JP2000209554A - Decoder and method for processing transport stream - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct proper processing by discriminating whether a reproduced transport stream is of a multiple program recording system or a signal program recording system in a digital broadcast reception and recording/reproducing system where a recording/reproducing device records/reproduces a transport stream from a digital broadcast receiver. SOLUTION: Whether or not a transport stream reproduced by a digital recording/reproducing device is a stream of a plurality of programs is discriminated by analyzing data of a program association table PAT of a reproduced signal from, e.g. a recording/reproducing device. When the stream consists of a plurality of the programs, the stream is discriminated to be the transport stream of the multi-program recording system, a video packet and an audio packet of a program with the smallest program number are selected from a plurality of the programs and decoded, or the transport stream is not decoded but video and audio data are muted and a warning indicating that reproduction is impossible is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, MPEG (Moving Picture)
Experts Group) Receiving and broadcasting / recording digital satellite broadcasts such as receiving a signal broadcasted by a two-system transport stream and recording / reproducing the transport stream on a recording medium such as a digital video tape, an optical disk or a magnetic disk. The present invention relates to a digital broadcast receiving apparatus used in a reproduction system and a method for processing a reproduced transport stream.

[0002]

2. Description of the Related Art In recent years, IEEE1394 has begun to spread as a digital interface for transferring video data and audio data between digital video equipment and digital audio equipment at high speed. IEEE
The 1394 supports an isochronous (Isochronous) transfer mode and an asynchronous (Asynchronous) transfer mode. In the isochronous transfer mode, a transmission delay time is guaranteed, which is suitable for high-speed transfer of a temporally continuous data stream such as video data or audio data. The asynchronous transfer mode guarantees that data is always transmitted to the destination node, and is suitable for reliably transferring data such as commands.

[0003] In recent years, digital satellite broadcasting has begun to spread. In digital satellite broadcasting, digital video data and audio data are compressed and packetized, and transmitted by an MPEG2 transport stream. A packet identifier called PID is provided in the header of the transmission packet. Then, video packets and audio packets of a plurality of programs are multiplexed and transmitted on the same stream.

When such a digital satellite broadcast is received, an IRD (Integrated Rec.
A decoder for receiving digital satellite broadcasts, which is called an "eiver Decoder", is connected. The digital satellite broadcast signal received by the parabolic antenna is supplied to the IRD.
The IRD demodulates an MPEG2 transport stream, extracts video and audio packets of a desired program from the MPEG2 transport stream by PID, and decodes video and audio signals from the video and audio packets. Is done. The video signal and the audio signal are supplied from the IRD to the television receiver.

It has been proposed that an IRD for receiving such digital satellite broadcasts be provided with a digital interface of IEEE 1394. IRD,
When an IEEE 1394 digital interface is provided, a system for receiving and recording / reproducing a digital satellite broadcast can be constructed by connecting an IRD to a device such as a recording / reproducing device. By constructing such a system, it becomes possible to record / reproduce the MPEG-2 transport stream transmitted by digital satellite broadcasting as it is.

That is, at the time of recording, the MPEG-2 transport stream received on the IRD side is based on the IEEE standard.
The data is sent to a recording / reproducing device via a digital interface of E1394. Then, the MPEG-2 transport stream is directly recorded on a recording medium by a recording / reproducing device. Then, at the time of reproduction, an MPEG2 transport stream is reproduced from the recording medium, and the reproduced MPEG2 transport stream is sent to the IRD via an IEEE1394 digital interface. In IRD, this MPEG
2 are decoded.

[0007]

As described above, when an IEEE 1394 digital interface is provided in the IRD, and the IRD and the recording / reproducing device are connected to construct a digital satellite broadcasting receiving and recording / reproducing system, the digital satellite broadcasting It is possible to record / reproduce the MPEG2 transport stream sent as described above on a recording medium such as a digital video tape, an optical disk or a magnetic disk.

In digital satellite broadcasting, packets of a plurality of programs are multiplexed and transmitted on the same carrier frequency. Therefore, as described above,
When recording / reproducing an MPEG2 transport stream sent by digital satellite broadcasting on a recording medium such as a tape cassette, the recording method is to extract video packets and audio packets of a desired one program on the IRD side. A single program recording system for recording by sending to a digital recording / reproducing device, and a multi-program for transmitting video packets and audio packets of a plurality of programs transmitted at one carrier frequency from an IRD to a digital recording / reproducing device and recording as it is A recording method is considered.

The multi-program recording method has an advantage that a plurality of programs can be recorded at the same time. However, if the multi-program recording method is adopted, a desired program can be selected from a plurality of program packets at the time of reproduction. A process for extracting the video packet and the audio packet is required, which confuses the user and complicates the process. Also, digital satellite broadcast programs are scrambled based on a reception contract, and if a multi-program recording method is adopted, the reception contract may not be complied with. For this reason, the currently considered IRD generally adopts a single program recording method.

However, the multi-program recording method has an advantage that a plurality of programs can be recorded at the same time. Further, considering multi-channels in the future, it is highly likely that the IRD which will appear in the future will adopt the multi-program recording method. .

As described above, when the IRD supporting the multi-program recording is put on the market, a recording medium recorded by the multi-program recording method and a recording medium recorded by the single-program recording method are mixed. For this reason, IRDs that do not support the multi-program recording method
A recording medium recorded by the multi-program recording method is mounted on a recording / reproducing apparatus connected by IEEE1394 and IEEE1394.
May be replayed. As described above, if a transport stream of the multi-program recording system is sent to an IRD that does not support the multi-program recording system, correct reproduction cannot be performed, which may confuse the user.

Accordingly, an object of the present invention is to determine whether a reproduced transport stream is of a multi-program recording type or a single-program recording type, and determine whether the reproduced transport stream is of a multi-program recording type or a single-program recording type. It is an object of the present invention to provide a digital broadcast receiving apparatus and a transport stream processing method capable of performing an appropriate process according to the above.

[0013]

According to a first aspect of the present invention, there is provided a receiving apparatus for receiving a digital broadcast signal, comprising: means for selecting a desired transmission channel from the received digital broadcast; For extracting a transport stream of a desired program from the demodulated transport stream, and an interface for transmitting and receiving the transport stream to and from the recording / reproducing apparatus. Means for determining whether or not the transport stream reproduced by the recording / reproducing apparatus and received via the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed. / Playback on the playback device When Nsu transport stream has a plurality of programs it is determined that multiplexed transport streams multiplexed is a receiving apparatus in a digital broadcasting to perform predetermined processing on the transport stream.

According to a tenth aspect of the present invention, a receiving apparatus for receiving a digital broadcast signal and a recording / reproducing apparatus are connected via an interface, and the recording / reproducing apparatus reproduces a transport stream recorded on a predetermined recording medium. In this case, the digital broadcast receiving apparatus determines whether the transport stream reproduced by the recording / reproducing apparatus and received via the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed, and When the transport stream reproduced by the reproducing apparatus is determined to be a multiplexed transport stream in which a plurality of programs are multiplexed, a predetermined processing is performed on the transport stream. It is.

MPE reproduced in recording / reproducing apparatus
It is determined whether the transport stream of G2 is of the single program recording system or of the multi-program recording system in the IRD. In the case of a transport stream of the multi-program recording system, for example, a video packet and an audio packet of a program with the smallest program number are extracted from a plurality of programs, and the video packet and the audio packet are decoded. In the case of a transport stream of the multi-program recording system, it is also possible to mute video and audio and display a warning that playback is not possible without decoding the transport stream. Accordingly, even when a recording medium recorded by the multi-program recording method is mounted on the recording / reproducing apparatus and the reproduced MPEG-2 transport stream is input to an IRD that does not support the multi-program recording method, the user is confused. Will not be given.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a digital satellite broadcast receiving and recording / reproducing system to which the present invention is applied.

In FIG. 1, 1 is an IRD, 2 is a digital video cassette recording / reproducing apparatus, and 3 is a television receiver. The IRD 1, the digital video cassette recording / reproducing device 2, and the television receiver 3 constitute a digital satellite broadcast receiving and recording / reproducing system. IRD1 and digital video cassette recording /
The playback device 2 has an IEEE 1394 digital interface, and the IRD 1 and the digital video cassette recording / playback device 2 are connected via an IEEE 1394 digital interface cable 8.

The IRD 1 decodes a received signal of a digital satellite broadcast and forms, for example, a video signal and an audio signal of the NTSC system. The antenna terminal of the IRD 1 is connected to a parabolic antenna 4 via a cable 6.
Is connected to the low-noise converter 5 attached to the. Radio waves from satellites are transmitted, for example, in the 12 GHz band. Radio waves from this satellite are
And is converted into a signal of, for example, a 1 GHz band by a low noise converter 5 attached to the parabolic antenna 4.

The output of the low noise converter 5 is supplied to the antenna terminal of the IRD 1 via the cable 6. IRD1
In, a signal of a desired carrier is selected from the received signals,
The MPEG-2 transport stream is demodulated.
Video packets and audio packets of a desired program are extracted from the transport stream, and the video packets and the audio packets are decoded. For example, video signals and audio signals of the NTSC system are decoded.

A video output terminal and an audio output terminal of the IRD 1 are connected to a video input terminal and an audio input terminal of the television receiver 3 via a cable 7. The video signal and the audio signal decoded by the IRD 1 are supplied to a video input terminal and an audio input terminal of the television receiver 3, and are supplied to the television receiver 3.
, A reception screen of a desired program is displayed and the sound thereof is output.

The digital video cassette recording / reproducing apparatus 2 can perform digital recording and analog recording on the same tape cassette. The IRD 1 and the digital video cassette recording / reproducing apparatus 2 are connected via a cable 8 of an IEEE1394 digital interface.

The video output terminal and the audio output terminal of the digital video cassette recording / reproducing device 2
It is connected to a video input terminal and an audio input terminal of the television receiver 3 via a cable 9. The antenna terminal of the digital video cassette recording / reproducing device 2
It is connected to a terrestrial antenna 10 via a cable 10.

In this system, the digital video cassette recording / reproducing apparatus 2 can record / reproduce an MPEG-2 transport stream based on the reception output of the digital satellite broadcast received by the IRD 1.
As a recording method at this time, a single recording method of extracting and recording a transport stream of one program from a plurality of transport streams is adopted.

That is, when the MPEG-2 transport stream from the IRD 1 is recorded by the digital video cassette recording / reproducing apparatus, a desired 1
Video packets and audio packets of the two programs are extracted and descrambled. MPEG comprising video packets and audio packets of this desired one program
2 is output from the IRD 1 and sent to the digital video cassette recording / reproducing device 2 via the IEEE 1394 digital interface.

The digital video cassette recording / reproducing apparatus 2 performs recording processing of an MPEG2 transport stream comprising video packets and audio packets of the desired one program, and the transport stream is recorded on the digital video cassette recording / reproducing apparatus. 2 is recorded on the tape cassette mounted on the tape cassette.

At the time of reproduction, MPEG recording is performed in a single recording mode.
The tape cassette on which the transport stream No. 2 is recorded is mounted on the digital video cassette recording / reproducing device 2, and the tape cassette is reproduced. The reproduced MPEG2 transport stream is based on IEEE1
IRD via 394 digital interface
Sent to 1.

The IRD 1 decodes the MPEG-2 transport stream to demodulate, for example, a video signal and an audio signal of the NTSC system. This signal is supplied to the television receiver 3,
The television receiver 3 displays a reception screen based on the MPEG-2 transport stream reproduced from the tape cassette mounted on the digital video cassette recording / reproducing apparatus 2 and outputs the sound.

The digital video cassette recording / reproducing apparatus 2 can perform analog processing on a terrestrial broadcast signal and record the processed signal on a mounted tape cassette.

When a terrestrial broadcast signal is analog-processed and recorded on a tape cassette, the terrestrial broadcast signal is received by the antenna 11, and the received signal is transmitted to the terrestrial wave in the digital video cassette recording / reproducing apparatus 2. It is supplied to a tuner circuit. In this terrestrial tuner circuit, a signal of a desired channel is selected, and an analog video signal and an audio signal are demodulated from the received signal. The analog video signal and the audio signal are analog-recorded on a tape cassette mounted on the digital video cassette recording / reproducing apparatus 2.

When reproducing a video cassette in which a video signal and an audio signal are analog-recorded, the video cassette is mounted on the digital video cassette recording / reproducing apparatus 2 and reproduced. In the digital video cassette recording / reproducing apparatus 2, the reproduced signal is transmitted to the television receiver 3 via the cable 9, and a reception screen based on the analog signal reproduced from the tape cassette is displayed on the television receiver 3. And the sound is output.

As described above, in this system, the IRD
The MPEG-2 transport stream from 1 can be recorded / reproduced by the digital video cassette recording / reproducing device 2, and the recording method at this time is as follows.
A single recording method for recording a transport stream composed of one program is employed. However, there is a possibility that a tape cassette recorded by a multi-program recording method in which a transport stream composed of a plurality of programs is recorded is mounted on the digital video cassette recording / reproducing apparatus 2.

In the embodiment of the present invention, when decoding the transport stream from the digital tape cassette recording / reproducing apparatus 2, the MPEG-2
It is determined whether the transport stream is of the single program recording type or of the multi-program recording type. If the transport stream is a single program recording system, video packets and audio packets of the program are extracted, and the video packets and audio packets are decoded. In the case of a transport stream of the multi-program recording system, video packets and audio packets of a program having the smallest program number among a plurality of programs are extracted, and these video packets and audio packets are decoded. For example, if the program number is “# 1”, “# 2”, or “# 3”, a video packet and an audio packet with the program number “# 1” are extracted, and the video packet and the audio packet are decoded.

As described above, when the transport stream transmitted from the digital video cassette recording / reproducing apparatus 2 is of the multi-program recording system, the program having the smallest program number among a plurality of programs is decoded. Even when a tape cassette recorded by the multi-program recording method is mounted on the digital video cassette recording / reproducing apparatus 2, it is possible to cope with this without giving any confusion to the user.

In the above example, the program with the smallest program number among the plurality of programs is decoded. However, the decoding is not limited to this.

FIG. 2 shows the configuration of the IRD 1. As shown in FIG. 1, for example, a digital satellite broadcast radio wave transmitted via a satellite in a radio wave of a 12 GHz band is received by a parabolic antenna 4, and a low-noise converter 5 attached to the parabolic antenna 4 outputs a 1 GHz radio wave. It is converted to a band signal. The output of the low noise converter 5 is supplied to the antenna terminal 21 of the IRD 1 via the cable 6. The signal from the antenna terminal 21 is supplied to a tuner circuit 22.

The tuner circuit 22 includes a frequency selection circuit for selecting a signal having a predetermined carrier frequency from the received signals,
A demodulation circuit for performing QPSK (Quadrature Phase Shift Keying) demodulation processing and an error correction processing circuit are provided. In the tuner circuit 22, a control CPU (Central Proc
A signal having a desired carrier frequency is selected from the received signals based on the setting signal from the essing unit (23).
This received signal is QPSK (Quadrature Phase Shift Key)
ing) Demodulated, and further subjected to error correction processing.

The output of the tuner circuit 22 is supplied to a descrambler 24. The received ECM (Entitlement Control Message) data and EMM (Entitlement Management Message) data are input to the descrambler 24, and the descrambler 24 stores the descrambled data stored in the IC card 25 inserted in the IC card slot 26. Key data is supplied. The descrambler 24 descrambles the MPEG transport stream using the received ECM data and EMM data and the key data of the IC card 25. The descrambled MPEG-2 transport stream is sent to the demultiplexer 27.

The demultiplexer 27 separates a desired packet from the stream from the descrambler 22 based on a command from the CPU 23. In the transmission packet, a packet identifier (PID) is included in a header portion.
Is provided. The demultiplexer 27
Based on D, video packets and audio packets of a desired program are extracted. The video packet of the desired program is sent to the MPEG2 video decoder 28,
The audio packet is sent to the MPEG audio decoder 29.

The MPEG2 video decoder 28 receives the video signal packet from the demultiplexer 27,
Video data is formed by performing an MPEG2 decoding process. This video data is supplied to the NTSC conversion circuit 30. In the NTSC conversion circuit 30, MPEG
The video data decoded by the video decoder 28 is N
It is converted to a TSC video signal.

A display control circuit 41 and a copy prohibition control circuit 42 are provided for the NTSC conversion circuit 30. The display control circuit 41 generates various display screens on the screen as needed. The display control circuit 41 can mute the entire screen as needed. The copy prohibition control circuit 42 generates a copy prohibition control signal as needed to protect the copyright of the video.

The output of the NTSC conversion circuit 30 is supplied to an analog video output terminal 31. The analog video output terminal 31 outputs an NTSC analog video signal.

The MPEG audio decoder 29 receives the audio packet from the demultiplexer 27,
The audio decoding process of the EG system is performed to form audio data before data compression. The decoded audio data is supplied to an analog audio output terminal 33 after being converted into an analog audio signal by a D / A converter 32. An analog audio signal is output from the analog audio output terminal 33.

An input to the IRD 1 is provided from an input unit 36. As the input unit 36, a remote controller 37 and a mouse 38 are prepared. Also, modem 3
5 is provided, and the billing information is sent by the modem 35 to a broadcasting station or a billing center via a telephone line.

The setting of the carrier frequency of the received signal is performed based on the channel setting signal input by the viewer.
When setting a desired program, NIT (Network
By referring to the Information Table, the receiving frequency of the tuner 51 is set to a predetermined carrier frequency. Then, by referring to a PAT (Program Association Table) which is information on a channel at the carrier frequency, a PMT which is information on a desired channel is referred to.
(Program Map Table) PID packet is extracted. By referring to this PMT, the PID of the video, audio, and additional data packet of the desired channel can be obtained.

The IRD 1 is provided with an IEEE 1394 digital interface 34. A transport stream can be input / output between the demultiplexer 27 and the IEEE 1394 interface 34. Digital video cassette recording /
When an MPEG2 transport stream is recorded by the reproducing apparatus 2, video packets and audio packets of a desired program are extracted by the demultiplexer 27. The MPEG2 transport stream including the video packet and the audio packet of the desired program is transmitted from the demultiplexer 27 to the IEEE 139.
4 to the digital video cassette recording / reproducing apparatus 2 via the digital interface 34 of FIG.

When the MPEG2 transport stream reproduced by the digital video cassette recording / reproducing apparatus 2 is decoded, the MPEG2 transport stream from the digital video cassette recording / reproducing apparatus 2 is converted to an IEEE1394 digital interface 34. And input to the demultiplexer 27
Sent to The demultiplexer 27 uses this MPEG2
Video packets and audio packets are separated from the transport stream. The video packet is MPEG2
The data is sent to the video decoder 28 and decoded. The audio packet is sent to the MPEG audio decoder 29 and decoded.

FIG. 3 shows a digital video cassette recording /
3 shows a configuration of the playback device 2. As described above, the digital video cassette recording / reproducing apparatus 2 can perform digital recording / reproduction and analog recording / reproduction. To perform digital recording / reproduction, a digital recording / reproduction circuit 52 and a channel encoder / decoder 53 are provided. To perform analog recording / reproduction, an analog recording / reproduction circuit 62 is provided.

The whole control is performed by the CPU 65. Further, an input for performing various operations is provided from input unit 66.

When the transport stream from IRD1 is recorded, MPE2 from IRD1 is recorded via digital interface 51 of IEEE1394.
Is input. This MPE
The G2 transport stream is digitally recorded /
It is supplied to the reproduction circuit 52. The digital recording / reproducing circuit 5 performs an error correction encoding process on the data of the transport stream. Digital recording /
The output of the reproduction circuit 52 is supplied to a channel encoder / decoder circuit 53 and modulated. The output of the channel encoder / decoder circuit 53 is supplied to the head 54. As a result, the tape 55 of the tape cassette attached to the digital video cassette recording / reproducing apparatus 2
The transport stream from RD1 is recorded.

When a tape cassette on which an MPEG-2 transport stream is recorded is reproduced, a reproduction signal of the tape 55 is reproduced by the head 54,
4 is supplied to the channel encoder / decoder 53 and demodulated. Channel encoder / decoder 5
3 is supplied to the digital recording / reproducing circuit 52. The digital recording / reproducing circuit 52 performs an error correction process. The output of the digital recording / reproducing circuit 52 is sent to the demultiplexer 27 of the IRD 11 via the digital interface 51 of IEEE 1394.

The demultiplexer 27 of the IRD 1 (FIG. 2)
Then, the transport stream is separated into video packets and audio packets. Video packets are MPE
The video signal is decompressed by a G2 video decoder 28, converted into an NTSC video signal by an NTSC conversion circuit 30, and sent from a video output terminal 31 to the television receiver 3. The audio packet is decompressed by an MPEG audio decoder 29 and converted to an analog signal by a D / A converter 32.
The audio signal is sent from the audio output terminal 33 to the television receiver 3.

In FIG. 3, when terrestrial broadcasting is recorded in analog form, the terrestrial reception signal is transmitted to the antenna input terminal 6.
0 and a signal from the antenna input terminal 60 is supplied to the terrestrial tuner circuit 61. The terrestrial tuner circuit 61 selects a desired broadcast reception signal, and demodulates, for example, an analog video signal and audio signal of the NTSC system from the reception signal. The analog video signal and the analog audio signal are supplied to an analog recording / reproducing circuit 62. In the analog recording / reproducing circuit 62, recording processing of a video signal and an audio signal is performed.
That is, the luminance signal is FM-modulated, the chroma signal is converted to a low frequency, and the audio signal is FM-modulated.
These signals are multiplexed and supplied to the head 54. The head 54 records an analog video signal and an audio signal on the tape 55 of the mounted tape cassette.

When reproducing the analog-recorded tape cassette, the signal of the tape 55 is reproduced by the head 54 and supplied to the analog recording / reproducing circuit 62. The analog recording / reproducing circuit 62 reproduces NTSC video and audio signals. That is, an FM-modulated luminance signal, a low-frequency conversion chroma signal, and an FM-modulated audio signal are extracted from the reproduced signal. F
An FM demodulation process is performed on the M-modulated luminance signal to demodulate the luminance signal.
Is returned to the chroma signal of the carrier frequency. An NTSC video signal is formed from the luminance signal and the chroma signal. Further, FM demodulation processing is performed on the FM modulated audio signal, and the audio signal is demodulated. The video signal and the audio signal are output from a video output terminal 63 and an audio output terminal 64.

In the embodiment of the present invention, when the transport stream reproduced by the digital tape cassette recording / reproducing apparatus 2 is decoded, the transmitted transport stream is of a single program recording type or a multi-program recording type. If the transport stream is a single-program recording transport stream, audio and video packets of the program are extracted, the video and audio packets are decoded, and a multi-program recording transport stream is determined. Then, a video packet and an audio packet of a program having the smallest program number among a plurality of programs are extracted, and the video packet and the audio packet are decoded. As a result, the tape cassette recorded by the multi-program recording method was mounted on the digital video cassette recording / reproducing apparatus 2, and when it was reproduced, the MPEG2 transport stream was input to the IRD that did not support the multi-program recording method. Even in this case, it can be dealt with without causing confusion to the user.

FIG. 4 shows the demultiplexer 27 at this time.
6 is a flowchart showing the processing of FIG. As shown in FIG. 4, first, the digital video cassette recording / reproducing device 2
Is decomposed by the demultiplexer 27 to extract the PID,
The AT is analyzed. From the information of the PAT, the program number transmitted in this stream and the number thereof are obtained (step S1).

It is determined from the PAT information whether or not the number of programs is singular (step S2). If the number of programs is singular, the program number is selected as the single program recording method (step S3), and the video packet and the audio packet of the program number are obtained and the decoding process is performed (step S4).

If the number of programs is not singular, the program number with the smallest value among the program numbers is selected (step S5), and the video packet and the audio packet of the program number are obtained and decoded (step S4). .

As described above, the PAT indicates the correspondence information between the program number of the program transmitted in the transport stream and the PID of the PMT relating to the program number. Therefore, it can be determined from the PAT information whether the transport stream is of the multi-program recording type or of the single program recording type. Note that the CPU 23 may determine whether the number of programs is singular based on the PAT information.

In the above-described embodiment, in the case of the transport stream of the multi-program recording system, the video packet and the audio packet of the program number with the smallest program number are extracted and decoded among a plurality of programs. If the transport stream is a multi-program recording system, the video may be muted without decoding.

That is, as shown in FIG. 5, the PAT is analyzed, and the program number transmitted in this stream and the number thereof are obtained from the PAT information (step S1).
1). It is determined from the PAT information whether the number of programs is singular (step S12). If the number of programs is singular, the program number is selected as the single program recording method (step S13), and the video packet and the audio packet of the program number are obtained and decoded (step S14). If the number of programs is not singular, a command from CPU 23
A mute signal is generated from the display control circuit 41 (step S14). Thereby, the video signal is muted. At this time, the sound may be muted.

Further, it may be displayed that a transport stream of a multi-program recording system cannot be reproduced. That is, as shown in FIG.
T is analyzed, and the program number sent in the stream and the number thereof are obtained from the PAT information (step S21). It is determined from the PAT information whether the number of programs is singular (step S22). If the number of programs is singular, it is a single program recording method,
The program number is selected (step S23), the video packet and the audio packet of the program number are obtained, and the decoding process is performed (step S24).
If the number of programs is not singular, the screen is muted by an instruction from the CPU 23 (step S2).
5), a display signal indicating that the reproduction cannot be performed due to the transport stream of the multi-program recording system is generated (step S26). Thus, a warning screen is displayed on the screen. Note that the CPU 23 may determine whether the number of programs is singular based on the PAT information.

In this embodiment, the case where the MPEG-2 transport stream from the IRD 1 is recorded / reproduced by the digital video cassette recording / reproducing apparatus 2 has been described. , A recording / reproducing device such as a CD-R or a hard disk.

[0063]

According to the present invention, when an MPEG-2 transport stream is reproduced from a recording / reproducing apparatus, the transmitted MPEG-2 transport stream is of a single program recording type or a multi-program recording type. Is determined. And if it is a transport stream of the multi-program recording method,
Video packets and audio packets of the program with the smallest program number among a plurality of programs are extracted,
The video packet and the audio packet are decoded.
In the case of a transport stream of the multi-program recording system, it is possible to mute video and audio and to display a warning that reproduction cannot be performed without decoding the transport stream. Thereby, the tape cassette recorded by the multi-program recording method is mounted on the digital video cassette recording / reproducing apparatus 2, and
Even when an MPEG2 transport stream is input to an IRD that does not support the multi-program recording method during reproduction, no confusion is given to the user.

[Brief description of the drawings]

FIG. 1 is a block diagram of an example of a digital satellite broadcast receiving and recording / reproducing system to which the present invention is applied.

FIG. 2 is a block diagram showing an example of an IRD in a digital satellite broadcast receiving and recording / reproducing system to which the present invention is applied.

FIG. 3 is a block diagram of an example of a digital video cassette recording / reproducing apparatus in a digital satellite broadcast receiving and recording / reproducing system to which the present invention is applied.

FIG. 4 is a flowchart used to describe an example of processing when a transport stream of a multi-program recording system is transmitted.

FIG. 5 is a flowchart used to explain another example of processing when a transport stream of a multi-program recording system is transmitted.

FIG. 6 is a flowchart used to describe still another example of a process when a transport stream of a multi-program recording system is transmitted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... IRD, 2 ... Digital video cassette recording / reproducing apparatus, 3 ... Television receiver

[Procedure amendment]

[Submission date] December 28, 1999 (1999.12.
28)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Title: Decoding device and transport stream processing method

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, MPEG (Moving Picture)
Experts Group) Receiving and broadcasting / recording digital satellite broadcasts such as receiving a signal broadcasted by a two-system transport stream and recording / reproducing the transport stream on a recording medium such as a digital video tape, an optical disk or a magnetic disk. The present invention relates to a decoding device used in a reproduction system and a method of processing a reproduced transport stream.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Accordingly, an object of the present invention is to determine whether a reproduced transport stream is of a multi-program recording type or a single-program recording type, and determine whether the reproduced transport stream is of a multi-program recording type or a single-program recording type. appropriate action is to provide a processing method for decoding apparatus and the transport stream allows digital broadcasting in accordance with the.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

According to the first aspect of the present invention, there is provided an image processing apparatus comprising:
Data and audio data are compressed and multiplexed
A decoding device that receives and decodes a transport stream.
Digital interface means for receiving
Discriminating means for judging whether the transport stream reproduced by the reproducing apparatus and received via the digital interface means is a multiplexed transport stream in which a plurality of programs are multiplexed, and reproduced by the reproducing apparatus by the discriminating means. When the transport stream is determined to be a multiplexed transport stream in which a plurality of programs are multiplexed, the decoding apparatus performs a predetermined process on the transport stream.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

According to a tenth aspect of the present invention, the video data and the
Transport with compressed and multiplexed audio data
Decoding device and playback device for receiving and decoding a stream
: It is connected through a digital interface, re
When reproducing a transport stream recorded on a predetermined recording medium by the raw device, the decoding device reproduces the transport stream, which is received by the reproducing device and received via the digital interface means, by multiplexing a plurality of programs. It is determined whether the transport stream is a multiplexed transport stream, and when it is determined that the transport stream played back by the playback device is a multiplexed transport stream in which a plurality of programs are multiplexed, predetermined processing is performed on the transport stream. This is a method of processing a transport stream to be performed.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/24 H04N 7/13 Z (72) Inventor Tatsuya Wakahara 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo No. 72 Inside Sony Corporation (72) Inventor Hajime Inoue 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Ichiro Hamada 6-35-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Soniー Inc.

Claims (15)

[Claims] 1. A receiving apparatus for receiving a digital broadcast signal, comprising: means for selecting a desired transmission channel from the received digital broadcast; and means for demodulating a transport stream transmitted by the selected transmission channel. Extracting means for extracting a transport stream of a desired program from the demodulated transport stream; interface means for transmitting and receiving a transport stream to and from a recording / reproducing apparatus; Discriminating means for discriminating whether or not the transport stream received through the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed. Played tiger A digital broadcast receiving apparatus for performing predetermined processing on a transport stream when it is determined that the transport stream is a multiplexed transport stream in which a plurality of programs are multiplexed. 2. The discriminating means analyzes a predetermined table in the transport stream, obtains the number of programs transmitted in the transport stream, and reproduces the data by the recording / reproducing apparatus. 2. The digital broadcast receiving apparatus according to claim 1, wherein it is determined whether or not the transport stream received via the PC is a multiplexed transport stream in which a plurality of programs are multiplexed. 3. The discriminating means analyzes a predetermined table in the transport stream, obtains a program number sent in the transport stream, and is reproduced by the recording / reproducing device. 2. The digital broadcast receiving apparatus according to claim 1, wherein it is determined whether or not the transport stream received via the multiplexed transport stream is a multiplexed transport stream in which a plurality of programs are multiplexed. 4. The method according to claim 3, wherein one of the plurality of programs is selected as the predetermined processing, and a transport stream corresponding to the selected program number is decoded. Digital broadcast receiver. 5. The digital broadcast receiving apparatus according to claim 4, wherein the program to be selected is the first program number among the plurality of programs. 6. The predetermined processing is performed when the discriminating means determines that the transport stream received via the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed. 2. The digital broadcast receiving apparatus according to claim 1, wherein decoding of a transport stream of the program is not performed. 7. The digital broadcast receiving apparatus according to claim 6, wherein a warning display is further performed as the predetermined processing. 8. The digital broadcast receiving apparatus according to claim 6, wherein at least one of a video signal and an audio is muted as the predetermined processing. 9. The digital broadcast receiving apparatus according to claim 1, wherein said interface means is connected to said extracting means. 10. A receiving device for receiving a digital broadcast signal and a recording / reproducing device are connected via an interface, and when the recording / reproducing device reproduces a transport stream recorded on a predetermined recording medium, In the digital broadcast receiving apparatus, it is determined whether or not the transport stream reproduced by the recording / reproducing apparatus and received through the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed. When the transport stream reproduced by the reproducing apparatus is determined to be a multiplexed transport stream in which a plurality of programs are multiplexed, a predetermined processing is performed on the transport stream. . 11. The method according to claim 1, wherein the predetermined processing is performed when the transport stream received via the interface means is determined to be a multiplexed transport stream in which a plurality of programs are multiplexed. 11. The transport stream processing method according to claim 10, wherein one of the programs is selected and a transport stream of the selected program is decoded. 12. The transport stream processing method according to claim 11, wherein the selected program has the first program number among the plurality of programs. 13. The predetermined processing is performed when the discriminating means determines that the transport stream received via the interface means is a multiplexed transport stream in which a plurality of programs are multiplexed. The transport stream processing method according to claim 10, wherein decoding of a transport stream of the program is not performed. 14. The transport stream processing method according to claim 13, wherein the predetermined processing further displays a warning. 15. The transport stream processing method according to claim 13, wherein in the predetermined processing, at least one of a video signal and an audio is muted.