JPS5752242A - Noise reducing circuit - Google Patents

Noise reducing circuit

Info

Publication number
JPS5752242A
JPS5752242A JP12770680A JP12770680A JPS5752242A JP S5752242 A JPS5752242 A JP S5752242A JP 12770680 A JP12770680 A JP 12770680A JP 12770680 A JP12770680 A JP 12770680A JP S5752242 A JPS5752242 A JP S5752242A
Authority
JP
Japan
Prior art keywords
output
gain
transmission line
input
circuit
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
JP12770680A
Other languages
Japanese (ja)
Other versions
JPS6340376B2 (en
Inventor
Kenzo Akagiri
Masayuki Katakura
Motomi Okochi
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
Priority to JP12770680A priority Critical patent/JPS5752242A/en
Publication of JPS5752242A publication Critical patent/JPS5752242A/en
Publication of JPS6340376B2 publication Critical patent/JPS6340376B2/ja
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

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To reduce a noise at the low band side, as well, by providing a series connected circuit consisting of a variable gain amplifier and an LPF inserted between input/output terminals, and a transmission line and a feedback line having no gain variation, which are connected in parallel with said circuit. CONSTITUTION:An expanding type NRD circuit 10 provided on the reproduction output side of a tape recorder is constituted of a series connected circuit consisting of a voltage control amplifier 13 inserted between an input terminal 11 and an output terminal 12, and an LPF14 having the turnover frequency in the band by a constant gain at the low band side, and a transmission line 15 and a feedback line 17 having no gain variation, which are provided in parallel with said circuit. An output from the transmission line 15 is added to an output from the LPF14 by an adder 16, and an output of the feedback line 17 is made a subtraction signal, subtracts an input signal by an adder 18, and is supplied to the VCA13. The VCA13 is controlled so that the gain decreases when an input level is small, and the gain increases when the input level is large, and the upper limit and the lower limit of the response are limited by the feedback line 17 and the transmission line 15, respectively. As the input level increases gradually, the turnover frequency is shifted to the high band side, and a noise at the low band side is reduced.
JP12770680A 1980-09-13 1980-09-13 Noise reducing circuit Granted JPS5752242A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12770680A JPS5752242A (en) 1980-09-13 1980-09-13 Noise reducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12770680A JPS5752242A (en) 1980-09-13 1980-09-13 Noise reducing circuit

Publications (2)

Publication Number Publication Date
JPS5752242A true JPS5752242A (en) 1982-03-27
JPS6340376B2 JPS6340376B2 (en) 1988-08-10

Family

ID=14966685

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12770680A Granted JPS5752242A (en) 1980-09-13 1980-09-13 Noise reducing circuit

Country Status (1)

Country Link
JP (1) JPS5752242A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130613A2 (en) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Noise reduction circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130613A2 (en) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Noise reduction circuit

Also Published As

Publication number Publication date
JPS6340376B2 (en) 1988-08-10

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