SE428165B - Teckenkompression och expansion i pcm-system - Google Patents

Teckenkompression och expansion i pcm-system

Info

Publication number
SE428165B
SE428165B SE7610782A SE7610782A SE428165B SE 428165 B SE428165 B SE 428165B SE 7610782 A SE7610782 A SE 7610782A SE 7610782 A SE7610782 A SE 7610782A SE 428165 B SE428165 B SE 428165B
Authority
SE
Sweden
Prior art keywords
expansion
pcm system
sign compression
sign
compression
Prior art date
Application number
SE7610782A
Other languages
English (en)
Other versions
SE7610782L (sv
Inventor
D G Messerschmitt
Original Assignee
Western Electric Co
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 filed Critical Western Electric Co
Publication of SE7610782L publication Critical patent/SE7610782L/sv
Publication of SE428165B publication Critical patent/SE428165B/sv

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
    • H03M7/50—Conversion to or from non-linear codes, e.g. companding
    • 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
    • H03M7/3053—Block-companding PCM systems
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
SE7610782A 1975-10-09 1976-09-29 Teckenkompression och expansion i pcm-system SE428165B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/621,130 US4040049A (en) 1975-10-09 1975-10-09 Tandem block digital processor for use with nonuniformly encoded digital data

Publications (2)

Publication Number Publication Date
SE7610782L SE7610782L (sv) 1977-04-10
SE428165B true SE428165B (sv) 1983-06-06

Family

ID=24488855

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7610782A SE428165B (sv) 1975-10-09 1976-09-29 Teckenkompression och expansion i pcm-system

Country Status (8)

Country Link
US (1) US4040049A (sv)
JP (1) JPS5247671A (sv)
CA (1) CA1093211A (sv)
DE (1) DE2645621C2 (sv)
FR (1) FR2327678A1 (sv)
GB (1) GB1555027A (sv)
NL (1) NL7611100A (sv)
SE (1) SE428165B (sv)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS542050A (en) * 1977-06-07 1979-01-09 Nec Corp Block coding and decoding system
US4311988A (en) * 1979-04-05 1982-01-19 Motorola Inc. Programmable A-law and μ-law DAC
JPS5939134A (ja) * 1982-08-30 1984-03-03 Hitachi Ltd 折線伸張回路
US4544916A (en) * 1982-08-31 1985-10-01 At&T Bell Laboratories Digital code translator
DE3313119A1 (de) * 1983-04-12 1984-10-18 Siemens AG, 1000 Berlin und 8000 München Verfahren zur digitalen tonuebertragung
US4472747A (en) * 1983-04-19 1984-09-18 Compusound, Inc. Audio digital recording and playback system
US5138641A (en) * 1989-04-27 1992-08-11 Advanced Micro Devices, Inc. Bit residue correction in a dlc receiver
US5968149A (en) * 1998-01-07 1999-10-19 International Business Machines Corporation Tandem operation of input/output data compression modules
US11643708B2 (en) * 2019-05-23 2023-05-09 Toyo Seikan Group Holdings, Ltd. Nickel-based self-fluxing alloy, glass manufacturing member using the nickel-based self-fluxing alloy, as well as mold and glass gob transporting member each using the glass manufacturing member

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131635A1 (de) * 1970-09-15 1972-03-16 It Telecommunicazioni Siemens Digitale Komprimierschaltung
DE2131634A1 (de) * 1970-09-24 1972-03-30 It Telecommunicazioni Siemens Digitale Expandierschaltung
US3778605A (en) * 1971-04-16 1973-12-11 Bell Telephone Labor Inc Digital expandor for pcm code words
CH545560A (sv) * 1971-05-06 1974-01-31
US3766546A (en) * 1972-04-21 1973-10-16 Bell Telephone Labor Inc Converter for segment companded pcm codes
US3825924A (en) * 1972-06-27 1974-07-23 Bell Telephone Labor Inc Pulse code modulation code conversion
US3821711A (en) * 1972-12-26 1974-06-28 Ibm Self adaptive compression and expansion apparatus for changing the length of digital information
US3945002A (en) * 1974-10-25 1976-03-16 Bell Telephone Laboratories, Incorporated Block digital processor for use with nonuniformly encoded digital words

Also Published As

Publication number Publication date
SE7610782L (sv) 1977-04-10
US4040049A (en) 1977-08-02
DE2645621A1 (de) 1977-04-21
GB1555027A (en) 1979-11-07
NL7611100A (nl) 1977-04-13
JPS5247671A (en) 1977-04-15
FR2327678A1 (fr) 1977-05-06
CA1093211A (en) 1981-01-06
FR2327678B1 (sv) 1981-10-16
DE2645621C2 (de) 1982-05-19

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