Digital signal processor, processing method, digital signal recording/playback device and digital signal playback method

• US 20010001024A1
• Filed: 01/04/2001
• Published: 05/10/2001
• Est. Priority Date: 12/25/1995
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Shima, Hisato, Komuro, Teruyoshi, Yanagihara, Naofumi
• Granted Patent: US 6,442,330 B2
• Time in Patent Office: Days
• US Class Current: 386/75
• CPC Class Codes: H04L 12/40058 Isochronous transmission
• CPC Class Codes: H04L 12/40071 Packet processing; Packet format adaptation of digital video signals for transport over a specific network H04N21/2381, H04N21/4363, H04N21/4381; packet switches H04L49/00; intermediate storage or scheduling H04L49/90
• CPC Class Codes: H04L 12/40117 Interconnection of audio or video/imaging devices home automation networks H04L12/2803; bitstream network arrangements specially adapted for distribution of digital video signals H04N7/24
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/2368 Multiplexing of audio and video streams
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4341 Demultiplexing of audio and video streams
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/440281 by altering the temporal resolution, e.g. by frame skipping television signal recording using magnetic recording on tape for reproducing at a rate different from the recording rate H04N5/783
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 7/162 Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

To perform rapid decoding of video data and audio data when a plurality of programs continuously played back by a digital VTR and input from a digital interface are changed.

Also, to add data showing a program change when a plurality of digital broadcast programs are played back on a digital VTR, input to a digital broadcast receiver/demodulator and decoded.

A MPEG video decoder and MPEG audio decoder respectively decode MPEG video data and MPEG audio data separated by a demultiplexer. A digital interface sends and receives MPEG video data, MPEG audio data and supplementary data between the demultiplexer and external devices. The digital interface detects a flag indicating a discontinuity in a program from an input signal, and a microcomputer performs control so as to initialize the buffer memories.

When a signal processing microcomputer detects data indicating a recording start (REC START) position and recording end (REC END) position in playback VAUX data sent by a demultiplexer, this is notified to a digital interface. The digital interface generates a discontinuity flag identifying a program change in a header of an asynchronous packet into which video data from the demultiplexer is input.

Claims

1. A digital signal processor comprising:

first means for selecting a transport stream corresponding to any channel from a transport stream containing a plurality of multiplexed channels,

second means for separating video data and audio data in any desired program from said transport stream by referring to supplementary data in said selected transport stream,

third means for decoding said separated video and audio data,

fourth means for sending video data, audio data and supplementary data from external devices to said second means, and detecting data indicating a program discontinuity, and

fifth means for initializing said third means when said fourth means detects data indicating said program discontinuity.

2. A digital signal processor as defined in

claim 1

, wherein supplementary data in said second means is updated when said fourth means detects data indicating a program discontinuity.

5. A digital signal recording/playback device as defined in

claim 1

, further comprising fifth means for inputting an operating mode, and adding a second identifying data to the digital signal output by said first means when a speed change playback mode is specified.

3. A digital signal processing method, in a digital signal processor comprising first means for selecting a transport stream corresponding to any channel from a transport stream containing a plurality of multiplexed channels, second means for separating video data and audio data in any desired program from said transport stream by referring to supplementary data in said selected transport stream, third means for decoding said separated video and audio data, and fourth means for sending video data, audio data and supplementary data from external devices to said second means, and detecting data indicating a program discontinuity,

said third means is initialized when said fourth means detects data indicating a program discontinuity.

7. A digital signal playback method as defined in

claim 3

wherein a second identifying data is further added to said digital signal when speed change playback is performed.

4. A digital signal recording/playback device comprising:

first means for inputting/outputting a digital signal coded by a predetermined coding scheme,

second means for recording said digital signal transmitted by said first means in a recording medium,

third means for reproducing said digital signal recorded on said recording medium, and

fourth means for detecting a program change in said digital signal played back by said third means,

wherein said fourth means adds a first identifying data to the digital signal output by said first means when a program change is detected.

6. A digital signal playback method, wherein first identifying data is added to said digital signal when a program in said playback digital signal has changed, when a digital signal coded by a predetermined coding scheme is played back from a recording medium and output to an external device.