JP2003259308A - Electronic device and signal processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly decode video data even when a program is changed. <P>SOLUTION: The electronic device of this invention capable of receiving a transport stream from another device via a digital interface 31 is provided with: a detection means 29 for detecting whether or not discontinuous information is included in attached information in the transport stream received via the digital interface 31; a video decoder 24 for decoding video data included in the transport stream; and an audio decoder 25 for decoding audio data included in the transport stream, and when the detection means 29 detects the discontinuous information, buffer memories 24a, 25a associated with the video decoder 24 and the audio decoder 25 are cleared. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is based on the MPEG (Moving
The present invention relates to an electronic device and a signal processing method for receiving a video signal and an audio signal encoded by applying a high efficiency encoding technique such as Picture Image Coding Experts Group) from another device.

[0002]

2. Description of the Related Art In recent years, MPE has been used in the United States and European countries.
Applying high-efficiency coding technology such as G, it encodes video and audio signals and transmits them via communication satellites,
Systems that demodulate this on the receiving side are becoming widespread.

These systems require a dedicated receiving / demodulating device on the receiving side. In this receiving / demodulating device, a portion for selecting a transport stream of a desired channel from a transport stream in which data of a plurality of channels are multiplexed, and video data and audio of a desired program from the transport stream of the desired channel. It has a part for separating the data and a part for decoding the separated video data and audio data.

In this system, in the receiving / demodulating device, the multiplexed transport is carried out in order to enable the reception of the transport stream of the desired channel and the separation of the video data and the audio data of the desired program. PSI (Program S
pesific Information: Program specification information) and EPG
(Electronic Program Guide) or SI (Sevice Information) is added.

[0005]

Video tape recorders (hereinafter referred to as DVCRs) for encoding and recording / reproducing video signals and audio signals have been commercialized.
It has been considered to record / reproduce the video data and audio data of the above-mentioned digital broadcast on such a DVCR without decoding them (Kubota Yukio ed., Illustrated Digital Video Reader, pp.140-152, (Shares). ) Ohmsha, August 25, 1995).

According to the present invention, when the DVCR as described above continuously reproduces a plurality of digital broadcasting programs and inputs them into the above-mentioned receiving / demodulating device for decoding, the decoding is performed when the programs change. It is an object of the present invention to provide an electronic device and a signal processing method capable of quickly performing a digitizing operation.

[0007]

In order to solve the above-mentioned problems, the present invention provides a digital interface in an electronic device capable of receiving a transport stream from another device via the digital interface. Detecting means for detecting whether or not the discontinuity information is included in the additional information in the transport stream received via the video stream, the video decoder for decoding the video data included in the transport stream, and the transport stream. An audio decoder for decoding the included audio data is provided, and when discontinuity information is detected, the buffer memories associated with the video decoder and the audio decoder are cleared. Further, the present invention is a signal processing method for receiving a transport stream from another device via a digital interface, wherein discontinuity information is included in additional information in the transport stream received via the digital interface. Video data included in the transport stream is decoded by a video decoder, audio data included in the transport stream is decoded by an audio decoder, and when the discontinuity information is detected, the above video is detected. Enabled to clear the buffer memory related to the decoder and audio decoder.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An example in which the present invention is applied to a digital signal recording / reproducing apparatus will be described below.

First, a receiving / demodulating apparatus configured to receive and decode an MPEG digital signal reproduced by a digital signal recording / reproducing apparatus to which the present invention is applied will be described.

FIG. 4 is a block diagram showing the configuration of this receiving / demodulating device. This receiver / demodulator is based on IRD (Int
It is called egrated Receiver Decoder).

The receiving / demodulating device receives a RF signal sent from a down converter (not shown) and selects a transport stream of a desired channel, and a transport selected by the front end 21. Demultiplexer 22 for separating MPEG video data and MPEG audio data of a desired program and additional information from a stream, and demultiplexer 22
And a buffer memory 23 for temporarily accumulating data to be input and output through.

This receiving / demodulating apparatus includes an MPEG video decoder 24 for decoding the video data separated by the demultiplexer 22, an MPEG audio decoder 25 for decoding the audio data separated by the demultiplexer 22, and an MPEG video decoder 24. NTS that converts the video signal decoded by the method into an NTSC video signal
A C encoder 26, a D / A converter 27 that analogizes the output of the NTSC encoder 26, and a D / A converter 28 that analogizes the output of the MPEG audio decoder 25. MPEG video decoder 2
4 is provided with a buffer memory 24a for temporarily storing video data, and the MPEG audio decoder 25 is provided with a buffer memory 25a for temporarily storing audio data.

Further, the reception / demodulation device includes a microcomputer (hereinafter referred to as a microcomputer) 29 for controlling the operation of the entire device, a front panel 30, and MPEG video data, MPEG audio data, and additional information separated by the demultiplexer 22. Is transmitted to the outside, and a digital interface 31 for transmitting the MPEG video data, the MPEG audio data, and the additional information received from the outside to the demultiplexer 22 is provided.

The front end 21 is a tuner and a QPS.
It is composed of a K demodulator and an error correction circuit, and selects a transport stream of a desired channel designated by the user on the front panel 30 from the multiplexed transport streams of a plurality of channels and selects Q.
PSK demodulation and error detection / correction are performed.

FIG. 5 shows an example of a transport stream for one channel. As shown in this figure, a plurality of programs (here, program numbers 1 to 3 are shown) are multiplexed in the transport stream of one channel. Here, the program is a virtual broadcasting channel, and in the case of current broadcasting in Japan, for example, a broadcasting service such as NHK satellite No. 1 and NHK satellite No. 2 etc.

The data of each program has a predetermined length (18
It is packetized with 8 bytes) and has a header at the beginning. The header has a P for identifying the data.
ID (Paket Identification: packet ID)) is given.

From the transport stream of the desired channel selected by the front end 21, a packet containing additional information is temporarily written in the buffer memory 23 through the demultiplexer 22. Then, MPEG video data and MPEG audio data of a desired program are recognized and separated from this, and the video data is MP-processed.
MPE audio data to EG video decoder 24
Send to the G audio decoder 25. In FIG. 9, the video data and the audio data of program number 2 are separated.

At the time of this separation, the PID (packet ID) given to the packet is checked. If it is a PID that identifies the video data and audio data of the desired program, the MPEG video decoder 2
4 and MPEG audio decoder 25. In FIG. 9, the PID given to the video data of program number 2 is "xx", and the PID given to the audio data is "yy". A method of knowing the correspondence between the program number and the PID in the receiving / demodulating device will be described later.

The video data sent to the MPEG video decoder 24 is stored in the buffer memory 24a, read out as appropriate, and decoded. The decoded video data is converted into an NTSC video signal by the NTSC encoder 25, converted into an analog video signal by the D / A converter 26, and then supplied to an external monitor device (not shown). Also, the audio data sent to the MPEG audio decoder 25 is stored in the buffer memory 2
5a, read out and decoded as appropriate. The decoded audio data is converted into an analog audio signal by the D / A converter 28 and then supplied to a speaker (not shown) such as a monitor device.

As described above, the video signal and audio signal of the digital broadcast can be received, decoded and displayed on the monitor device.

Next, the additional information will be described. As described above, PSI may be included in the multiplexed bitstream.
(Program use information), EPG (electronic program guide) or SI (service information) is added. Here, PSI defined by MPEG and SI defined by DVB (DIgital Video Broadcasting) system which is a digital broadcasting in Europe will be described.

(1): PAT (Programme Association Tabl)
e) This table is specified by MPEG and has PID
(Packet ID) is 0. The main contents are the description of the PID of the NIT and the PID of the PMT described later.

(2): PMT (Programme Map Table) This table is also defined by MPEG, and the PID is determined by the PAT described above. The main contents are a description of the correspondence between the program number and the PID, and a description of the PID of the ECM (scramble data accompanying the program).

(3): CAT (Conditional Access Table) This table is also defined by MPEG, and the PID is 1.
Is. The main content is a description of EMM (scramble information for customers).

(4): NIT (Network Information Table) PID is 0010. The main contents are a description of the network name (satellite name, terrestrial transmission station, etc.) and a description of the modulation method and frequency for each transport stream (physical channel).

The following table is specified by DVB.

(5): BAT (Bouqust Association Table) PID is 0011. The main contents are the description of the name of the bouquet (program provider) and the destination country, the contents of the service regarding the transport stream (physical channel), and the CAS (Conditional Access Servic).
e System) method description.

(6): SDT (Service Description Table) PID is 0011. The main content of the transport stream (physical channel) is a description of the service ID and the name of the bouquet included in the service stream. Here, the service ID is the first or Nth NHK satellite.
It is a broadcasting channel such as the second satellite of HK satellite. That is, it is the same as the program number specified by MPEG.

(7): EIT (Event Information Table) PID is 0012. The main content is a description of the event ID, its start time, broadcast time, program content, and the like. Then, a transport stream ID and a service ID are described for each event ID. Here, the event is, for example, “7 o'clock news (December 1
It is a program such as "broadcast for daily broadcast".

(8): TDT (Time Data Table) PID is 0010. And the main content is the description of the information of the world standard time. Using this TDT, the time of a clock (not shown) in the apparatus can be adjusted.

(9): RST (Running Status Table) PID is 0013. The main content is a description of the execution status of the event. That is, the description such as before the start of a certain event, during the execution, and the end is described.

Next, the microcomputer 2 in the receiving / demodulating device
How the 9 processes the PSI and SI described above will be described.

First, in the receiving / demodulating device, constants and the like are set according to the method of each network. Since this information is described in NIT, the modulation method, frequency, bit rate, error correction method, etc. can be obtained for each transport stream. After setting, these pieces of information are stored in the EEPROM (not shown) of the microcomputer 29.

Next, an event is searched using the EIT. A unique event ID is given to each broadcast event, the name and contents of the broadcast program are described in the EIT together with the start time, and the transport stream I for each event is recorded.
D and the service ID are described. Therefore, the transport stream ID is discriminated from the EIT, the receiving / demodulating device is set using the constant of the transport stream obtained by NIT, and the transport stream of the desired channel is selected.

The processing for selecting the transport stream of the desired channel in the front end 21 has been described above. Next, the processing of the microcomputer 29 when sending the output of the demultiplexer 22 to the MPEG video decoder 24 and the MPEG audio decoder 25 will be described.

FIG. 6 shows an example of the transport stream input to the demultiplexer 22 and the PAT therein.
And the contents of PMT are shown. Further, FIG. 7 shows an internal configuration example of the buffer memory 23. FIG. 8 is a diagram showing the flow of this processing. Here, it is assumed that the program number 1 broadcast is selected.

First, as shown in step S1 shown in FIG. 8, the output of the front end 21 is demultiplexed by the demultiplexer 22.
Through the buffer memory 23. The buffer memory 23 has a storage area 23 for each data as shown in FIG.
Since A to 23C are defined, write in each area.

Next, as shown in step S2, the PAT is searched from the additional information written in the additional information area 23C of the buffer memory 23. This processing may be performed by searching for a packet with a PID of 0. As shown in FIG. 6 (2), PA
PID of PMT for each program is described in T. Here, the PID of PMT1 is “cc”, and PMT2 is
PID is described as "dd".

Therefore, next, a packet with a PID of "cc" is searched for. As a result, the PMT corresponding to program number 1
1 can be detected. As shown in FIG. 6 (3),
The PMT 1 describes the MPEG video data, MPEG audio data, and ECM PID of program number 1.

Therefore, when watching the broadcast of the program number 1, the packet having the PID of "aa" is read from the MPEG video data area 23A of the buffer memory 23 and sent to the MPEG video decoder 24 through the demultiplexer 22 to receive the MPEG audio data. Area 2
The packet with PID "ab" is read from 3B and sent to the MPEG audio decoder 25 through the demultiplexer 22. As shown in FIG. 5, at this time, only the data excluding the header is sent. Also, the scramble is decoded using the ECM information described in the packet with the PID of "xx".

When watching the program number 2, the packet with the PID "dd" is searched for in the same manner.
In this packet, as shown in FIG. 6 (4), video data, audio data, and EC of program number 2
The PID of M is described. Therefore, the packet with the PID of "ba" is read from the MPEG video data area 23A and sent to the MPEG video decoder 24, and the MPE
PID is "bb" from the G audio data area 23B
MPEG packets to read out the packet
Send to 5. Also, the scramble is decoded using the ECM information described in the packet whose PID is "zz".

The normal processing for decoding the transport stream input from the front end 21 has been described above. The receiving / demodulating device shown in FIG. 4 can further output the MPEG video data, the MPEG audio data, and the additional information separated by the demultiplexer 22 to an external recording / reproducing device, for example, a DVCR via the digital interface 31. Also, MPEG video data and MPEG output from an external recording / reproducing apparatus
The audio data and the additional information can be received via the digital interface 31 and sent to the demultiplexer 22. Next, these processes will be described.

First, the processing of the microcomputer 29 when transmitting the output of the demultiplexer 22 from the digital interface 31 to the outside will be described. Since most of this processing is the same as the normal processing described above, only different points will be described.

The MPEG video data and MPEG audio data are sent to the digital interface 31 with the packet header attached. That is, when the microcomputer 29 reads from the buffer memory 23, it reads the entire header and sends it to the digital interface 31 through the demultiplexer 22.

The PSI and SI are also sent to the digital interface 31 with the header attached. However, the PAT leaves only the PID designating the PMT of the selected program number and removes the others. For example, when the program number 1 is selected, only the PID of PMT 1 (“cc” in the case of FIG. 6) is left and the others are removed.

In this way, the digital interface 3
The data sent to 1 is sent out from here. The digital interface 31 is, for example, IEEE-139.
4 is compliant. In this case, the data is IEEE
-Output in a 1394 isochronous packet. The isochronous packet output from the digital interface 31 is sent to the external DVCR.

FIG. 9 shows the format of the above-mentioned isochronous packet. 2 in the tag field
When the bit is 012, 2 at the beginning of the data field
A quadlet common isochronous packet header (hereinafter referred to as a CIP header) is inserted. For the purpose of handling real-time data of digital audio / video signals of digital video equipment and digital audio equipment,
The value of tag is 01 ₂ . Figure 10 shows a CIP header when taking the value of the tag = 01 _2. In addition, FIG.
Shows an example of FMT (format type) allocation in the CIP header. In this embodiment, FMT =
It specifies the format of the MPEG signal transmission 100001 _2. Then, the MPEG data is put in the data block after the CIP header shown in FIG.

FIG. 1 is a block diagram showing the structure of a DVCR to which the present invention is applied. The DVCR has a function of encoding and recording / reproducing an analog video signal and a function of recording / reproducing an MPEG digital signal input from the outside.

First, recording / reproducing of an analog video signal will be described.

The DVCR to which the present invention is applied, in order to record an analog video signal, an A / D converter 1 for digitizing a video signal and a DCT (discrete cosine transform) for the output of the A / D converter 1. A data compression coding circuit 2 that performs data compression coding processing such as quantization and variable length coding, and a framing circuit 3 that frames the output of the data compression coding circuit 2.

This DVCR is a multiplexer 4 for synthesizing the output of the framing circuit 3 and video auxiliary data (VAUX data) created by a signal processing microcomputer 8 described later.
And an error correction code addition circuit 7 for adding an error correction code to the output of the multiplexer 4, and a channel encoder 6 for performing recording modulation processing on the output of the error correction code addition circuit 7.

Furthermore, the DVCR creates a VAUX data based on the output of the mode processing microcomputer 7 and the mode processing microcomputer 7 for generating the information signal such as the TV channel of the video signal and the recording date and time based on the user operation. And a signal processing microcomputer 8 for performing the above. Here, the VAUX data includes a TV channel, recording date and time, recording start position (REC START) and recording end position (REC END) on the video tape, and the like.

FIG. 2 shows the format of one track of the data output from the error correction code adding circuit 5. As shown in this figure, the video data and VAUX data are formed in 90-byte block units. This data undergoes recording modulation processing in the channel encoder 6, is amplified by a recording amplifier (not shown), and is recorded on a video tape (not shown) using a magnetic head (not shown). In an actual DVCR, audio data, subcode data and the like are recorded on a track in a time division manner together with video data and VAUX data.

The encoding and recording of the analog video input signal has been described above. Next, reproduction of the recorded video signal will be described.

The DVCR to which the present invention is applied is composed of a reproducing circuit 9 for reproducing waveforms of data reproduced from a video tape and amplified by a reproducing amplifier (not shown) and reproducing a data clock. A channel decoder 10 for recording and demodulating output data, and a channel decoder 1
Error correction circuit 11 for performing error correction processing on the output of 0
And video data and VAU from the output of the error correction circuit 11.
Demultiplexer 12 for separating X data and deframing circuit 1 for decomposing a frame of this video data
3, a data compression decoding circuit 14 that performs processing such as variable length code decoding, inverse quantization, and inverse DCT on the output of the deframing circuit 13, and the output of the data compression decoding circuit 14 is converted into an analog signal. D / to convert to analog video signal
And an A converter 15. The VAUX data separated by the demultiplexer 12 is sent to the signal processing microcomputer 8 and from there to the mode processing microcomputer 7.

Next, recording / reproducing of an encoded signal input from the outside will be described. This DVCR
Has a digital interface 16. The digital interface 16 has the same structure as the digital interface 31 in the receiving / demodulating device shown in FIG. Then, the IEEE-1394 packet is transmitted / received to / from the digital interface 31 of FIG.

Next, the operation of recording the MPEG data input from the digital interface 16 will be described. As described above, this MPEG data is transmitted in the isochronous packet from the digital interface 31 of the receiving / demodulating device of FIG.

First, in the digital interface 16, MPEG data, that is, MPEG video data, MPEG audio data, and additional information are separated from the isochronous packet. The separated data is sent to the multiplexer 4 through the switch SW1, where it is multiplexed with the VAUX data output from the signal processing microcomputer 8 and formed into the format of FIG. 2 by the error correction code adding circuit 5. That is, the MPEG video data, the MPEG audio data, and the additional information are all recorded in the video data recording area. The processing after the error correction code adding circuit 5 is the same as the recording of the analog video input signal described above.

Next, the processing for reproducing the MPEG data will be described. The processing at the time of reproduction is the same as that at the time of reproducing the video signal described above until the reproduction data is input to the demultiplexer 12. The reproduction data input to the demultiplexer 12 is separated into MPEG data and VAUX data here. Switch SW for MPEG data
2 to the digital interface 16. Further, the VAUX data is sent to the signal processing microcomputer 8.

In the digital interface 16, the MPE
The header shown in FIGS. 9 and 10 is added to the G data, and the G data is output to the outside as an isochronous packet.
This isochronous packet is input to the digital interface 31 of the receiving / demodulating device, where the original MPEG
Video data of MPEG, video data of MPEG, and additional information are extracted and written in the buffer memory 23 through the demultiplexer 22.

MPE written in the buffer memory 23
The processing of G video data and MPEG audio data is the same as the processing of these data in the transport stream input from the front end 21 described above. On the other hand, the PS written in the buffer memory 23
The microcomputer 29 processes I and SI as follows.

The PAT and PMT are used as they are. As described above, when the data is output from the receiving / demodulating device to the external DVCR, only the PID designating the PMT of the program number selected from the PAT is left and the others are removed. In the PAT in the data input from, only the PID designating the PMT of the program number being input is described. Therefore, PAT
Can be searched for the PMT, and the PMT can be read to read the MPEG video data and the MPEG audio data of the program being input. The read MPEG video data and MPEG audio data pass through the demultiplexer 22 and the MPEG video decoder 24 and M
It is sent to the PEG audio decoder 25, and thereafter, processed in the same manner as these data from the front end 21.

Regarding EIT, the actual and present of the program described in PAT
Decode only the (present) information and ignore the others. Here, “actual” means a transport stream of the selected channel, and “present” means that the selected program is currently being broadcast.

Regarding the RST, only those relating to the program described in the PAT are decoded and the others are ignored. Regarding SDT, only the actual one of the program described in PAT is decoded, and the others are ignored.

The NIT is necessary for the setting in the front end 21, but is not necessary in the demultiplexer 22, so it is ignored. Similarly, BAT is also ignored.

Regarding the TDT, when the reproduction signal of the external DVCR is input, the TDT in the reproduction signal indicates the time at the time of recording, and does not indicate the current time. Therefore, this TDT is ignore. As a result, it is possible to avoid a situation where the internal clock is set to the wrong time when the time is set.

Further, a case where a plurality of programs are continuously input from an external DVCR will be described. As described above, the microcomputer 29 looks up the PAT to find the PMT, looks at the PMT, and reads the MPEG video data and MPEG audio data of the program being input from the external DVCR. However, when the external DVCR continuously outputs a plurality of programs, the microcomputer 2
9 is a new PAT when the program is switched.
To find PMT and see the MPE of the switched program
G video data and MPEG audio data cannot be read. In addition, the MPEG video decoder 24
Since the MPEG audio decoder 25 uses the past data for the decoding process, when the program is switched, the buffer memories 24a and 25 are used.
Correct decoding cannot be performed unless the data of the program before switching remaining in a is cleared.

Similarly, regarding the SI, it is necessary to rewrite the SI in the buffer memory 23 when the program is switched to a different program of the transport stream.

Therefore, in the present embodiment, when the program reproduced by the DVCR changes, a flag for identifying it is provided in the header of the isochronous packet. That is, the discontinuity flag is provided in the bit b0 of the FDF in FIG.

This discontinuity flag is set to the "H (high)" level for a predetermined time (eg, 1 second) when the transport stream becomes discontinuous in the DVCR reproduction signal. Specifically, the signal processing microcomputer 8 includes a recording start position (REC START) and a recording end position (RE) in the reproduction VAUX data sent from the demultiplexer 12.
When the data indicating C END) is detected, the discontinuity flag is set to the “H (high)” level by notifying the digital interface 16.

In the receiving / demodulating device, when the discontinuity flag is detected by the digital interface 31, the microcomputer 29 detects the SI in the buffer memory 23.
Is given, and an instruction to clear the buffer memories 24a and 25a is given to the MPEG video decoder 24 and the MPEG audio decoder 25.

Further, in the present embodiment, even when the DVCR mode changes from stop (STOP) to reproduction (PB), the above-mentioned discontinuity flag is set to the "H (high)" level. Specifically, the mode processing microcomputer 7 sets the user's P
This is realized by detecting the B operation, transmitting it to the signal processing microcomputer 8, and instructing the digital interface 16 by the signal processing microcomputer 8. As a result, even when the DVCR is reproduced from the middle of the program, the data in the buffer memories 24a and 25a in the receiving / demodulating device can be cleared and the SI in the buffer memory 23 can be rewritten.

Further, in this embodiment, the variable speed reproduction flag is provided in the bit b1 of the FDF. This is DVC
This flag is set to "H (high)" level when the operation mode of R is slow and cue / review. During such variable speed reproduction, since only the MPEG I picture is valid data, the buffer memory 24a underflows, and as a result, the MP picture is read until the next I picture is decoded.
The output of the EG video decoder 24 is interrupted. Therefore, the receiving / demodulating device is configured so that when the variable speed reproduction flag is detected, the last decoded I picture is continuously output from the MPEG video decoder 24 until the next I picture is input.

The flags described above are shown in FIG. Here, NP is normal play data and TP is trick play data. In addition, NP1 → NP2 is
Indicates that the normal play program has changed.

[0075]

As described in detail above, the electronic device and the signal processing method according to the present invention are used when discontinuity information is detected in the additional information in the transport stream received through the digital interface. By clearing the buffer memories associated with the video decoder and the audio decoder, the video data can be correctly decoded even when the program is switched.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a DVCR to which the present invention has been applied.

FIG. 2 is a diagram showing a format for one track of data output from the error correction code addition circuit of FIG.

FIG. 3 is a diagram showing flags in a DVCR to which the present invention has been applied.

FIG. 4 is a block diagram showing a configuration of a receiving / demodulating device configured to receive an output of a digital signal recording / reproducing device to which the present invention is applied.

[Fig. 5] Fig. 5 is a diagram illustrating an example of a transport stream for one channel.

FIG. 6 is a diagram showing an example of a transport stream input to a demultiplexer and the contents of PAT and PMT therein.

7 is a diagram showing an internal configuration example of a buffer memory 3 in FIG.

FIG. 8 is a diagram showing a processing flow of a microcomputer when sending an output of a demultiplexer to an MPEG video decoder and an MPEG audio decoder.

FIG. 9 is a diagram showing a format of an isochronous packet.

10 is a diagram showing a CIP header when taking tag = 01 ₂ values.

FIG. 11 is a diagram showing an example of FMT allocation in a CIP header.

[Explanation of symbols]

5 error correction code addition circuit, 6 channel encoder, 7 mode processing microcomputer, 8 signal processing microcomputer, 9 reproduction circuit, 10 channel decoder, 1
1 error correction circuit, 16 digital interface

Continued front page    (72) Inventor Hisato Shima             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5C025 BA14 BA25 BA27 DA04 DA05                 5C053 FA22 GB04 GB06 GB37 HA21                       LA07                 5C063 AB07 CA23 CA36 DA07 DA13                       EB04 EB29

Claims (2)

[Claims] 1. An electronic device capable of receiving a transport stream from another device via a digital interface, wherein discontinuity information is included in additional information in the transport stream received via the digital interface. The discontinuity comprises: detection means for detecting whether or not it is included, a video decoder for decoding video data included in the transport stream, and an audio decoder for decoding audio data included in the transport stream. An electronic device characterized in that when information is detected, a buffer memory associated with the video decoder and the audio decoder is cleared. 2. A signal processing method for receiving a transport stream from another device via a digital interface, wherein discontinuity information is included in additional information in the transport stream received via the digital interface. Is detected, the video data included in the transport stream is decoded by the video decoder, the audio data included in the transport stream is decoded by the audio decoder, and when the discontinuity information is detected, , A signal processing method characterized in that a buffer memory associated with the video decoder and the audio decoder is cleared.