KR19980085993A - Satellite broadcasting record and playback device - Google Patents

Abstract

The present invention relates to a satellite broadcast recording and reproducing apparatus that can receive and watch satellite broadcasts while recording and reproducing other satellite broadcasts. Allows recording of broadcasts.

Therefore, the present invention can simultaneously record other broadcasts while watching one broadcast through the satellite broadcast receiver, thereby extending the use range of the satellite broadcast receiver.

Description

Satellite broadcasting record and playback device

The present invention relates to a satellite broadcast recording and reproducing apparatus for receiving and watching satellite broadcasts so as to record and reproduce other satellite broadcasts.

In general, satellite broadcasting is transmitted in the MPEG II method, and the MPEG II Transport Stream (TS) transmits several programs simultaneously. That is, in the MPEG II transport stream, a plurality of programs, for example, three programs A, B, and C, as shown in FIG.

In this case, when receiving and displaying or recording a desired program, only a corresponding transport stream packet is received and decoded. That is, when the user wants to display the program A, only the packets A0 and A1 corresponding to the program A are decoded among the MPEG II transport stream packets transmitted as shown in FIG. 1 (B). In order to display (B), only the packets B0 and B1 corresponding to the program B are decoded among the MPEGII transport stream packets transmitted as shown in FIG.

In order to receive the satellite broadcasts transmitted by the satellite broadcast receiver and display them on a TV or record them through a DVCR, a DVCR is connected to the satellite broadcast receiver and used as a satellite broadcast recording and playback device.

That is, in the conventional satellite broadcast recording and reproducing apparatus, as shown in FIG. 2, a tuner 101 for tuning satellite broadcast signals of a plurality of channels received through an antenna and a plurality of channels output from the tuner 101. Demultiplexer 102 for demultiplexing the satellite broadcast signal of each broadcast channel, MPEG decoder 103 for decoding the MPEG signal output from the demultiplexer 102, and decoding signal output from the MPEG decoder 103 By connecting the DVCR 110, which performs the recording and reproducing function, to the satellite broadcasting receiver 100 including the NTSC encoder 104, which outputs the NTSC signal to the TV, the satellite broadcasting signal can be recorded and reproduced.

In this case, the DVCR 110 is connected to the demultiplexer 102 of the satellite broadcast receiver 100 to record a satellite broadcast signal of a desired broadcast channel, and reproduces the recorded signal to the demultiplexer 102.

The operation of the conventional satellite broadcast recording and reproducing apparatus configured as described above will be described.

The satellite broadcast signal is received via an antenna, tuned in tuner 101 and demultiplexed in demultiplexer 102. Since the satellite broadcast signal is received by mixing programs of a plurality of broadcast channels as shown in FIG. 1, the satellite broadcast signal is separated for each broadcast channel by the demultiplexer 102.

In this case, a PID (Packet Identifier) is used, which is received after the synchronization signal in each MPEG transport stream as shown in FIG. That is, the MPEG transport stream is composed of 188 bytes so that the synchronization signal is carried in the first 16 bits and the PID in the lower 13 bits of the next 16 bits. The PID has a different value for each broadcast channel. The PID is demultiplexed by the demultiplexer 102 to output a satellite broadcast signal of a desired broadcast channel to the MPEG decoder 103. The MPEG decoder 103 decodes the MPEG signal output from the demultiplexer 102, and the NTSC encoder 104 allows NTSC decoding of the signal output from the NTSC encoder 103 to display on a TV.

On the other hand, the DVCR 110 records the MPEG signal output from the demultiplexer 102 on a tape. During recording and reproducing, the DVCR 110 reproduces the recorded MPEG signal and outputs the demultiplexer 102 for decoding. As such, the MPEG signal output from the DVCR 110 is multiplexed and decoded by the demultiplexer 102 and then displayed on the TV.

However, PIDs are different for each broadcast channel, and a program map table in which the PIDs of the broadcast channels are mapped is placed in the MPEG transport stream to distinguish them.

Therefore, when the user selects a broadcast channel, the PID corresponding to the selected broadcast channel is found in the program map table, and the MPEG transport stream of the packet corresponding to the PID is selected and output to the DVCR 110 for recording or the MPEG decoder for display. Output to (103).

However, since the conventional satellite broadcast recording and reproducing apparatus does not include the program map table in the MPEG signal recorded on the tape and reproduced, the DVSC 110 cannot demultiplex it according to the PID of the MPEG signal reproduced. There was a problem of disappearing.

In other words, even if the satellite broadcast is recorded, there is no program map table, which makes it difficult to reproduce the satellite broadcast.

An object of the present invention is to provide a satellite broadcasting recording and reproducing apparatus for adding a switch to a satellite broadcasting receiver to receive satellite broadcasting through a satellite broadcasting receiver and simultaneously record other broadcasting. .

In order to achieve the above object, the satellite broadcasting recording and reproducing apparatus according to the present invention includes a program map table to which PIDs (Packet Identifiers) allocated to a plurality of satellite broadcasting channels are mapped, and PIDs corresponding to a plurality of transmitted satellite broadcasting channels. Tuning means for receiving a transport stream of a packet unit including a video and audio signal, a program map table output from the tuning means and a transport stream of a desired satellite broadcast channel and the program as a transport stream of a plurality of satellite broadcast channels Satellite broadcast recording and reproducing means for recording and reproducing a map table, a transmitted program map table output from said tuning means according to an input satellite / reproduction mode selection signal, and a transport stream of a plurality of satellite broadcast channels and the satellite broadcast recording And a reproduced program map table output from the reproducing means; Mode selection means for selecting one of the transport streams, and a transport stream output from the mode selection means 203 using a channel map signal input, a program map table output from the mode selection means and a corresponding PID. Demultiplexing means for multiplexing, and decoding means for decoding and displaying a transport stream output from the demultiplexing means.

1 is a structural diagram of a typical multi-channel satellite broadcast transport stream

2 is a block diagram of a conventional satellite broadcast recording and reproducing apparatus;

3 is a detailed structural diagram of a general transport stream

4 is a block diagram of a satellite broadcasting recording and reproducing apparatus according to the present invention;

Explanation of symbols for the main parts of the drawings

200: satellite broadcast receiver 201: tuner

202: QAM decoder 203: mode selector

204 demultiplexer 205 MPEG decoder

206: NTSC encoder 300: satellite broadcast recorder and player

301: micom 302: program selector

303: smoothing processor 304: FEC

305: formatter 306: record and player

307: equalizer 308: deformatter

309: BEC 310: Smoothing Processor

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 4, the satellite broadcast recording and reproducing apparatus according to the present invention includes a satellite broadcast receiver 200 including a mode selector 203 and a satellite broadcast recorder and player 300 including a program selector 302. It consists of.

That is, the satellite broadcasting recording and reproducing apparatus according to the present invention includes a tuner 201, a quadrature amplitude modulation (QAM) decoder 202, a mode selector 203, a demultiplexer 204, an MPEG decoder 205, and an NTSC encoder. A satellite broadcast receiver 200 composed of 206, a microcomputer 301, a program selector 302, and a satellite broadcast recorder and reproducer 300 composed of a recording and reproducing section.

Here, the recording and reproducing unit includes a smoothing processor 303, a forward error corrector (FEC) 304, a formatter 305, a recording and reproducing device 306, an equalizer 307, a deformatter 308, a backward error corrector 309, the smoothing processor 310, the detailed function will be described below.

The tuner 201 transmits a packet unit including a program map table to which PIDs assigned to a plurality of satellite broadcast channels are mapped and PIDs corresponding to a plurality of transmitted satellite broadcast channels, and video and audio signals. Receive the stream.

The QAM decoder 202 QAM decodes a signal encoded by Quadrature Amplitude Modulation (QAM) and outputs the QAM decoder to the program selector 302 of the satellite broadcast recorder and player 300.

The mode selector 203 transmits a program map table output from the tuner 201 and a transport stream of a plurality of satellite broadcast channels and the satellite broadcast recorder and player 300 according to an input satellite / playback mode selection signal. By selecting one of the reproduced program map table and the transport stream output from the smoothing processor (310) of the), the transmitted program map table output from the tuner 201 and the transport stream of the plurality of satellite broadcast channels To select and output one input according to the satellite / playback mode selection signal inputted by using the reproduced program map table output from the satellite broadcast recorder and player 300 and the transport stream as a type power. Is done.

The satellite broadcast recorder and player 300 inputs a program map table output from the tuner 201 through the QAM decoder 202 and transport streams of a plurality of satellite broadcast channels as input streams. By recording and reproducing the program map table, the microcomputer 301 for selecting and recording a desired satellite broadcasting channel and the QAM decoder 202 from the tuner 201 under the control of the microcomputer 301. The program selector 302 and the program selector 302 which select the transport stream of the desired satellite broadcast channel and the program map table by using the program map table and the transport streams of the plurality of satellite broadcast channels. Process transport streams and program map tables to record and play back, and process replayed transport streams and program map tables And a recording and reproducing processing section for outputting to the mode selecting section 203.

Here, the recording and reproducing unit outputs the forwarding error correction (FEC) of the smoothing processor 303 and the smoothing processor 303 for smoothing the transport stream and the program map table output from the program selector 302 for recording. The output of the formatter 305 and the formatter 305 to format the output of the FEC 304 and to record on the tape. A recorder and player 306 for reproducing the recorded signal, an equalizer 307 for equalizing the signal reproduced in the recorder and player 306, and a deformatter 308 for deformatting the signal output from the equalizer 307 ), A BEC (Backward Error Corrector) 309 for error correcting a signal output from the deformatter 308, and a signal output from the BEC 309 to smooth the satellite broadcast. It is configured to a smoothing processor 310 to output to the mode selection unit 203 of the receiver 200.

The demultiplexer 204 demultiplexes the transport stream output from the mode selector 203 by using an input channel selection signal, a program map table output from the mode selector 203, and a corresponding PID. .

The MPEG decoder 205 and the NTSC encoder 206 are means for decoding and displaying the transport stream output from the demultiplexer 204. The transport stream of the desired broadcast channel output from the demultiplexer 204 or The reproduced transport stream can be displayed by MPEG decoding and NTSC coding.

As shown in FIG. 3, the PID is the lower 8 bits of the 16-bit data transmitted after the synchronization signal is transmitted in the transport stream, and includes a video PID and an audio PID.

The operation of the satellite broadcast recording and reproducing apparatus thus constructed will be described.

First, the process of receiving and displaying the transmitted satellite broadcast will be described.

The tuner 201 receives a transport stream in a packet unit, wherein the received transport stream consists of broadcast signals of a plurality of satellite broadcast channels in a packet unit. PIDs are allocated to each broadcast channel, and a program map table is provided. Included. Here, the program map table indicates which broadcast channel the transport stream of the currently transmitted packet is mapped to, respectively, assigned to a plurality of satellite broadcast channels. For example, in the program map table, the satellite broadcasting of channel 6 is 100, the satellite broadcasting of channel 7 is 110, the satellite broadcasting of channel 8 is 120, the satellite broadcasting of channel 9 is 130, etc. Shows the status of PID assigned to the channel.

Meanwhile, one transport stream is composed of 188 bytes, and as shown in FIG. 3, a 16-bit synchronous signal (SYNC), the lower 13 bits of the 16-bit PID, video, and audio signals are sequentially transmitted. PID is the lower 8 bits of 13 bits of data transmitted after the synchronization signal (SYNC).

Such a transport stream is tuned by the tuner 201 and QAM decoded by the QAM decoder 202 and then selected and output by switching of a switch constituting the mode selector 203. The reproduction mode selection signal goes low to select the output of the QAM decoder 202 to receive satellite broadcasts. The transport stream of the satellite broadcast selected and output by the mode selector 203 is input to the demultiplexer 204 and demultiplexed and output according to the PID. That is, since the satellite / playback mode selection signal selects satellite broadcasting at a low level, when the channel selection signal selected by the user is input from the demultiplexer 204, a transmission stream of a corresponding broadcasting channel is selected and output. PID will be used.

In other words, when the user selects a desired broadcast channel using the channel selection signal, only the transport stream of the corresponding PID is selected using the program map table and output to the MPEG decoder 205.

As such, the transport stream of the broadcast channel output from the demultiplexer 204 is MPEG decoded by the MPEG decoder 204 and NTSC encoded by the NTSC encoder 205 and then displayed on the TV. In addition, the audio signal decoded by the MPEG decoder 205 is D / A converted by the audio D / A converter 207 and then output through the speaker.

On the other hand, if the user wants to record and reproduce, a plurality of transport streams and a program map table output from the tuner 201 through the QAM decoder 202 are input to the program selector 302. At this time, when the user wants to record and selects a program of a desired broadcast channel, the microcomputer 301 controls the program selector 302 to select a program of a desired broadcast channel.

That is, the transport stream output from the tuner 201 through the QAM decoder 202 is output as a packet unit by mixing several broadcasts as shown in FIG. 3. In order to record a program of a desired broadcast channel, You must choose a program.

When the user sets and inputs a program of a satellite broadcasting channel to be recorded, the microcomputer 301 controls the program selector 302 accordingly.

That is, when the program selector 302 is enabled for recording and the desired broadcast channel is selected by the control of the microcomputer 301, the PID is used to select and output the transport stream of the desired broadcast channel.

In other words, when the user selects the desired broadcast channel, the program selector 302 selects only the transport stream of the PID corresponding to the desired broadcast channel using the program map table and outputs the result to the smoothing processor 303.

The transport stream of the selected broadcast channel output from the program selector 302 is recorded by the recording and reproducing processor together with the program map table.

That is, the selected transport stream and the program map table output from the program selector 302 are smoothed for recording by the smoothing processor 303, and the FEC (FEC 304) allows error correction during recording and playback. After a Forward Error Correction process, the formatter 305 is formatted for writing on the tape and recorded on the tape in the recorder and player 306. At this time, the program map table is recorded on the tape together with the transport stream of the selected broadcast channel.

Next, a process of reproducing and displaying the satellite broadcast recorded through the satellite broadcast recorder and player 300 will be described.

When the bit stream corresponding to the satellite broadcast of the desired channel is recorded and reproduced in the recorder and player 306, the reproduced signal is equalized by the equalizer 307, deformatted by the deformatter 308, and then BEC. The error correction at 309 and the smoothing process at the smoothing processor 310 are output to the mode selector 203.

The reproduction signal output from the smoothing processor 310 of the satellite broadcast recorder and player 300 is selected and output by switching of a switch constituting the mode selector 203, and reproduces a display of the reproduced transport stream. In this mode, the satellite / playback mode selection signal is at a high level so that the output of the smoothing processor 310 is selected to play the transport stream.

The transport stream of the reproduced satellite broadcast selected and output by the mode selector 203 is input to the demultiplexer 204 and demultiplexed and output according to the PID. That is, since the satellite / playback mode selection signal selects a signal reproduced at a high level, the demultiplexer 204 receives a channel selection signal selected by the user, that is, a selection signal corresponding to a channel of the broadcast signal to be reproduced. PID is used to output a transport stream of a corresponding reproduced broadcast channel.

In other words, when the user selects the broadcast channel of the reproduced transport stream using the channel selection signal, the transport stream of the corresponding PID, that is, the reproduced transport stream, is selected and output to the MPEG decoder 205 using the reproduced program map table. Done.

The reproduced transport stream output from the demultiplexer 204 is thus MPEG decoded by the MPEG decoder 204 and NTSC encoded by the NTSC encoder 205 and then displayed on the TV. In addition, the audio signal decoded by the MPEG decoder 205 is D / A converted by the audio D / A converter 207 and then output through the speaker.

On the other hand, since PID and video and audio PID exist, in the program map table, two PIDs corresponding to a broadcast channel exist as audio and video, and both audio and video PIDs are mapped to one broadcast channel. Therefore, when demultiplexing the transport stream corresponding to the PID, the transport stream corresponding to the audio PID as well as the video PID should be demultiplexed.

As described above, the satellite broadcast recording and reproducing apparatus according to the present invention can simultaneously record other broadcasts while watching one broadcast through the satellite broadcast receiver, thereby extending the use range of the satellite broadcast receiver. .

Claims (5)

Tuning means for receiving a program map table to which PIDs (Packet Identifiers) allocated to a plurality of satellite broadcast channels are mapped, and a transport stream in a packet unit including PIDs and video and audio signals corresponding to a plurality of transmitted satellite broadcast channels. 201; Satellite broadcast recording and reproducing means (300) for recording and reproducing a transport stream of a desired satellite broadcast channel and the program map table by inputting a program map table output from the tuning means 201 and transport streams of a plurality of satellite broadcast channels. ); The transmitted program map table output from the tuning means 201 and the transport streams of the plurality of satellite broadcast channels and the playback output from the satellite broadcast recording and reproducing means 300 according to the inputted satellite / playback mode selection signal. Mode selection means (203) for selecting one of the programmed program map table and the transport stream; Demultiplexing means (204) for demultiplexing the transport stream output from the mode selection means (203) using an input channel selection signal, a program map table output from the mode selection means (203), and a corresponding PID ; And And decoding means (205, 206) for decoding and displaying the transport stream output from said demultiplexing means (204). The method of claim 1, wherein the mode selection means (203) The transmitted program map table output from the tuning means 201 and the transport streams of a plurality of satellite broadcast channels are input as inputs, and the reproduced program map table output from the satellite broadcast recording and reproducing means 300 is transmitted. And a switch for selecting and outputting one input according to a satellite / playback mode selection signal inputted using a stream as a type power. The method of claim 2, wherein the PID is A satellite broadcast recording and reproducing apparatus, characterized in that the lower 8 bits of the 16-bit data transmitted after the synchronization signal is transmitted in the transport stream. The method of claim 1 or 3, wherein the PID is A satellite broadcasting recording and reproducing apparatus, comprising a video PID and an audio PID. 2. The satellite broadcasting recording and reproducing means according to claim 1, A microcomputer 301 for selecting and recording a desired satellite broadcast channel; A program for selecting a transport stream of a desired satellite broadcast channel and the program map table by inputting a program map table output from the tuning means 201 and transport streams of a plurality of satellite broadcast channels according to the control of the microcomputer 301; Selector 302; And And a recording and reproducing processor for processing and recording and reproducing the transport stream and the program map table output from the program selector 302 and for processing and outputting the reproduced transport stream and the program map table to the mode selecting means 203. Satellite broadcast recording and playback device characterized in that