CA969279A - Digital conversion from one pcm format to another - Google Patents

Digital conversion from one pcm format to another

Info

Publication number
CA969279A
CA969279A CA155,151A CA155151A CA969279A CA 969279 A CA969279 A CA 969279A CA 155151 A CA155151 A CA 155151A CA 969279 A CA969279 A CA 969279A
Authority
CA
Canada
Prior art keywords
another
digital conversion
pcm format
pcm
format
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.)
Expired
Application number
CA155,151A
Other languages
English (en)
Other versions
CA155151S (en
Inventor
James L. Flanagan
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to CA205,653A priority Critical patent/CA978650A/en
Application granted granted Critical
Publication of CA969279A publication Critical patent/CA969279A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3044—Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM]
    • H03M7/3046—Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM] adaptive, e.g. adaptive differential pulse code modulation [ADPCM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
CA155,151A 1972-04-19 1972-10-30 Digital conversion from one pcm format to another Expired CA969279A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA205,653A CA978650A (en) 1972-04-19 1974-07-25 Digital conversion from one pcm format to another

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24555972A 1972-04-19 1972-04-19

Publications (1)

Publication Number Publication Date
CA969279A true CA969279A (en) 1975-06-10

Family

ID=22927152

Family Applications (1)

Application Number Title Priority Date Filing Date
CA155,151A Expired CA969279A (en) 1972-04-19 1972-10-30 Digital conversion from one pcm format to another

Country Status (10)

Country Link
US (1) US3772682A (de)
JP (1) JPS5639578B2 (de)
BE (1) BE798328A (de)
CA (1) CA969279A (de)
DE (1) DE2319650C3 (de)
FR (1) FR2180964B1 (de)
GB (1) GB1388232A (de)
IT (1) IT991561B (de)
NL (1) NL183115C (de)
SE (2) SE451522B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7400764A (nl) * 1974-01-21 1975-07-23 Philips Nv Digitale inrichting voor het omzetten van ge- comprimeerde delta gemoduleerde signalen in pcm-signalen.
US4206447A (en) * 1979-04-09 1980-06-03 Bell Telephone Laboratories, Incorporated Adaptive quantizer apparatus for differential coding of nonuniform digital signals
JPS56146313A (en) * 1980-04-15 1981-11-13 Victor Co Of Japan Ltd Compressing and expanding system of digital modulated wave
US4524447A (en) * 1983-05-25 1985-06-18 Rca Corporation Digital signal processing apparatus having digital dither
EP0402058B1 (de) * 1989-06-07 1996-03-27 Canon Kabushiki Kaisha Kodefehler korrigierende Vorhersage-Decodiervorrichtung
JP2754741B2 (ja) * 1989-06-09 1998-05-20 キヤノン株式会社 符号化装置
EP0508597B1 (de) * 1991-03-08 1997-11-12 Nec Corporation ADPCM-Kodeumsetzer, in welchem für die Kodeumsetzung verschiedene Bitzahlen verwendet werden
ATE442705T1 (de) 1999-07-19 2009-09-15 Texas Instruments Inc Differenzielle monadische kodierung für digitales audiosignal
US7453889B2 (en) * 2005-02-02 2008-11-18 Texas Instruments Incorporated Interoperability of ADPCM encoded voice communications

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339142A (en) * 1963-07-01 1967-08-29 Martin Marietta Corp Adaptive pulse transmission system with modified delta modulation and redundant pulse elimination
FR1489885A (fr) * 1966-06-17 1967-07-28 Alcatel Sa Procédé de réduction de la bande passante dans un système de transmission par modulation en delta
US3500441A (en) * 1967-10-12 1970-03-10 Bell Telephone Labor Inc Delta modulation with discrete companding
US3526855A (en) * 1968-03-18 1970-09-01 Bell Telephone Labor Inc Pulse code modulation and differential pulse code modulation encoders
US3594560A (en) * 1969-01-03 1971-07-20 Bell Telephone Labor Inc Digital expandor circuit
US3707712A (en) * 1970-06-10 1972-12-26 Univ Sherbrooke Converter from delta modulation to pulse code modulation

Also Published As

Publication number Publication date
FR2180964A1 (de) 1973-11-30
FR2180964B1 (de) 1976-05-07
SE451522B (sv) 1987-10-12
DE2319650B2 (de) 1980-09-18
JPS4921056A (de) 1974-02-25
JPS5639578B2 (de) 1981-09-14
GB1388232A (en) 1975-03-26
DE2319650A1 (de) 1973-10-25
DE2319650C3 (de) 1981-07-09
NL183115C (nl) 1988-07-18
IT991561B (it) 1975-08-30
BE798328A (fr) 1973-08-16
AU5450573A (en) 1974-10-17
SE409633B (sv) 1979-08-27
US3772682A (en) 1973-11-13
NL183115B (nl) 1988-02-16
NL7305371A (de) 1973-10-23
SE7512465L (sv) 1975-11-06

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