JPS566543A - Silencing circuit - Google Patents

Silencing circuit

Info

Publication number
JPS566543A
JPS566543A JP8230279A JP8230279A JPS566543A JP S566543 A JPS566543 A JP S566543A JP 8230279 A JP8230279 A JP 8230279A JP 8230279 A JP8230279 A JP 8230279A JP S566543 A JPS566543 A JP S566543A
Authority
JP
Japan
Prior art keywords
muting
transistors
terminal
case
demodulation signal
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
JP8230279A
Other languages
Japanese (ja)
Inventor
Hiromitsu Yamashita
Kenji Kojima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8230279A priority Critical patent/JPS566543A/en
Publication of JPS566543A publication Critical patent/JPS566543A/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

Landscapes

  • Television Receiver Circuits (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate the noise occurring at the switching time of the TV picture receiver or at the channel switching time, by installing the switch between the collector and the emitter of a pair of transistors each which form a differential amplifier. CONSTITUTION:In case the voltage applied to muting signal input terminal 58 to which the muting signal is applied is high enough to give conduction to transistors 7 and 8 as well as to give no conduction to transistors 5 and 6 each, the AM demodulation signal does not flow at all to load resistance 15. And only the DC current flows to resistance 15, and the current value becomes to L0/2. This means the state under which the muting is applied, and no demodulation signal emerges at demodulation signal output terminal 54. In addition, the DC voltage of terminal 54 becomes exactly equal to the case in which no muting is applied, i.e., in case terminal 58 is in a low level. Accordingly, the noise caused by the break of the muting can be eliminated.
JP8230279A 1979-06-27 1979-06-27 Silencing circuit Pending JPS566543A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8230279A JPS566543A (en) 1979-06-27 1979-06-27 Silencing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8230279A JPS566543A (en) 1979-06-27 1979-06-27 Silencing circuit

Publications (1)

Publication Number Publication Date
JPS566543A true JPS566543A (en) 1981-01-23

Family

ID=13770748

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8230279A Pending JPS566543A (en) 1979-06-27 1979-06-27 Silencing circuit

Country Status (1)

Country Link
JP (1) JPS566543A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131276A (en) * 1983-01-17 1984-07-28 Sony Corp Television sound receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131276A (en) * 1983-01-17 1984-07-28 Sony Corp Television sound receiver
JPH053194B2 (en) * 1983-01-17 1993-01-14 Sony Corp

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