JPS5773509A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5773509A
JPS5773509A JP55148314A JP14831480A JPS5773509A JP S5773509 A JPS5773509 A JP S5773509A JP 55148314 A JP55148314 A JP 55148314A JP 14831480 A JP14831480 A JP 14831480A JP S5773509 A JPS5773509 A JP S5773509A
Authority
JP
Japan
Prior art keywords
circuit
state
amplifying
muting
amplify
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
JP55148314A
Other languages
Japanese (ja)
Inventor
Masanori Ienaka
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 JP55148314A priority Critical patent/JPS5773509A/en
Publication of JPS5773509A publication Critical patent/JPS5773509A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To reduce the pop noise at on/off of muting operation and to simplify the circuit constitution, by providing two amplifying circuits of common output and a control circuit which makes one to nonoperating and another to operating state.
CONSTITUTION: The 1st amplifying circuit 4A to amplify either one of AM, FM wave detection output signals and the 2nd amplifying circuit 4C to which the reference voltage is inputted, are provided, and the outputs are commonly connected. When a control signal from a muting deciding circuit 3 is at off-state, the amplifying circuit 4A is made to operating-state and the amplifying circuit 4C is to nonperating- state via a control circuit 4D to amplify the output signal of the wave detection circuit 1 or 2 and to transmit it to a decoder 5. When a control signal is at on- state, the circuit 4A is made to nonoperating state and the circuit 4C is to operating state, allowing to avoid the transmission of wave-detected output signals. Thus, the popnoise at on/off of muting operation can be reduced. Further, a simple circuit which can be used commonly for the reception systems of AM and FM is obtained.
COPYRIGHT: (C)1982,JPO&Japio
JP55148314A 1980-10-24 1980-10-24 Muting circuit Pending JPS5773509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55148314A JPS5773509A (en) 1980-10-24 1980-10-24 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55148314A JPS5773509A (en) 1980-10-24 1980-10-24 Muting circuit

Publications (1)

Publication Number Publication Date
JPS5773509A true JPS5773509A (en) 1982-05-08

Family

ID=15450012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55148314A Pending JPS5773509A (en) 1980-10-24 1980-10-24 Muting circuit

Country Status (1)

Country Link
JP (1) JPS5773509A (en)

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