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ES473132A1 - PCM codec using common d/a converter for encoding and decoding - Google Patents

PCM codec using common d/a converter for encoding and decoding

Info

Publication number
ES473132A1
ES473132A1 ES473132A ES473132A ES473132A1 ES 473132 A1 ES473132 A1 ES 473132A1 ES 473132 A ES473132 A ES 473132A ES 473132 A ES473132 A ES 473132A ES 473132 A1 ES473132 A1 ES 473132A1
Authority
ES
Spain
Prior art keywords
pcm
encoding
decoding
decoded
level
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
ES473132A
Other languages
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana 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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES473132A1 publication Critical patent/ES473132A1/en
Expired 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
    • H04B14/042—Special circuits, e.g. comparators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A coder/decoder in a PCM communications system, employs a common digital-to-analog converter. In a basic sampling interval the incoming PCM signal is decoded at a decision level on one side of the desired reconstruction level then modified and again decoded at a different decision level on the other side of the desired level. The average of the two decoded signals then lies on the desired level giving a decoding characteristic having decision levels between those of the encoding characteristics. As used in a conventional PCM system, the two PCM samples differ by only one least significant bit. In a preferred embodiment, separate storage registers R1 R2 are used for encoding and decoding, plus a selector 262 for switching between the two registers during the decoding intervals. Thus, encoding may be effected during a substantial portion of the basic sampling cycle, being interrupted only to generate decoded samples. The invention is applicable to PCM systems generally, including compressed pulse code modulation systems.
ES473132A 1977-09-06 1978-09-06 PCM codec using common d/a converter for encoding and decoding Expired ES473132A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83077977A 1977-09-06 1977-09-06

Publications (1)

Publication Number Publication Date
ES473132A1 true ES473132A1 (en) 1979-10-16

Family

ID=25257676

Family Applications (1)

Application Number Title Priority Date Filing Date
ES473132A Expired ES473132A1 (en) 1977-09-06 1978-09-06 PCM codec using common d/a converter for encoding and decoding

Country Status (5)

Country Link
JP (1) JPS6017256B2 (en)
BR (1) BR7805867A (en)
CA (1) CA1132711A (en)
ES (1) ES473132A1 (en)
GB (1) GB2004149B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392123A (en) * 1980-06-02 1983-07-05 The Dindima Group Pty. Ltd. Signal-to-noise improving system
US4535474A (en) * 1983-08-15 1985-08-13 Signal Research Laboratory Audio ambience simulator

Also Published As

Publication number Publication date
JPS5496312A (en) 1979-07-30
GB2004149B (en) 1982-02-03
BR7805867A (en) 1979-05-02
GB2004149A (en) 1979-03-21
JPS6017256B2 (en) 1985-05-01
CA1132711A (en) 1982-09-28

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