FR2474736A1 - Circuit reducteur de bruit pour un appareil d'enregistrement - Google Patents

Circuit reducteur de bruit pour un appareil d'enregistrement Download PDF

Info

Publication number
FR2474736A1
FR2474736A1 FR8101527A FR8101527A FR2474736A1 FR 2474736 A1 FR2474736 A1 FR 2474736A1 FR 8101527 A FR8101527 A FR 8101527A FR 8101527 A FR8101527 A FR 8101527A FR 2474736 A1 FR2474736 A1 FR 2474736A1
Authority
FR
France
Prior art keywords
signal
circuit
input
amplifier
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.)
Granted
Application number
FR8101527A
Other languages
English (en)
French (fr)
Other versions
FR2474736B1 (ja
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 FR2474736A1 publication Critical patent/FR2474736A1/fr
Application granted granted Critical
Publication of FR2474736B1 publication Critical patent/FR2474736B1/fr
Granted 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)
FR8101527A 1980-01-30 1981-01-27 Circuit reducteur de bruit pour un appareil d'enregistrement Granted FR2474736A1 (fr)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FR2474736A1 true FR2474736A1 (fr) 1981-07-31
FR2474736B1 FR2474736B1 (ja) 1984-11-23

Family

ID=11731797

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8101527A Granted FR2474736A1 (fr) 1980-01-30 1981-01-27 Circuit reducteur de bruit pour un appareil d'enregistrement

Country Status (11)

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

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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732371A (en) * 1971-05-10 1973-05-08 Richard S Burwen Wide dynamic range noise masking compandor
US3753159A (en) * 1970-11-03 1973-08-14 R Burwen Variable bandpass dynamic noise filter
US4145664A (en) * 1977-03-31 1979-03-20 Pioneer Electronic Corporation Audio signal compression and expansion system

Family Cites Families (8)

* 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
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
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
JPS5439516A (en) * 1977-09-02 1979-03-27 Sanyo Electric Co Ltd Noise reduction unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753159A (en) * 1970-11-03 1973-08-14 R Burwen Variable bandpass dynamic noise filter
US3732371A (en) * 1971-05-10 1973-05-08 Richard S Burwen Wide dynamic range noise masking compandor
US4145664A (en) * 1977-03-31 1979-03-20 Pioneer Electronic Corporation Audio signal compression and expansion system

Also Published As

Publication number Publication date
AU539233B2 (en) 1984-09-20
DE3103237A1 (de) 1981-12-03
NL8100412A (nl) 1981-09-01
ATA35781A (de) 1986-01-15
DE3103237C2 (de) 1993-10-14
FR2474736B1 (ja) 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 (ja) 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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Legal Events

Date Code Title Description
ST Notification of lapse