JPS57210705A - Muting circuit for variable impedance circuit - Google Patents

Muting circuit for variable impedance circuit

Info

Publication number
JPS57210705A
JPS57210705A JP9469381A JP9469381A JPS57210705A JP S57210705 A JPS57210705 A JP S57210705A JP 9469381 A JP9469381 A JP 9469381A JP 9469381 A JP9469381 A JP 9469381A JP S57210705 A JPS57210705 A JP S57210705A
Authority
JP
Japan
Prior art keywords
circuit
gate
hold
variable resistor
muting
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
JP9469381A
Other languages
Japanese (ja)
Other versions
JPH0231524B2 (en
Inventor
Akio Kaneko
Hitoshi Kajiwara
Yukihiko Haikawa
Kazuya Nishimukai
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.)
ARUPAIN KK
Alpine Electronics Inc
Original Assignee
ARUPAIN KK
Alpine Electronics Inc
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 ARUPAIN KK, Alpine Electronics Inc filed Critical ARUPAIN KK
Priority to JP9469381A priority Critical patent/JPS57210705A/en
Publication of JPS57210705A publication Critical patent/JPS57210705A/en
Publication of JPH0231524B2 publication Critical patent/JPH0231524B2/ja
Granted 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
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To avoid the production of an abnormal sound when a gate is switched, by providing a muting circuit for a plurality of applications of a variable resistor using a hold-through gate. CONSTITUTION:When a switch S4 turns on and a switch S5 turns off, a hold- through gate 7 is in a through-state and a flip-flop 6 waites for input. A variable resistor 1 is operated as a sound volume adjuster. A state just before the operation of the switches S4 and S5 is given from a hold-through gate 7' to a tone controlling circuit. If a variable resistor 1 is set to a value greater than a reference value of a comparator 4, the flip-flop 6 is at low level and an attenuator 10 is controlled to be muted. As a result, a large sound when the switches S4 and S5 are operated can be prevented.
JP9469381A 1981-06-19 1981-06-19 Muting circuit for variable impedance circuit Granted JPS57210705A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9469381A JPS57210705A (en) 1981-06-19 1981-06-19 Muting circuit for variable impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9469381A JPS57210705A (en) 1981-06-19 1981-06-19 Muting circuit for variable impedance circuit

Publications (2)

Publication Number Publication Date
JPS57210705A true JPS57210705A (en) 1982-12-24
JPH0231524B2 JPH0231524B2 (en) 1990-07-13

Family

ID=14117261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9469381A Granted JPS57210705A (en) 1981-06-19 1981-06-19 Muting circuit for variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS57210705A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54150922A (en) * 1978-05-19 1979-11-27 Matsushita Electric Ind Co Ltd Control unit
JPS5633814U (en) * 1979-08-23 1981-04-02

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5528262A (en) * 1978-08-18 1980-02-28 Omron Tateisi Electronics Co Timer clutch mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54150922A (en) * 1978-05-19 1979-11-27 Matsushita Electric Ind Co Ltd Control unit
JPS5633814U (en) * 1979-08-23 1981-04-02

Also Published As

Publication number Publication date
JPH0231524B2 (en) 1990-07-13

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