FR2314618A1 - Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations - Google Patents

Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations

Info

Publication number
FR2314618A1
FR2314618A1 FR7518544A FR7518544A FR2314618A1 FR 2314618 A1 FR2314618 A1 FR 2314618A1 FR 7518544 A FR7518544 A FR 7518544A FR 7518544 A FR7518544 A FR 7518544A FR 2314618 A1 FR2314618 A1 FR 2314618A1
Authority
FR
France
Prior art keywords
differential pulse
amplitude variations
data transmission
variable
digital 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.)
Granted
Application number
FR7518544A
Other languages
French (fr)
Other versions
FR2314618B1 (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 FR7518544A priority Critical patent/FR2314618A1/en
Publication of FR2314618A1 publication Critical patent/FR2314618A1/en
Application granted granted Critical
Publication of FR2314618B1 publication Critical patent/FR2314618B1/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
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/04—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM]
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

The data transmission system uses differential pulse code modulation with variable intervals, the digital data relating to the amplitude variations between successive samples of the analogue signal to be transmitted being transcoded according to a variable length code. The transcoding is reserved for the data corresponding to a non-redundant state, the data corresponding to a redundant state only being taken into account if that state is repeated more than twice successively. Each transcoded data comprises a first part relating to the amplitude variation information and a second part relating to the time interval information, using a variable length code for time intervals up to a given value and fixed length code for time intervals above this value.
FR7518544A 1975-06-13 1975-06-13 Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations Granted FR2314618A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7518544A FR2314618A1 (en) 1975-06-13 1975-06-13 Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7518544A FR2314618A1 (en) 1975-06-13 1975-06-13 Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations

Publications (2)

Publication Number Publication Date
FR2314618A1 true FR2314618A1 (en) 1977-01-07
FR2314618B1 FR2314618B1 (en) 1979-05-18

Family

ID=9156488

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7518544A Granted FR2314618A1 (en) 1975-06-13 1975-06-13 Data transmission using differential pulse code modulation - has variable code length for digital data relating to amplitude variations

Country Status (1)

Country Link
FR (1) FR2314618A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027233A1 (en) * 1979-10-12 1981-04-22 POLYGRAM GmbH Coding method for analog signals
FR2554995A1 (en) * 1983-11-15 1985-05-17 Thomson Cgr METHOD FOR COMPRESSING A SUCCESSION OF DIGITAL INFORMATION AND DEVICE USING THE SAME

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027233A1 (en) * 1979-10-12 1981-04-22 POLYGRAM GmbH Coding method for analog signals
FR2554995A1 (en) * 1983-11-15 1985-05-17 Thomson Cgr METHOD FOR COMPRESSING A SUCCESSION OF DIGITAL INFORMATION AND DEVICE USING THE SAME
EP0142439A2 (en) * 1983-11-15 1985-05-22 Thomson-Cgr Method of compressing a train of digital information, and apparatus therefor
EP0142439A3 (en) * 1983-11-15 1985-06-19 Thomson-Cgr Method of compressing a train of digital information, and apparatus therefor
US4646148A (en) * 1983-11-15 1987-02-24 Thomson-Cgr Process of compressing a succession of digital data and device for carrying out the same

Also Published As

Publication number Publication date
FR2314618B1 (en) 1979-05-18

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Legal Events

Date Code Title Description
ST Notification of lapse