GB2067047A - Method and apparatus for data-rate reduction - Google Patents

Method and apparatus for data-rate reduction

Info

Publication number
GB2067047A
GB2067047A GB8102412A GB8102412A GB2067047A GB 2067047 A GB2067047 A GB 2067047A GB 8102412 A GB8102412 A GB 8102412A GB 8102412 A GB8102412 A GB 8102412A GB 2067047 A GB2067047 A GB 2067047A
Authority
GB
United Kingdom
Prior art keywords
signals
pcm
dpcm
sample
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8102412A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Independent Broadcasting Authority
Original Assignee
Independent Broadcasting Authority
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Independent Broadcasting Authority filed Critical Independent Broadcasting Authority
Publication of GB2067047A publication Critical patent/GB2067047A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

Pulse code modulated (PCM) signals are used to produce differential pulse code modulated (DPCM) signals and the (PCM) and (DPCM) are mixed and transmitted together as a composite signal whereby on reception all or substantially all the DPCM sample sites are reconstituted using only PCM signals as a basis. Preferably, every third sample transmitted is a PCM sample. The method and apparatus disclosed are suitable for use with composite PAL signals or with chrominance and luminance component signals.
GB8102412A 1979-07-06 1980-07-07 Method and apparatus for data-rate reduction Withdrawn GB2067047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7923666 1979-07-06

Publications (1)

Publication Number Publication Date
GB2067047A true GB2067047A (en) 1981-07-15

Family

ID=10506352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8102412A Withdrawn GB2067047A (en) 1979-07-06 1980-07-07 Method and apparatus for data-rate reduction

Country Status (2)

Country Link
GB (1) GB2067047A (en)
WO (1) WO1981000181A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60176365A (en) * 1984-02-22 1985-09-10 Dainippon Screen Mfg Co Ltd Compressing method of picture signal
US4719642A (en) * 1985-02-27 1988-01-12 Scientific Atlanta, Inc. Error detection and concealment using predicted signal values
FR2591050B1 (en) * 1985-12-04 1990-07-20 Thomson Cgr METHOD AND DEVICE FOR CONDITIONALLY ENCODING COMPRESSION OF DIGITAL IMAGES WITHOUT LOSS OF INFORMATION
JP2547730B2 (en) * 1986-01-27 1996-10-23 キヤノン株式会社 Data transmission system
JP2597987B2 (en) * 1986-02-08 1997-04-09 ソニー株式会社 Decoding device for block transmission signal
GB8612133D0 (en) * 1986-05-19 1986-06-25 British Broadcasting Corp Predictors for video signals
DE19840956C1 (en) * 1998-09-08 2000-02-24 Gerd Papajewski Looper for lower thread in double lock stitch sewing machine has extractor with magnetic attraction to pull the bobbin and upper section of the bobbin housing clear of the lower housing section

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403226A (en) * 1965-09-30 1968-09-24 Bell Telephone Labor Inc Reduced bandwidth dual mode encoding of video signals

Also Published As

Publication number Publication date
WO1981000181A1 (en) 1981-01-22

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)