AU539233B2 - Noise reduction - Google Patents

Noise reduction

Info

Publication number
AU539233B2
AU539233B2 AU66358/81A AU6635881A AU539233B2 AU 539233 B2 AU539233 B2 AU 539233B2 AU 66358/81 A AU66358/81 A AU 66358/81A AU 6635881 A AU6635881 A AU 6635881A AU 539233 B2 AU539233 B2 AU 539233B2
Authority
AU
Australia
Prior art keywords
noise reduction
noise
reduction
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.)
Ceased
Application number
AU66358/81A
Other languages
English (en)
Other versions
AU6635881A (en
Inventor
Kenzo Akagiri
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of AU6635881A publication Critical patent/AU6635881A/en
Application granted granted Critical
Publication of AU539233B2 publication Critical patent/AU539233B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Noise Elimination (AREA)
AU66358/81A 1980-01-30 1981-01-20 Noise reduction Ceased AU539233B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP985780 1980-01-30
JP985780A JPS56107648A (en) 1980-01-30 1980-01-30 Noise reduction circuit

Publications (2)

Publication Number Publication Date
AU6635881A AU6635881A (en) 1981-08-06
AU539233B2 true AU539233B2 (en) 1984-09-20

Family

ID=11731797

Family Applications (1)

Application Number Title Priority Date Filing Date
AU66358/81A Ceased AU539233B2 (en) 1980-01-30 1981-01-20 Noise reduction

Country Status (11)

Country Link
JP (1) JPS56107648A (de)
AT (1) AT381194B (de)
AU (1) AU539233B2 (de)
BE (1) BE887278A (de)
CA (1) CA1158172A (de)
CH (1) CH657485A5 (de)
DE (1) DE3103237C2 (de)
FR (1) FR2474736A1 (de)
GB (1) GB2068197B (de)
IT (1) IT1135216B (de)
NL (1) NL8100412A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490691A (en) * 1980-06-30 1984-12-25 Dolby Ray Milton Compressor-expander circuits and, circuit arrangements for modifying dynamic range, for suppressing mid-frequency modulation effects and for reducing media overload
JPH0775103B2 (ja) * 1987-05-13 1995-08-09 三菱電機株式会社 ノイズリダクシヨン回路
US5424881A (en) 1993-02-01 1995-06-13 Cirrus Logic, Inc. Synchronous read channel

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846719A (en) * 1973-09-13 1974-11-05 Dolby Laboratories Inc Noise reduction systems
US3678416A (en) * 1971-07-26 1972-07-18 Richard S Burwen Dynamic noise filter having means for varying cutoff point
US3789143A (en) * 1971-03-29 1974-01-29 D Blackmer Compander with control signal logarithmically related to the instantaneous rms value of the input signal
FI57502C (fi) * 1971-04-06 1980-08-11 Victor Company Of Japan Kompressions- och expansionssystem
US3732371A (en) * 1971-05-10 1973-05-08 Richard S Burwen Wide dynamic range noise masking compandor
GB1438711A (en) * 1973-01-23 1976-06-09 Dolby Laboratories Inc Calibration oscillators for noise reduction systems
GB1473833A (en) * 1973-05-17 1977-05-18 Dolby Laboratories Inc Circuit for the dynamic range of a signal
US3902131A (en) * 1974-09-06 1975-08-26 Quadracast Systems Tandem audio dynamic range expander
JPS52142409A (en) * 1976-05-21 1977-11-28 Toshiba Corp Noise reduction system
JPS53121506A (en) * 1977-03-31 1978-10-24 Pioneer Electronic Corp Signal compressing and expanding device
JPS5439516A (en) * 1977-09-02 1979-03-27 Sanyo Electric Co Ltd Noise reduction unit

Also Published As

Publication number Publication date
DE3103237A1 (de) 1981-12-03
NL8100412A (nl) 1981-09-01
ATA35781A (de) 1986-01-15
FR2474736A1 (fr) 1981-07-31
DE3103237C2 (de) 1993-10-14
FR2474736B1 (de) 1984-11-23
AT381194B (de) 1986-09-10
CA1158172A (en) 1983-12-06
AU6635881A (en) 1981-08-06
GB2068197A (en) 1981-08-05
BE887278A (fr) 1981-05-14
CH657485A5 (de) 1986-08-29
JPS6232850B2 (de) 1987-07-17
IT8119388A0 (it) 1981-01-28
GB2068197B (en) 1984-08-08
IT1135216B (it) 1986-08-20
JPS56107648A (en) 1981-08-26

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