JPS5579512A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5579512A
JPS5579512A JP15393278A JP15393278A JPS5579512A JP S5579512 A JPS5579512 A JP S5579512A JP 15393278 A JP15393278 A JP 15393278A JP 15393278 A JP15393278 A JP 15393278A JP S5579512 A JPS5579512 A JP S5579512A
Authority
JP
Japan
Prior art keywords
muting
ground point
collector
emitter
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.)
Granted
Application number
JP15393278A
Other languages
Japanese (ja)
Other versions
JPH0249061B2 (en
Inventor
Onori Murakami
Kazuyuki Yamaguchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15393278A priority Critical patent/JPS5579512A/en
Publication of JPS5579512A publication Critical patent/JPS5579512A/en
Publication of JPH0249061B2 publication Critical patent/JPH0249061B2/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

Landscapes

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

Abstract

PURPOSE:To reduce distortion of an output signal by connecting the emitter of a muting transistor Tr, connected between the output terminal of a signal output circuit and the ground point, to the output terminal and its collector to the ground point. CONSTITUTION:Between output terminal 7 of signal amplifying Tr1 and ground point E, muting Tr4 is provided and its emitter is connected to terminal 7 while its collector is also connected to ground point E. Since when the connection of the circuit like this is IC-implemented, no parasitic diode resides at the emitter of Tr4, no signal clipping is done, causing no distortion. When the emitter area of Tr4 is made to approximate to its collector area as much as possible in case of the IC- implementation of this muting circuit, the current amplification factor can greatly be improved even at a collector-grounded point and potentials at terminal 7 and ground point approximate nearly to an equal value, so that a shock tone based upon a difference in potential between muting operation and non-muting operation can be suppressed.
JP15393278A 1978-12-12 1978-12-12 Muting circuit Granted JPS5579512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15393278A JPS5579512A (en) 1978-12-12 1978-12-12 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15393278A JPS5579512A (en) 1978-12-12 1978-12-12 Muting circuit

Publications (2)

Publication Number Publication Date
JPS5579512A true JPS5579512A (en) 1980-06-16
JPH0249061B2 JPH0249061B2 (en) 1990-10-29

Family

ID=15573224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15393278A Granted JPS5579512A (en) 1978-12-12 1978-12-12 Muting circuit

Country Status (1)

Country Link
JP (1) JPS5579512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56123111A (en) * 1980-03-05 1981-09-28 Hitachi Ltd Muting circuit
JPS5850505U (en) * 1981-09-29 1983-04-05 日本ビクター株式会社 Muting drive circuit
JPS58204611A (en) * 1982-05-24 1983-11-29 Mitsubishi Electric Corp Amplifier circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56123111A (en) * 1980-03-05 1981-09-28 Hitachi Ltd Muting circuit
JPS5850505U (en) * 1981-09-29 1983-04-05 日本ビクター株式会社 Muting drive circuit
JPS58204611A (en) * 1982-05-24 1983-11-29 Mitsubishi Electric Corp Amplifier circuit

Also Published As

Publication number Publication date
JPH0249061B2 (en) 1990-10-29

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