JPS57157640A - Receiver - Google Patents

Receiver

Info

Publication number
JPS57157640A
JPS57157640A JP4273581A JP4273581A JPS57157640A JP S57157640 A JPS57157640 A JP S57157640A JP 4273581 A JP4273581 A JP 4273581A JP 4273581 A JP4273581 A JP 4273581A JP S57157640 A JPS57157640 A JP S57157640A
Authority
JP
Japan
Prior art keywords
circuit
time
squelch
smooths
utilizing
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
JP4273581A
Other languages
Japanese (ja)
Inventor
Mitsumasa Saito
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 JP4273581A priority Critical patent/JPS57157640A/en
Publication of JPS57157640A publication Critical patent/JPS57157640A/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)

Abstract

PURPOSE:To improve the operating time of a squelch circuit against stepwise changes in input, by utilizing a property that the response characteristic of an automating gain controlling circuit is sufficiently faster than that of the smoothing circuit which smooths unnecessary demodulation outputs. CONSTITUTION:By utilizing a property that the response characteristic of an automatic gain controlling circuit is sufficiently faster than that of a smoothing circuit 5 which smooths unnecessary demodulation outputs, conventional unnecessary demodulation outputs are detected, and by keeping the function which operates a squelch circuit as it is, the operating time of the squelch circuit against stepwise changes in input power corresponding to the transmission starting and stopping times of a transmission station, is shortened. Moreover, by operating a circuit 13 which generates a pulse voltage for a fixed time at the leading edge of the input signal, the time in which a switch 8 does not close and excessive noises are outputted due to the influence of the charging time of a conventional smoothing circuit 5, is sharply shortened and the demodulation output is normally outputted.
JP4273581A 1981-03-24 1981-03-24 Receiver Pending JPS57157640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4273581A JPS57157640A (en) 1981-03-24 1981-03-24 Receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4273581A JPS57157640A (en) 1981-03-24 1981-03-24 Receiver

Publications (1)

Publication Number Publication Date
JPS57157640A true JPS57157640A (en) 1982-09-29

Family

ID=12644285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4273581A Pending JPS57157640A (en) 1981-03-24 1981-03-24 Receiver

Country Status (1)

Country Link
JP (1) JPS57157640A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60187135A (en) * 1984-03-06 1985-09-24 Mitsubishi Electric Corp Squelch circuit
JP2013026887A (en) * 2011-07-22 2013-02-04 Dx Antenna Co Ltd Single channel amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60187135A (en) * 1984-03-06 1985-09-24 Mitsubishi Electric Corp Squelch circuit
JP2013026887A (en) * 2011-07-22 2013-02-04 Dx Antenna Co Ltd Single channel amplifier

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