JPS54150908A - Squelch circuit - Google Patents

Squelch circuit

Info

Publication number
JPS54150908A
JPS54150908A JP5954178A JP5954178A JPS54150908A JP S54150908 A JPS54150908 A JP S54150908A JP 5954178 A JP5954178 A JP 5954178A JP 5954178 A JP5954178 A JP 5954178A JP S54150908 A JPS54150908 A JP S54150908A
Authority
JP
Japan
Prior art keywords
voltage
switch
noise
comparator
receiver
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
JP5954178A
Other languages
Japanese (ja)
Inventor
Hisashi Sawada
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 JP5954178A priority Critical patent/JPS54150908A/en
Publication of JPS54150908A publication Critical patent/JPS54150908A/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
    • H03G3/344—Muting responsive to the amount of noise (noise squelch)

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To secure always the minimum S/N by comparing the signal voltage with the noise voltage through the voltage comparator and then turning on and off the switch of the receiver output according to the comparison result. CONSTITUTION:Receiver output Vi contains signal component Vs and noise component Vn to supply them to switch 1 and filter 2. The noise component of more than 3h Hz, for example, is contained in the output of filter 2 and then detected 3 to be applied to voltage comparator 4. At the samt time, AGC voltage VAGC of the receiver is supplied to comparator 4 to be compared with noise voltage VN. Based on this comparison result, switch 1 is turned on and off. As a result, the minimum S/N can be secured at all times.
JP5954178A 1978-05-19 1978-05-19 Squelch circuit Pending JPS54150908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5954178A JPS54150908A (en) 1978-05-19 1978-05-19 Squelch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5954178A JPS54150908A (en) 1978-05-19 1978-05-19 Squelch circuit

Publications (1)

Publication Number Publication Date
JPS54150908A true JPS54150908A (en) 1979-11-27

Family

ID=13116217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5954178A Pending JPS54150908A (en) 1978-05-19 1978-05-19 Squelch circuit

Country Status (1)

Country Link
JP (1) JPS54150908A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020053786A (en) * 2018-09-26 2020-04-02 株式会社日立国際電気 wireless device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020053786A (en) * 2018-09-26 2020-04-02 株式会社日立国際電気 wireless device

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