unit 182 and a packet data selection output unit 167. As described above, the intra-frame deinterleave unit is shared for the two types of bit stream inputs, and the write / read control unit has a function of generating control signals for the two types of deinterleave. By 182, based on the determination information from the input determination unit 161, a control signal for intra-frame deinterleaving corresponding to the bit stream is supplied to the intra-frame deinterleave unit 181 and packet data is transmitted from the intra-frame deinterleave unit 181. Can be taken out. However, although the control of the deinterleaving in the frame is complicated, there is an advantage that the number of circuit elements can be reduced.

[Effects of the Invention] As described above, according to the present invention, when satellite broadcasting by the current television system and satellite broadcasting by the Hi-Vision Muse system are performed continuously, services using both data channels are continuously performed. There is an effect that can be received.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a data channel decoder according to a first embodiment of the present invention, FIG. 2 is a diagram showing a configuration of the data channel decoder shown in FIG. 1, and FIG. 3 is a diagram showing a second embodiment of the present invention. FIG. 4 is a block diagram showing a data channel decoder, FIG. 4 is a diagram showing a PCM audio transmission format of satellite broadcasting, FIG. 5 is a diagram showing a multiplexed area of data in a PCM audio transmission format of satellite broadcasting, and FIG. 6 is a data channel. FIG. 7 is a system diagram of a data broadcasting system using a data channel, FIG. 8 is a diagram showing a configuration of a muse video frame signal, and FIG. 9 is a muse audio / video system. FIG. 10 is a diagram showing a data transmission format, and FIG. 10 is a diagram showing a multiplexed area of data in a muse audio / data transmission format. 161, an input determination unit, 162, 164, a deinterleave unit in a frame, 163, 165, a write / read control unit, 167, a packet data selection output unit.

Claims (2)

(57) [Claims] 1. A judging means for judging which of satellite broadcasting by the current television system and satellite broadcasting by the Hi-Vision Muse system is being carried out, and the satellite broadcasting of the system judged by the judging means. A data channel decoder, comprising: decoding means for decoding a data channel signal. A decoding means for generating one of the two types of control signals for deinterleaving in accordance with the result of the judgment by the input judgment means; A deinterleaving unit within a frame that can be used in common for two types of data channel signals for deinterleaving a satellite broadcasting data channel signal of the type determined by the determination unit based on the control signal for deinterleaving. The data channel decoder according to claim 1, further comprising: