JPS57155843A - Noise reduction circuit - Google Patents

Noise reduction circuit

Info

Publication number
JPS57155843A
JPS57155843A JP4203381A JP4203381A JPS57155843A JP S57155843 A JPS57155843 A JP S57155843A JP 4203381 A JP4203381 A JP 4203381A JP 4203381 A JP4203381 A JP 4203381A JP S57155843 A JPS57155843 A JP S57155843A
Authority
JP
Japan
Prior art keywords
signal
output signal
circuit
output
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.)
Pending
Application number
JP4203381A
Other languages
Japanese (ja)
Inventor
Tomoyuki Kawabata
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP4203381A priority Critical patent/JPS57155843A/en
Publication of JPS57155843A publication Critical patent/JPS57155843A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Networks Using Active Elements (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To enable a remarkable noise reduction, by performing a signal level adjustment accompanied with addition and subtraction at an input side and an output side of a signal processing circuit. CONSTITUTION:An input signal Vi and an output signal of a voltage control type variable gain amplifier 12 inputting the input signal Vi are applied to an adder 10, an output signal Va is applied to a signal processing circuit 16, and the gain of a voltage control type variable gain ampifier 18 with a control signal in response to the input signal Vi from a control signal generating circuit 14 is controlled. An output signal Vb from the signal processing circuit 16 and a signal -Vc inverting the phase of an output signal Vc of the amplifier 18 having the gain of =1 to which the output signal Vb is inputted, are added to an adder 26 to obtain an output signal Vo. In this case, based on an output signal Vs from a nonsignal detection circuit 22 and an output signal from the circuit 14, an output signal of the circuit 14 is taken as a control signal VG as it is with a control signal generating circuit 20 when Vs=0, and when Vs=1, the gain of the amplifier 18 is taken as the unity by the control signal VG.
JP4203381A 1981-03-23 1981-03-23 Noise reduction circuit Pending JPS57155843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4203381A JPS57155843A (en) 1981-03-23 1981-03-23 Noise reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4203381A JPS57155843A (en) 1981-03-23 1981-03-23 Noise reduction circuit

Publications (1)

Publication Number Publication Date
JPS57155843A true JPS57155843A (en) 1982-09-27

Family

ID=12624845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4203381A Pending JPS57155843A (en) 1981-03-23 1981-03-23 Noise reduction circuit

Country Status (1)

Country Link
JP (1) JPS57155843A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174496A (en) * 1987-01-14 1988-07-18 Mitsubishi Electric Corp Delaying device
JPH073627U (en) * 1992-07-07 1995-01-20 幸雄 中濱 Electric lift for medical beds

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174496A (en) * 1987-01-14 1988-07-18 Mitsubishi Electric Corp Delaying device
JPH073627U (en) * 1992-07-07 1995-01-20 幸雄 中濱 Electric lift for medical beds

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