FR2408945A1 - Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds - Google Patents

Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds

Info

Publication number
FR2408945A1
FR2408945A1 FR7726773A FR7726773A FR2408945A1 FR 2408945 A1 FR2408945 A1 FR 2408945A1 FR 7726773 A FR7726773 A FR 7726773A FR 7726773 A FR7726773 A FR 7726773A FR 2408945 A1 FR2408945 A1 FR 2408945A1
Authority
FR
France
Prior art keywords
expansion
compression
loss
digital signals
digital
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.)
Granted
Application number
FR7726773A
Other languages
French (fr)
Other versions
FR2408945B1 (en
Inventor
Francis Kretz
Jean Louis Boudeville
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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Priority to FR7726773A priority Critical patent/FR2408945A1/en
Publication of FR2408945A1 publication Critical patent/FR2408945A1/en
Application granted granted Critical
Publication of FR2408945B1 publication Critical patent/FR2408945B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H04B14/048—Non linear compression or expansion
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

A system is used for compression and expansion or quantitising of differentially coded digital signals for a TV transmission. The method reduces the numeric loss of the signal data such that the image signal remains satisfactory. The quantisation characteristics are partially non-symmetric about zero involving the number and value of thresholds and reconstruction levels of the differences between the real values of the signal sample and its estimated value. The characteristics has less levels for its non-symmetric region for negative differences than for positive and has a slope decreasing more rapidly in the negative region than the positive.
FR7726773A 1977-08-26 1977-08-26 Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds Granted FR2408945A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7726773A FR2408945A1 (en) 1977-08-26 1977-08-26 Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7726773A FR2408945A1 (en) 1977-08-26 1977-08-26 Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds

Publications (2)

Publication Number Publication Date
FR2408945A1 true FR2408945A1 (en) 1979-06-08
FR2408945B1 FR2408945B1 (en) 1980-04-25

Family

ID=9195013

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7726773A Granted FR2408945A1 (en) 1977-08-26 1977-08-26 Compression and expansion of TV digital signals - is performed with reduced digital loss and asymmetric characteristic with several thresholds

Country Status (1)

Country Link
FR (1) FR2408945A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012632A1 (en) * 1978-12-08 1980-06-25 Etablissement Public de Diffusion dit "Télédiffusion de France" Compression and expansion (quantification) of digital differentially encoded television signals
US4661862A (en) * 1984-04-27 1987-04-28 Rca Corporation Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions
EP0288782A2 (en) * 1987-04-27 1988-11-02 Siemens Aktiengesellschaft Arrangement for the DPCM coding of television signals using fast signal processing
WO1994026068A1 (en) * 1993-04-29 1994-11-10 Alcatel N.V. Differential coding and decoding method and related circuits

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012632A1 (en) * 1978-12-08 1980-06-25 Etablissement Public de Diffusion dit "Télédiffusion de France" Compression and expansion (quantification) of digital differentially encoded television signals
US4661862A (en) * 1984-04-27 1987-04-28 Rca Corporation Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions
EP0288782A2 (en) * 1987-04-27 1988-11-02 Siemens Aktiengesellschaft Arrangement for the DPCM coding of television signals using fast signal processing
EP0288782A3 (en) * 1987-04-27 1990-06-13 Siemens Aktiengesellschaft Arrangement for the dpcm coding of television signals using fast signal processing
WO1994026068A1 (en) * 1993-04-29 1994-11-10 Alcatel N.V. Differential coding and decoding method and related circuits

Also Published As

Publication number Publication date
FR2408945B1 (en) 1980-04-25

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Legal Events

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ST Notification of lapse