JPS54150015A - Squelch circuit - Google Patents

Squelch circuit

Info

Publication number
JPS54150015A
JPS54150015A JP5922478A JP5922478A JPS54150015A JP S54150015 A JPS54150015 A JP S54150015A JP 5922478 A JP5922478 A JP 5922478A JP 5922478 A JP5922478 A JP 5922478A JP S54150015 A JPS54150015 A JP S54150015A
Authority
JP
Japan
Prior art keywords
circuit
low frequency
under
output
frequency circuit
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
JP5922478A
Other languages
Japanese (ja)
Inventor
Yoshiteru Kishimoto
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 JP5922478A priority Critical patent/JPS54150015A/en
Publication of JPS54150015A publication Critical patent/JPS54150015A/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
    • H03G3/341—Muting when no signals or only weak signals are present

Landscapes

  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To eliminate the power consumption caused by the low frequency circuit or the pilot lamp by breaking at the time of non-reception state the power line of the low frequency circuit in the squelch circuit which is used to the radio receiver, the transceiver or the like. CONSTITUTION:The output higher than a fixed level is delivered from front-end 2 under the reception state, and thus transistors Tr1-3 of control circuit 6 are turned on by the negative output given from detector circuit 5 with the +B power source applied to the low frequency circuit. On the other hand, the output of front- end 2 is under a fixed level under the non-reception state, and thus the output of circuit 5 becomes zero or positive to turn off Tr1-3. Under these conditions, low frequency circuit 4, pilot lamp 7 and others become nonactive.
JP5922478A 1978-05-17 1978-05-17 Squelch circuit Pending JPS54150015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5922478A JPS54150015A (en) 1978-05-17 1978-05-17 Squelch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5922478A JPS54150015A (en) 1978-05-17 1978-05-17 Squelch circuit

Publications (1)

Publication Number Publication Date
JPS54150015A true JPS54150015A (en) 1979-11-24

Family

ID=13107183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5922478A Pending JPS54150015A (en) 1978-05-17 1978-05-17 Squelch circuit

Country Status (1)

Country Link
JP (1) JPS54150015A (en)

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