JPS56123110A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS56123110A
JPS56123110A JP2654280A JP2654280A JPS56123110A JP S56123110 A JPS56123110 A JP S56123110A JP 2654280 A JP2654280 A JP 2654280A JP 2654280 A JP2654280 A JP 2654280A JP S56123110 A JPS56123110 A JP S56123110A
Authority
JP
Japan
Prior art keywords
muting
muting circuit
circuit
type
power source
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
JP2654280A
Other languages
Japanese (ja)
Other versions
JPS648922B2 (en
Inventor
Tetsuo Sato
Yasuo Kominami
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2654280A priority Critical patent/JPS56123110A/en
Publication of JPS56123110A publication Critical patent/JPS56123110A/en
Publication of JPS648922B2 publication Critical patent/JPS648922B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To compensate muting operation when the power source is low, by cascading an attenuator type muting circuit behind a switch type muting circuit.
CONSTITUTION: When the power source is turned on and off, muting circuit 13 is operated by control circuit 2' for a certain time to eliminate a shock sound generated in the power on-off operation. Muting circuit 3 is of an attenuator type and operates at a low voltage, but its attenuation is not large. For this purpose, muting operation at stable power voltage VCC is performed by muting circuit 2. Muting circuit 2 is of a switch type and provided attenuation of 80 dB.
COPYRIGHT: (C)1981,JPO&Japio
JP2654280A 1980-03-05 1980-03-05 Muting circuit Granted JPS56123110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2654280A JPS56123110A (en) 1980-03-05 1980-03-05 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2654280A JPS56123110A (en) 1980-03-05 1980-03-05 Muting circuit

Publications (2)

Publication Number Publication Date
JPS56123110A true JPS56123110A (en) 1981-09-28
JPS648922B2 JPS648922B2 (en) 1989-02-15

Family

ID=12196379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2654280A Granted JPS56123110A (en) 1980-03-05 1980-03-05 Muting circuit

Country Status (1)

Country Link
JP (1) JPS56123110A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967702A (en) * 1982-10-12 1984-04-17 Nec Ic Microcomput Syst Ltd Muting circuit
JPH08237054A (en) * 1995-03-01 1996-09-13 Nec Corp Gain variable circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120722U (en) * 1975-03-27 1976-09-30
JPS5478452U (en) * 1977-11-14 1979-06-04
JPS54128251A (en) * 1978-03-29 1979-10-04 Hitachi Ltd Mute circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120722U (en) * 1975-03-27 1976-09-30
JPS5478452U (en) * 1977-11-14 1979-06-04
JPS54128251A (en) * 1978-03-29 1979-10-04 Hitachi Ltd Mute circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967702A (en) * 1982-10-12 1984-04-17 Nec Ic Microcomput Syst Ltd Muting circuit
JPH08237054A (en) * 1995-03-01 1996-09-13 Nec Corp Gain variable circuit

Also Published As

Publication number Publication date
JPS648922B2 (en) 1989-02-15

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