JPS5723332A - Muting device - Google Patents

Muting device

Info

Publication number
JPS5723332A
JPS5723332A JP9623880A JP9623880A JPS5723332A JP S5723332 A JPS5723332 A JP S5723332A JP 9623880 A JP9623880 A JP 9623880A JP 9623880 A JP9623880 A JP 9623880A JP S5723332 A JPS5723332 A JP S5723332A
Authority
JP
Japan
Prior art keywords
circuit
muting
output signal
noise
controlling
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
JP9623880A
Other languages
Japanese (ja)
Inventor
Kiyoshi Amasawa
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP9623880A priority Critical patent/JPS5723332A/en
Publication of JPS5723332A publication Critical patent/JPS5723332A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/344—Muting responsive to the amount of noise (noise squelch)

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To adjust a ratio of reduction of a noise which is contained in an audio signal source, by controlling a muting circuit in accordance with a variation of an output signal level from a muting controlling circuit. CONSTITUTION:A detection output signal from an audio signal source 1 is applied to a muting circuit 2 and a muting controlling circuit 3. Since a lot of noise signals are contained in the detection output signal in case of a weak electric field, a noise signal passing through a high-pass filter 4 of the circuit 3 is also increased. Accordingly, since there are a lot of DC signals from a rectifying circuit 6, operation of the circuit 2 is controlled, and the detection output signal is not outputted to an output terminal.
JP9623880A 1980-07-16 1980-07-16 Muting device Pending JPS5723332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9623880A JPS5723332A (en) 1980-07-16 1980-07-16 Muting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9623880A JPS5723332A (en) 1980-07-16 1980-07-16 Muting device

Publications (1)

Publication Number Publication Date
JPS5723332A true JPS5723332A (en) 1982-02-06

Family

ID=14159646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9623880A Pending JPS5723332A (en) 1980-07-16 1980-07-16 Muting device

Country Status (1)

Country Link
JP (1) JPS5723332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914715A (en) * 1987-12-18 1990-04-03 Nec Corporation FM receiving circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914715A (en) * 1987-12-18 1990-04-03 Nec Corporation FM receiving circuit

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