Apparatus and method for decoding data

• US 5,719,982 A
• Filed: 12/15/1995
• Issued: 02/17/1998
• Est. Priority Date: 12/15/1994
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kawamura, Makoto, Fujinami, Yasushi
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US08/573,516
• Time in Patent Office: 795 Days
• Field of Search: 386/65, 386/73, 386/95, 386/70, 386/125, 386/126, 386/46, 386/52, 386/69, 386/68, 360/13, 360/72.2, 369/47
• US Class Current: 386/241
• CPC Class Codes: G11B 11/10515 Reproducing compensating pit shift G11B11/1053
• CPC Class Codes: G11B 20/1251 for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/65 wherein solid state memory is used for storing indexing information or metadata
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/3036 Time code signal
• CPC Class Codes: G11B 27/3081 used signal is a video-frame or a video-field (P.I.P)
• CPC Class Codes: G11B 27/309 Table of contents
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• 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 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 7/52 Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal assembling of a multiplex stream by combining a video stream with other content or additional data, remultiplexing of multiplex streams, insertion of stuffing bits into the multiplex stream, assembling of a packetised elementary stream at server side H04N21/236; disassembling of a multiplex stream, remultiplexing of multiplex streams, extraction or processing of Service Information, disassembling of packetised elementary stream at client side H04N21/434
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8063 using time division multiplex of the PCM audio and PCM video signals

Abstract

Data decoding suitable for a compressed moving picture, audio information, and so forth recorded on a disc or the like. A pack header and a packet header are separated from information reproduced with the video signal; and a time code is extracted from the header of a GOP (Group of Pictures). Successive time codes are added to those pictures (B pictures and P pictures) of the GOP to which time codes have not been assigned.

Claims

1. Data decoding apparatus for decoding a data bit stream which includes picture data bits representing pictures and into which time codes have been intermittently inserted and assigned to predetermined pictures, comprising:

an extractor for extracting said inserted time codes from said data bit stream;

an interpolator responsive to said extracted time codes for interpolating successive time codes for those pictures in said data bit stream to which time codes have not been assigned;

an input device for inputting a time code to said interpolator;

a detector for detecting a time difference between said inputted time code and said successive time codes; and

means for displaying said successive time codes and said time difference.

2. The apparatus of claim 1, wherein said data bit stream is read from a movable record medium;

and further comprising a reproduction controller responsive to said time difference for controlling a search direction and a search speed of said record medium.

3. The apparatus of claim 1, wherein said data bit stream is received from a digital recording medium on which are recorded a sector area for storing data and table of content data (TOC) for enabling efficient access by sector address to data stored on said digital recording medium, said TOC data contains sector addresses of said predetermined pictures as well as said time codes corresponding to said sector addresses;

and wherein said apparatus further comprises means for inputting a time code, detecting means for detecting the sector address corresponding to a time code closest in value to said inputted time code, and searching means for searching said digital recording medium for said corresponding sector address.

4. The apparatus of claim 3, wherein said digital recording medium is a magneto-optic disc.

5. The apparatus of claim 3, wherein said digital recording medium is a magnetic disc.