JPS6130453B2 - - Google Patents

Info

Publication number
JPS6130453B2
JPS6130453B2 JP55119078A JP11907880A JPS6130453B2 JP S6130453 B2 JPS6130453 B2 JP S6130453B2 JP 55119078 A JP55119078 A JP 55119078A JP 11907880 A JP11907880 A JP 11907880A JP S6130453 B2 JPS6130453 B2 JP S6130453B2
Authority
JP
Japan
Prior art keywords
signal
level
circuit
control circuit
variable gain
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
JP55119078A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5744338A (en
Inventor
Yukinobu Ishigaki
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP55119078A priority Critical patent/JPS5744338A/ja
Priority to FR8116450A priority patent/FR2489630A1/fr
Priority to US06/297,106 priority patent/US4430754A/en
Priority to DE19813134295 priority patent/DE3134295A1/de
Priority to GB8126503A priority patent/GB2086195B/en
Publication of JPS5744338A publication Critical patent/JPS5744338A/ja
Publication of JPS6130453B2 publication Critical patent/JPS6130453B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/62—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 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • 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
    • H04B1/62—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 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
JP55119078A 1980-08-29 1980-08-29 Noise reduction device Granted JPS5744338A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP55119078A JPS5744338A (en) 1980-08-29 1980-08-29 Noise reduction device
FR8116450A FR2489630A1 (fr) 1980-08-29 1981-08-28 Reducteur de bruit d'un signal reproduit apres un certain trajet de transmission
US06/297,106 US4430754A (en) 1980-08-29 1981-08-28 Noise reducing apparatus
DE19813134295 DE3134295A1 (de) 1980-08-29 1981-08-29 Geraeuschverminderungseinrichtung
GB8126503A GB2086195B (en) 1980-08-29 1981-09-01 Noise reducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55119078A JPS5744338A (en) 1980-08-29 1980-08-29 Noise reduction device

Publications (2)

Publication Number Publication Date
JPS5744338A JPS5744338A (en) 1982-03-12
JPS6130453B2 true JPS6130453B2 (en, 2012) 1986-07-14

Family

ID=14752327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55119078A Granted JPS5744338A (en) 1980-08-29 1980-08-29 Noise reduction device

Country Status (5)

Country Link
US (1) US4430754A (en, 2012)
JP (1) JPS5744338A (en, 2012)
DE (1) DE3134295A1 (en, 2012)
FR (1) FR2489630A1 (en, 2012)
GB (1) GB2086195B (en, 2012)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449106A (en) * 1981-03-10 1984-05-15 Victor Company Of Japan, Ltd. Noise reducing apparatus
JPS58218002A (ja) * 1982-06-14 1983-12-19 Canon Inc 磁気録画再生装置
JPS5933357U (ja) * 1982-08-27 1984-03-01 パイオニア株式会社 圧縮伸長装置
US4539526A (en) * 1983-01-31 1985-09-03 Dbx, Inc. Adaptive signal weighting system
US4574390A (en) * 1983-03-26 1986-03-04 Victor Company Of Japan, Limited Noise reduction for stereophonic FM signals by high-speed sampling and linear interpolation
US4538297A (en) * 1983-08-08 1985-08-27 Waller Jr James Aurally sensitized flat frequency response noise reduction compansion system
US4704727A (en) * 1985-11-27 1987-11-03 Beard Terry D Low noise and distortion FM transmission system and method
US4718099A (en) * 1986-01-29 1988-01-05 Telex Communications, Inc. Automatic gain control for hearing aid
GB2187969A (en) * 1986-03-13 1987-09-23 Michael William Sandeen Aerodynamic toy
JPS6397021A (ja) * 1986-10-13 1988-04-27 Mitsubishi Electric Corp 圧縮装置
US4771472A (en) * 1987-04-14 1988-09-13 Hughes Aircraft Company Method and apparatus for improving voice intelligibility in high noise environments
DE3730763A1 (de) * 1987-09-12 1989-03-30 Blaupunkt Werke Gmbh Schaltung zur stoergeraeuschkompensation
US4894566A (en) * 1988-10-18 1990-01-16 Rush Michael J Noise reduction circuit
US5369711A (en) * 1990-08-31 1994-11-29 Bellsouth Corporation Automatic gain control for a headset
JP2661404B2 (ja) * 1991-05-21 1997-10-08 日本電気株式会社 携帯電話装置
DE4336609A1 (de) * 1993-10-27 1995-05-04 Klippel Wolfgang Prädikative Schutzschaltung für elektroakustische Schallsender
US5483600A (en) * 1994-02-14 1996-01-09 Aphex Systems, Ltd. Wave dependent compressor
US8085959B2 (en) * 1994-07-08 2011-12-27 Brigham Young University Hearing compensation system incorporating signal processing techniques
US6885752B1 (en) 1994-07-08 2005-04-26 Brigham Young University Hearing aid device incorporating signal processing techniques
US5701352A (en) * 1994-07-14 1997-12-23 Bellsouth Corporation Tone suppression automatic gain control for a headset
JP3618208B2 (ja) * 1997-11-12 2005-02-09 パイオニア株式会社 雑音低減装置
JP2003517761A (ja) * 1999-12-03 2003-05-27 モトローラ・インコーポレイテッド 通信システムにおける音響バックグラウンドノイズを抑制するための方法と装置
US7010491B1 (en) * 1999-12-09 2006-03-07 Roland Corporation Method and system for waveform compression and expansion with time axis
WO2008061260A2 (en) 2006-11-18 2008-05-22 Personics Holdings Inc. Method and device for personalized hearing
US8855343B2 (en) * 2007-11-27 2014-10-07 Personics Holdings, LLC. Method and device to maintain audio content level reproduction
US8582786B2 (en) * 2011-06-15 2013-11-12 Alpine Electronics, Inc. Automatic gain control of amplifier by dynamic suppressing and output control at multiple stages

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1437120A1 (de) 1963-09-17 1969-01-09 Fernseh Gmbh Verfahren und Einrichtung zur Vergroesserung des Stoerabstandes in UEbertragungssystemen fuer Farbfernsehsignale
GB1120541A (en) 1965-08-11 1968-07-17 Dolby Ray Milton Improvements in noise reduction systems
US3518566A (en) * 1968-11-21 1970-06-30 Us Navy Audio system with modified output
GB1305622A (en, 2012) 1969-07-21 1973-02-07
GB1367002A (en) 1971-04-06 1974-09-18 Victor Company Of Japan Compression and/or expansion system and circuit
GB1401336A (en) * 1971-10-05 1975-07-16 Victor Company Of Japan Expander circuit for a compression and expansion system
NO142768C (no) 1974-01-26 1980-10-08 Licentia Gmbh Kopling for automatisk dynamikk-kompresjon eller -ekspansjon
CA998617A (en) 1974-08-27 1976-10-19 Northern Electric Company A-c signal processing circuits for compandors
JPS52142409A (en) * 1976-05-21 1977-11-28 Toshiba Corp Noise reduction system
JPS5351910A (en) 1976-10-21 1978-05-11 Toshiba Corp Noise reduction system
US4101849A (en) 1976-11-08 1978-07-18 Dbx, Inc. Adaptive filter
JPS5439516A (en) * 1977-09-02 1979-03-27 Sanyo Electric Co Ltd Noise reduction unit
DE2919280A1 (de) * 1979-05-12 1980-11-20 Licentia Gmbh Schaltung zur wahlweisen automatischen dynamik-kompression oder -expansion
JPS56122243A (en) 1980-02-29 1981-09-25 Victor Co Of Japan Ltd Noise reduction system
JPS56152337A (en) 1980-04-24 1981-11-25 Victor Co Of Japan Ltd Noise reduction system

Also Published As

Publication number Publication date
FR2489630B1 (en, 2012) 1985-03-29
DE3134295A1 (de) 1982-04-22
GB2086195A (en) 1982-05-06
FR2489630A1 (fr) 1982-03-05
GB2086195B (en) 1984-12-05
JPS5744338A (en) 1982-03-12
DE3134295C2 (en, 2012) 1989-08-03
US4430754A (en) 1984-02-07

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