CA948716A - Digital attenuator - Google Patents

Digital attenuator

Info

Publication number
CA948716A
CA948716A CA145,912A CA145912A CA948716A CA 948716 A CA948716 A CA 948716A CA 145912 A CA145912 A CA 145912A CA 948716 A CA948716 A CA 948716A
Authority
CA
Canada
Prior art keywords
digital attenuator
attenuator
digital
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
CA145,912A
Other languages
English (en)
Other versions
CA145912S (en
Inventor
Hisashi Kaneko
Marvin R. Aaron
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
Application granted granted Critical
Publication of CA948716A publication Critical patent/CA948716A/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
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H04B14/048—Non linear compression or expansion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/002—Control of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/0054—Attenuators
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Complex Calculations (AREA)
  • Analogue/Digital Conversion (AREA)
CA145,912A 1971-12-22 1972-06-28 Digital attenuator Expired CA948716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21079571A 1971-12-22 1971-12-22

Publications (1)

Publication Number Publication Date
CA948716A true CA948716A (en) 1974-06-04

Family

ID=22784291

Family Applications (1)

Application Number Title Priority Date Filing Date
CA145,912A Expired CA948716A (en) 1971-12-22 1972-06-28 Digital attenuator

Country Status (10)

Country Link
US (1) US3752970A (cs)
JP (1) JPS4874162A (cs)
BE (1) BE792988A (cs)
CA (1) CA948716A (cs)
DE (1) DE2262048A1 (cs)
FR (1) FR2164820B1 (cs)
GB (1) GB1410816A (cs)
IT (1) IT976146B (cs)
NL (1) NL7217206A (cs)
SE (1) SE377395B (cs)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360943A (en) * 1972-02-24 1974-07-24 Marconi Co Ltd Digital-to-analogue converters
US4118785A (en) * 1973-10-08 1978-10-03 Nippon Telegraph And Telephone Public Corporation Method and apparatus for digital attenuation by pattern shifting
JPS5534613B2 (cs) * 1973-10-08 1980-09-08
US4181970A (en) * 1973-10-08 1980-01-01 Nippon Telegraph And Telephone Public Corporation Digital attenuator for compressed PCM signals
FR2250234B1 (cs) * 1973-10-31 1976-10-01 Alsthom Cgee
US4021652A (en) * 1975-12-11 1977-05-03 Northern Electric Company Limited Incrementally adjustable digital attenuator/amplifier
NL7800406A (nl) * 1978-01-13 1979-07-17 Philips Nv Inrichting voor het filteren van gecomprimeerde pulscode gemoduleerde signalen.
NL7801866A (nl) * 1978-02-20 1979-08-22 Philips Nv Digitale filterinrichting voor niet-uniform gekwantiseerde pcm.
US4454498A (en) * 1979-05-21 1984-06-12 Siemens Aktiengesellschaft Adjustable attenuation member for a digital telecommunications system
US4270177A (en) 1979-06-20 1981-05-26 Tokyo Shibaura Denki Kabushiki Kaisha Digital amplitude control for digital audio signal
JPH073949B2 (ja) * 1986-01-31 1995-01-18 ソニー株式会社 利得制御回路
JP2980615B2 (ja) * 1989-06-19 1999-11-22 アルプス電気株式会社 位置情報のコード符号化方法
US5237591A (en) * 1991-08-19 1993-08-17 At&T Bell Laboratories Circuit for digitally adding loss to a signal
US5495529A (en) * 1992-11-26 1996-02-27 Nec Corporation Digital sound level control apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768352A (en) * 1950-10-20 1956-10-23 Ericsson Telefon Ab L M Compressor-expander transmission system
NL280023A (cs) * 1961-06-23
US3594560A (en) * 1969-01-03 1971-07-20 Bell Telephone Labor Inc Digital expandor circuit
US3688097A (en) * 1970-05-20 1972-08-29 Bell Telephone Labor Inc Digital attenuator for non-linear pulse code modulation signals

Also Published As

Publication number Publication date
SE377395B (cs) 1975-06-30
FR2164820A1 (cs) 1973-08-03
NL7217206A (cs) 1973-06-26
JPS4874162A (cs) 1973-10-05
GB1410816A (en) 1975-10-22
BE792988A (fr) 1973-04-16
FR2164820B1 (cs) 1977-04-08
DE2262048A1 (de) 1973-07-05
US3752970A (en) 1973-08-14
IT976146B (it) 1974-08-20

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