CA988432A - Compressors, expanders and noise reduction systems - Google Patents

Compressors, expanders and noise reduction systems

Info

Publication number
CA988432A
CA988432A CA169,366A CA169366A CA988432A CA 988432 A CA988432 A CA 988432A CA 169366 A CA169366 A CA 169366A CA 988432 A CA988432 A CA 988432A
Authority
CA
Canada
Prior art keywords
expanders
compressors
noise reduction
reduction systems
systems
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
CA169,366A
Other languages
English (en)
Other versions
CA169366S (en
Inventor
Ray M. Dolby
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.)
Dolby Laboratories Inc
Original Assignee
Dolby Laboratories 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 Dolby Laboratories Inc filed Critical Dolby Laboratories Inc
Application granted granted Critical
Publication of CA988432A publication Critical patent/CA988432A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/0405—Non-linear filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
CA169,366A 1972-05-02 1973-04-24 Compressors, expanders and noise reduction systems Expired CA988432A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2040672A GB1432763A (en) 1972-05-02 1972-05-02 Compressors expanders and noise reduction systems

Publications (1)

Publication Number Publication Date
CA988432A true CA988432A (en) 1976-05-04

Family

ID=10145451

Family Applications (1)

Application Number Title Priority Date Filing Date
CA169,366A Expired CA988432A (en) 1972-05-02 1973-04-24 Compressors, expanders and noise reduction systems

Country Status (11)

Country Link
US (1) US3828280A (nl)
JP (1) JPS57685B2 (nl)
AT (1) AT358099B (nl)
CA (1) CA988432A (nl)
CH (1) CH559473A5 (nl)
DE (1) DE2321686C2 (nl)
FR (1) FR2183155B1 (nl)
GB (1) GB1432763A (nl)
IT (1) IT1030662B (nl)
NL (1) NL186989C (nl)
SE (3) SE404862B (nl)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909733A (en) * 1973-05-17 1975-09-30 Dolby Laboratories Inc Dynamic range modifying circuits utilizing variable negative resistance
JPS519805A (ja) * 1974-07-15 1976-01-26 Sanyo Electric Co Zatsuonteigenkairo
US4155041A (en) 1976-05-13 1979-05-15 Burns Richard C System for reducing noise transients
JPS5918723Y2 (ja) * 1976-10-26 1984-05-30 株式会社東芝 雑音低減装置における信号レベル表示装置
US4142211A (en) * 1977-11-23 1979-02-27 Microtime, Inc. Bidimensional noise reduction system for television
FR2435156A1 (fr) * 1978-08-31 1980-03-28 Izakson Ilya Filtre adaptatif
JPS55156431A (en) * 1979-05-24 1980-12-05 Sony Corp Noise reduction system
SE422369B (sv) * 1979-08-03 1982-03-01 Arvid Lundbeck Anordning for kompensering av overforingsfunktion
JPS56106433A (en) * 1980-01-28 1981-08-24 Sony Corp Noise reducing circuit
JPS56157112A (en) * 1980-05-08 1981-12-04 Pioneer Electronic Corp Compressing and expanding circuit for signal
BE889427A (fr) * 1980-06-30 1981-10-16 Dolby Ray Milton Circuit de suppression des effets de modulation dans des compresseurs, des expanseurs et des dispositifs de reduction des bruits
DK156356C (da) * 1980-06-30 1989-12-27 Ray Milton Dolby Kredsloeb til reduktion af overbelastningseffekter i signalindspilnings-og transmissionssystemer
GB2111356B (en) * 1981-12-01 1985-03-20 Ray Milton Dolby Improvements in circuit arrangements for modifying dynamic range
CA1188384A (en) * 1981-12-29 1985-06-04 Masayuki Katakura Noise reduction circuit
JPH0320796Y2 (nl) * 1985-07-18 1991-05-07
US4737735A (en) * 1986-07-25 1988-04-12 Kampes Donald P Phantom powered amplifier
US4944024A (en) * 1989-02-02 1990-07-24 Amaf Industries, Inc. Method and apparatus for reducing noise in a linked compressor-expander telecommunications system
US5278912A (en) * 1991-06-28 1994-01-11 Resound Corporation Multiband programmable compression system
US8315398B2 (en) 2007-12-21 2012-11-20 Dts Llc System for adjusting perceived loudness of audio signals
US8538042B2 (en) 2009-08-11 2013-09-17 Dts Llc System for increasing perceived loudness of speakers
US9312829B2 (en) 2012-04-12 2016-04-12 Dts Llc System for adjusting loudness of audio signals in real time
US10983073B2 (en) 2016-07-16 2021-04-20 Rigaku Corporation Hybrid inspection system
US11990380B2 (en) * 2019-04-19 2024-05-21 Kla Corporation Methods and systems for combining x-ray metrology data sets to improve parameter estimation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193966A (en) * 1936-08-05 1940-03-19 Jones Cyril Edward Palmer Volume range controlling arrangement employing thermionic amplifiers
GB1253031A (nl) * 1968-01-10 1971-11-10
US3631365A (en) * 1968-11-01 1971-12-28 Dolby Laboratories Inc Signal compressors and expanders
BE753495A (fr) * 1969-07-21 1970-12-16 Dolby Laboratories Inc Filtres limiteurs perfectionnes pour systemes attenuateurs de bruit. (
US3729693A (en) * 1971-08-02 1973-04-24 R Dolby Compressor/expander switching methods and apparatus

Also Published As

Publication number Publication date
AT358099B (de) 1980-08-25
SE7602316L (sv) 1976-02-25
GB1432763A (en) 1976-04-22
SE404862B (sv) 1978-10-30
JPS57685B2 (nl) 1982-01-07
NL186989B (nl) 1990-11-16
IT1030662B (it) 1979-04-10
SE414102B (sv) 1980-07-07
FR2183155B1 (nl) 1977-09-02
DE2321686A1 (de) 1973-11-08
DE2321686C2 (de) 1982-12-30
NL7306131A (nl) 1973-11-06
SE409069B (sv) 1979-07-23
ATA385973A (de) 1980-01-15
CH559473A5 (nl) 1975-02-28
SE7602315L (sv) 1976-02-25
NL186989C (nl) 1991-04-16
JPS4956562A (nl) 1974-06-01
US3828280A (en) 1974-08-06
FR2183155A1 (nl) 1973-12-14

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