FR2312887A1 - DPCM data transmission system - has high compression rate by not coding data state which are repeated several times - Google Patents

DPCM data transmission system - has high compression rate by not coding data state which are repeated several times

Info

Publication number
FR2312887A1
FR2312887A1 FR7516404A FR7516404A FR2312887A1 FR 2312887 A1 FR2312887 A1 FR 2312887A1 FR 7516404 A FR7516404 A FR 7516404A FR 7516404 A FR7516404 A FR 7516404A FR 2312887 A1 FR2312887 A1 FR 2312887A1
Authority
FR
France
Prior art keywords
compression rate
high compression
transmission system
several times
data transmission
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
FR7516404A
Other languages
French (fr)
Other versions
FR2312887B1 (en
Inventor
Thaddeus Hawkes
Alexandre Bech
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7516404A priority Critical patent/FR2312887A1/en
Publication of FR2312887A1 publication Critical patent/FR2312887A1/en
Application granted granted Critical
Publication of FR2312887B1 publication Critical patent/FR2312887B1/fr
Granted 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
    • H04N19/93—Run-length coding
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/4025—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code constant length to or from Morse code conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission

Abstract

The differential pulse code modulation system has high compression rate allowing faster data transmission without loss of quality or higher quality for the same transmission speed. The system uses a short code for the more frequent events and a longer code for the less frequent. Coding a restricted to non-repeated data--ie to date corresponding to a state that is different from the previous state. Data states repeated two or more times are not coded.
FR7516404A 1975-05-27 1975-05-27 DPCM data transmission system - has high compression rate by not coding data state which are repeated several times Granted FR2312887A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7516404A FR2312887A1 (en) 1975-05-27 1975-05-27 DPCM data transmission system - has high compression rate by not coding data state which are repeated several times

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7516404A FR2312887A1 (en) 1975-05-27 1975-05-27 DPCM data transmission system - has high compression rate by not coding data state which are repeated several times

Publications (2)

Publication Number Publication Date
FR2312887A1 true FR2312887A1 (en) 1976-12-24
FR2312887B1 FR2312887B1 (en) 1977-12-09

Family

ID=9155697

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7516404A Granted FR2312887A1 (en) 1975-05-27 1975-05-27 DPCM data transmission system - has high compression rate by not coding data state which are repeated several times

Country Status (1)

Country Link
FR (1) FR2312887A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1547613A (en) * 1966-10-03 1968-11-29 Xerox Corp Cascading train length coding method and corresponding circuit
US3863248A (en) * 1973-01-02 1975-01-28 Univ Sherbrooke Digital compressor-expander

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1547613A (en) * 1966-10-03 1968-11-29 Xerox Corp Cascading train length coding method and corresponding circuit
US3863248A (en) * 1973-01-02 1975-01-28 Univ Sherbrooke Digital compressor-expander

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
*REVUE "INTERNATIONALE ELEKTRONISCHE RUNDSCHAU", VOLUME 27, NO. 1, JANVIER 1973, PAGES 12 A 18. ARTICLE: "EIN ADAPTIVER INTRAFRAME-CODIERER FUR FERNSEHSIGNALE", PAR WENDLAND ET MAY. *
REVUE "ABSTRACTS OF I.E.C.E. TRANSACTIONS", VOLUME 58, NO. 2, FEVRIER 1975, PAGES 3-4. ARTICLE: "A VARIABLE SAMPLING RATE CODING TECHNIQUE", PAR TAKASHI KAWADE ET AL. *

Also Published As

Publication number Publication date
FR2312887B1 (en) 1977-12-09

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Legal Events

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