KR19980085992A - Satellite broadcasting record and playback device - Google Patents

Abstract

The present invention relates to a satellite broadcast recording and reproducing apparatus for performing an interface between a DVCR and a satellite broadcasting receiver to record and play a desired satellite broadcast. This function converts the PID into DVCR mode PID so that the interface between the DVCR and the satellite broadcasting receiver can be smoothly played to reproduce the desired satellite broadcasting.

Therefore, the present invention can decode the MPEG II transport stream signal reproduced during the reproduction of the satellite broadcast signal recorded by the DVHS VCR 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 performing an interface between a DVCR and a satellite broadcast receiver to record and reproduce a desired satellite broadcast.

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 composed of the NESC encoder 104 for outputting NTSC signals 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 NESC encoder 104 allows NTSC decoding of the signal output from the NESC 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 program map table is not included in the MPEG signal recorded and reproduced on the tape, the DVCR 110 cannot demultiplex it according to the PID of the MPEG signal reproduced.

That is, the satellite broadcasting receiver cannot reproduce the MPEG II transport stream signal during reproduction of the DVHS VCR.

In order to solve the above problems, the present invention adds a DVCR mode function to a satellite broadcast receiver and converts the PID of the reproduced MPEG signal into a DVCR mode PID to smoothly perform an interface between the DVCR and the satellite broadcast receiver to reproduce recorded satellite broadcasts. It is an object of the present invention to provide a satellite broadcast recording and reproducing apparatus.

In order to achieve the above object, a satellite broadcasting recording and reproducing apparatus according to the present invention includes a PID and an image corresponding to a satellite broadcast channel, a program map table to which PIDs (Packet Identifiers) allocated to a plurality of satellite broadcasting channels are mapped, and Tuning means for receiving a transport stream of a packet unit including an audio signal, recording and reproducing means for recording and reproducing a PID corresponding to a desired satellite broadcast and a transport stream including video and audio signals, and reproducing in the recording and reproducing means. PID conversion means for converting the PID of the transport stream into a reproduction mode PID so as to decode the transport stream, and the transmission stream and the PID conversion of the transmitted satellite broadcast output from the tuning means in accordance with an input reproduction mode selection signal. Satellite / re-selected output from selected transport streams output from the means From a transport stream of the satellite broadcast output from the satellite / playback mode selection means using the program map table and the corresponding PID and the playout mode PID according to a mode selection means, an input satellite channel selection signal and a playback mode selection signal. Demultiplexing means for demultiplexing a transport stream of a desired broadcast channel to output to said recording and reproducing means, and outputting a reproduced transport stream, and decoding means for decoding and displaying the transport stream output from said demultiplexing means; Characterized in that configured to include.

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;

5 is a detailed configuration diagram of the PID converter of FIG.

Explanation of symbols for the main parts of the drawings

200: satellite broadcast receiver 201: tuner

202: satellite / playback mode selector 203: demultiplexer

204: MPEG decoder 205: NESC encoder

210: DVCR 300: PID converter

321: synchronous detector 322: PID detector

323: comparator 324: PID generator

325: multiplexer 326: counter

331: delay 332: ora gate

333: latch

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, a DVCR 210, and a PID converter 300.

That is, the satellite broadcast recording and reproducing apparatus according to the present invention includes a satellite broadcast receiver including a tuner 201, a satellite / playback mode selector 202, a demultiplexer 203, an MPEG decoder 204, and an NESC encoder 205. 200, the DVCR 210, and the PID converter 300. As shown in FIG.

The tuner 201 includes a program map table to which PIDs assigned to a plurality of satellite broadcast channels are mapped, and a transport stream in a packet unit including a PID corresponding to a satellite broadcast channel and video and audio signals. Receive.

The DVCR 210 is a means for performing recording and reproduction, and records and reproduces a transport stream including PID and video and audio signals corresponding to a desired satellite broadcast output from the demultiplexer 203.

The PID converter 300 converts the PID of the transport stream into a playback mode PID so as to decode the transport stream reproduced by the DVCR 210 and outputs the PID to the satellite / playback mode selector 202.

The satellite / playback mode selector 202 converts the transport stream of the transmitted satellite broadcast output from the tuner 201 and the PID outputted from the PID converter 300 according to an input play mode selection signal. And select one of the reproduced transport streams to output to the demultiplexer 203, and use the transport stream of the satellite broadcast output from the tuner 201 as one input and from the PID converter 300. And a switch for selecting and outputting one input according to the reproduction mode selection signal inputted using the reproduced transport stream outputted as a type force.

The demultiplexer 203 transmits the satellite outputted from the satellite / playback mode selector 202 using the program map table, the corresponding PID, and the play mode PID according to the inputted satellite channel selection signal and the playback mode selection signal. A transport stream of a desired broadcast channel is demultiplexed from the transport stream of the broadcast and output to the recording and reproducing unit 210, and the reproduced transport stream is output. That is, when the satellite broadcast is selected by the reproduction mode selection signal, the demultiplexer 203 uses the program map table and the corresponding PID from the satellite / playback mode selection unit 202 according to the input satellite channel selection signal. Demultiplexes a desired broadcast channel from the transmitted transmission stream of the satellite broadcast, and outputs from the satellite / playback mode selector 202 using a play mode PID when a play mode is selected by the play mode selection signal. Output the reproduced transport stream.

The MPEG decoder 204 and the NESC encoder 205 are means for performing a decoding function so that MPEG and NTSC decoding and display of a transport stream or a reproduced transport stream of a desired broadcast channel output from the demultiplexer 203 can be performed. do.

Here, the PID is the lower 8 bits of the 16-bit data transmitted after the synchronization signal is transmitted in the transport stream as shown in FIG. 3, and the PID is composed of 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).

When the transport stream is tuned by the tuner 201, the transport stream is selected and output by switching of a switch constituting the satellite / playback mode selector 202. The output of the tuner 201 is selected to receive satellite broadcasting. The transport stream of the satellite broadcast selected and output by the satellite / playback mode selection unit 202 is input to the demultiplexer 203 and demultiplexed according to the PID and output. That is, since the reproduction mode selection signal selects satellite broadcasting at a low level, when the satellite channel selection signal selected by the user is input from the demultiplexer 203, the PID for selecting and outputting a transport stream of a corresponding broadcast channel corresponding thereto is selected. Will be used.

In other words, when the user selects a desired broadcast channel using the satellite channel selection signal, only the transport stream of the corresponding PID is selected using the program map table and output to the MPEG decoder 204 or the DVCR 210.

At this time, if the user only wants to display, the transport stream of the broadcast channel selected and output by the demultiplexer 203 is MPEG decoded by the MPEG decoder 204 and NTSC encoded by the NTSC encoder 205 and then displayed on the TV.

On the other hand, if the user wants to record and play, the transport stream of the broadcast channel selected and output from the demultiplexer 203 is input to the DVCR 210 which performs the record and play function and is recorded. At this time, the program map table is not recorded.

Next, a process of reproducing and displaying the satellite broadcast recorded through the DVCR 210 will be described below.

When the satellite broadcast of the desired channel is recorded and reproduced through the DVCR 210 as described above, the reproduced transport stream is input to the PID converter 300 to convert the PID into a fixed reproduction mode PID so that the demultiplexer 203 It is possible to select the reproduced transport stream.

That is, the PID converter 300 changes the PID of the reproduced transport stream output from the DVCR 210 to 200 and outputs the demultiplexer 203 to the demultiplexer 203 through the satellite / playback mode selector 202. The demultiplexer 203 selects and outputs a transport stream corresponding to PID 200.

At this time, since the PID consists of the audio PID and the video PID, the audio PID among the PIDs of the reproduced transport stream is changed to the reproduction mode audio PID, and the video PID among the PIDs of the reproduced transport stream is changed to the reproduction mode video PID.

In this way, the transport stream from which the PID is converted to the reproduction mode PID from the PID converter 300 is input to the satellite / regeneration mode selector 202 to be selected. That is, since the reproduction mode displays the reproduced transport stream, the reproduction mode selection signal becomes high level so that the output of the PID converter 300 can output the reproduced transport stream from the satellite / playback mode selector 202. Will be selected. The reproduced transport stream selected and output by the satellite / playback mode selector 202 is input to the demultiplexer 203 and is selected and output according to the playback mode PID. That is, since the reproduction mode selection signal selects a transport stream reproduced at a high level, the demultiplexer 203 demultiplexes only the reproduced transport stream including the reproduction mode PID regardless of whether the satellite channel selection signal is input or not and then decodes the MPEG decoder. Output to 203 so that it can be displayed.

For example, when the playback mode PID is 200, when the playback mode is selected, the demultiplexer 203 demultiplexes the transport stream having the PID of 200, that is, the played transport stream, to the MPEG decoder 204 regardless of the satellite channel selection signal. Will print.

Next, a detailed configuration and operation of the PID converter 300 will be described.

The PID converter 300 outputs from the sync detector 321 and the sync detector 321 which detects a sync signal from the transport stream reproduced by the DVCR 210 and outputs a sync pulse as shown in FIG. 5. PID detector 322 which detects PID from the transport stream of the previous packet reproduced by using the sync pulse, which is counted according to the output of the PID detector 322, and the enable signal EN is input whenever the PID of each transport stream is input. Counter based on the enable signal EN outputted from the counter 326 and comparing the PID detected from the PID detector 322 with the PID of the transport stream of the reproduced current packet. The PID inserter outputs the PID insertion signal and outputs the PID detection signal to the PID detector 322 if it is not the same two times in succession, and the PID insertion signal outputted from the comparator 323. The PID generator 324 for generating the reproduction mode PID and the PID of the transport stream of the reproduced current packet according to the output of the PID detector 322 as the reproduction mode PID outputted from the PID generator 324. It consists of a multiplexer 325 for converting and outputting.

Here, the PID detector 322 delays the sync pulse output from the sync detector 321 according to the input clock CLK and outputs the delay pulse 331 to the counter 326 and the multiplexer 325. Latches the PID of the transport stream of the regenerated previous packet according to an OR gate 332 for ORing the output of the delayer 331 and the PID detection signal of the comparator 323, and an output of the OR gate 332. And a latch 333 output to the comparator 323.

The counter 326 is reset according to the output of the delayer 331 and counts the clock CLK to output an enable signal EN whenever a transport stream of 188 bytes is input.

The clock CLK is a signal obtained by dividing a frequency signal of 27 MHz into four.

The operation of the PID converter 320 configured as described above will be described.

First, the transport stream reproduced by the DVCR 210 is input to the sync detector 321 to generate a sync pulse when a sync signal is detected. The synchronous pulse generated is input to the delay unit 322 and delayed by two clocks according to the clock CLK divided into four frequency signals of 27 MHz. In this case, the signal output after being delayed by the delay unit 331 is to enable the 8-bit PID valid in the reproduced transport stream to be latched to the latch 333.

That is, since the upper 5 bits of the PID input after the synchronization signal is input and the lower 8 bits should be converted to the fixed reproduction mode PID, the PID input is latched 5 bits after the synchronization pulse is generated. The delay unit 331 delays by two clocks according to the clock CLK.

When the high level pulse is input from the retarder 331, the OR gate 332 outputs a high level signal to the latch 333, and as a clock, the transport stream regenerated in the latch 333. Will latch the PID.

On the other hand, the signal output from the delay unit 331 resets the counter 326, and the counter 326 counts the clock CLK so that each time 188 bytes of each transport stream is inputted, the comparator ( The enable signal EN is output to the 323.

That is, while detecting the PID of the transport stream of the previous packet and latching it in the latch 333, the counter 326 acquires 188 bytes according to the clock CLK from the time when the PID of the transport stream of the previous packet is input. The comparator 323 is enabled when the PID of the transport stream of the current packet counted and reproduced is input.

When the enable signal EN is input as described above, the comparator 323 compares the PID of the transport stream of the previous packet with the PID of the transport stream of the current packet stored in the latch 333.

In this case, when the PID of the transport stream of the previous packet and the PID of the transport stream of the current packet are the same, a PID insertion signal is output to generate the PID in the PID generator 324 and the multiplexer 325. ) Changes the PID of the reproduced transport stream according to the signal output from the delay unit 331 and outputs the changed PID. That is, in the multiplexer 325, when a high level pulse signal is input from the delay unit 331, the 8-bit fixed PID output from the PID generator 324 is selected and output. Otherwise, the reproduced transmission is performed. The synchronous signal and the audio and video signals which are streams are output.

If the PID of the transport stream of the previous packet and the PID of the transport stream of the current packet are the same twice, the PID detection signal is output to the OR gate 332 and the latch 333 is generated. Enable to detect and latch PID from the reproduced transport stream.

On the other hand, since PID and video and audio PID exist, the PID generator 324 converts the video PID of the reproduced transport stream into a fixed reproduction mode video PID and converts the audio PID of the reproduced transport stream into a fixed reproduction mode audio PID. Fixed playback mode video PID and audio PID must be selected and output for conversion.

As described above, the satellite broadcasting recording and reproducing apparatus according to the present invention can decode the MPEG II transport stream signal reproduced during the reproduction of the DVHS VCR through the satellite broadcasting receiver, thereby extending the use range of the satellite broadcasting receiver. It works.

Claims (8)

Tuning means for receiving a transport map in a packet unit including a program map table to which PIDs (Packet Identifiers) allocated to a plurality of satellite broadcast channels are mapped and PIDs corresponding to the satellite broadcast channels transmitted and video and audio signals; Recording and reproducing means for recording and reproducing a transport stream including a PID corresponding to a desired satellite broadcast and a video and audio signal; PID conversion means for converting the PID of the transport stream into a reproduction mode PID so as to decode the transport stream reproduced by the recording and reproducing means; A satellite / playback mode selection means for selecting and outputting one of a transport stream of the transmitted satellite broadcast output from said tuning means and a reproduced transport stream output from said PID conversion means in accordance with an input playback mode selection signal; According to the inputted satellite channel selection signal and the reproduction mode selection signal, the desired broadcast channel may be selected from the transport stream of the satellite broadcast output from the satellite / reproduction mode selection means using the program map table and the corresponding PID and reproduction mode PID. Demultiplexing means for demultiplexing a transport stream to output to said recording and reproducing means and to output a reproduced transport stream; And And decoding means for decoding and displaying the transport stream output from said demultiplexing means. The method of claim 1, wherein the PID converter A sync detector for detecting a sync signal from the transport stream reproduced by the recording and reproducing means and outputting a sync pulse; A PID detector for detecting a PID from a transport stream of a previous packet reproduced using the sync pulse output from the sync detector; A counter counting according to the output of the PID detector and outputting an enable signal whenever a PID of each transport stream is input; Compares the PID detected from the PID detector with the PID of the transport stream of the reproduced current packet and outputs a PID insertion signal if it is the same and outputs the PID insertion signal two times in a row. A comparator for outputting a PID detection signal to the PID detector; A PID generator for generating the reproduction mode PID according to the PID insertion signal output from the comparator; And And a multiplexer configured to convert a PID of a transport stream of the reproduced current packet into a reproduction mode PID output from the PID generator and output the output according to the output of the PID detector. 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 3, wherein the PID detector A delayer for delaying a synchronous pulse output from the synchronous detector according to an input clock and outputting the synchronous pulse to the counter and the multiplexer; An OR gate for ORing the output of the delay and the PID detection signal of the comparator; And And a latch for latching the PID of the transport stream of the reproduced previous packet and outputting the PID to the comparator according to the output of the OR gate. The method of claim 4, wherein the counter And reset the clock according to the output of the delayer, and output an enable signal each time a 188-byte transport stream is input. The method of claim 2 or 4, wherein the clock is A satellite broadcasting recording and reproducing apparatus, characterized in that the signal is divided into four frequencies of 27 MHz. The method of claim 1 or 2, wherein the PID is A satellite broadcasting recording and reproducing apparatus, comprising a video PID and an audio PID. The method of claim 1, The satellite / playback mode selection means One input is selected according to the reproduction mode selection signal inputted by using the transmission stream of the transmitted satellite broadcast output from the tuning means as one input and the reproduced transmission stream output from the PID conversion means as the type power. Satellite broadcasting recording and reproducing apparatus, characterized in that consisting of a switch for outputting.