JPS56134848A - Noise reduction circuit - Google Patents

Noise reduction circuit

Info

Publication number
JPS56134848A
JPS56134848A JP3711180A JP3711180A JPS56134848A JP S56134848 A JPS56134848 A JP S56134848A JP 3711180 A JP3711180 A JP 3711180A JP 3711180 A JP3711180 A JP 3711180A JP S56134848 A JPS56134848 A JP S56134848A
Authority
JP
Japan
Prior art keywords
terminal
control circuit
input
gain control
switched
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
JP3711180A
Other languages
Japanese (ja)
Other versions
JPS6316052B2 (en
Inventor
Kenzo Akagiri
Masayuki Katakura
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 JP3711180A priority Critical patent/JPS56134848A/en
Publication of JPS56134848A publication Critical patent/JPS56134848A/en
Publication of JPS6316052B2 publication Critical patent/JPS6316052B2/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

Abstract

PURPOSE:To enhance the reduction effect of noise modulation, by enlarging the compression ratio only for the high band of the input audio signal and by preventing needless compression and expansion from being performed for the middle band and the low band. CONSTITUTION:Gain control circuit 20 performs the decoding operation where the audio signal from input terminal 16 has the level expanded mainly. When change- over switch 13 is switched to terminal (d), amplifier 14 amplifies the input signal from input terminal 11 and sends it to input terminal 16 of gain control circuit 20, and the decoded signal is obtained through output terminal 17 from decoding output terminal 12d. When change-over switch 13 is switched to terminal (e), the encoding characteristic is obtained in gain control circuit 20.
JP3711180A 1980-03-24 1980-03-24 Noise reduction circuit Granted JPS56134848A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3711180A JPS56134848A (en) 1980-03-24 1980-03-24 Noise reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3711180A JPS56134848A (en) 1980-03-24 1980-03-24 Noise reduction circuit

Publications (2)

Publication Number Publication Date
JPS56134848A true JPS56134848A (en) 1981-10-21
JPS6316052B2 JPS6316052B2 (en) 1988-04-07

Family

ID=12488480

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3711180A Granted JPS56134848A (en) 1980-03-24 1980-03-24 Noise reduction circuit

Country Status (1)

Country Link
JP (1) JPS56134848A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951630A (en) * 1982-09-17 1984-03-26 Sony Corp Dynamic range compression circuit
EP0130613A2 (en) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Noise reduction circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951630A (en) * 1982-09-17 1984-03-26 Sony Corp Dynamic range compression circuit
JPH0522416B2 (en) * 1982-09-17 1993-03-29 Sony Corp
EP0130613A2 (en) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Noise reduction circuit

Also Published As

Publication number Publication date
JPS6316052B2 (en) 1988-04-07

Similar Documents

Publication Publication Date Title
EP0977354A4 (en) Amplifier for radio transmission
ATE69128T1 (en) RADIO RECEIVER.
DK0591441T3 (en) Improved programmable multiband compression system
ES8501934A1 (en) Analog and digital signal apparatus
MY112811A (en) Transmitting and receiving apparatus.
JPS56122243A (en) Noise reduction system
JPS5717241A (en) Dynamic emphasis circuit
JPS56134848A (en) Noise reduction circuit
JPS5752239A (en) Noise reducing circuit
JPS56124107A (en) Sound recording and reproducing switching circuit
JPS6428700A (en) Voice analyzer/synthesizer
MY123994A (en) Radio frequency modulator having isolation switches and signal path bypassing amplifier and modulator
KR19990055995A (en) Wireless Signal Transceiver
KR940020732A (en) Signal Receiving Apparatus
KR920017070A (en) High Frequency Adaptive De-emphasis and Re-emphasis in Video Signals Using Recorded Control Signals
JPS51126809A (en) A decoder circuit
JPS56107651A (en) Wide band amplifier circuit
JPS54152414A (en) Squelch system of fm mobile radio equipment
JPS5714211A (en) Dynamic range varying circuit
JPS5527716A (en) Signal transmission system for color television signal
JPS5918723Y2 (en) Signal level display device in noise reduction equipment
JPS562748A (en) Reference level varying system of compander
JPS5765914A (en) Noise reducing device
WO1995008884A3 (en) Dual output multi function interface device for audio systems
JPS5647112A (en) Am receiver