JPS56144641A - Muting device of car-mounted radio - Google Patents

Muting device of car-mounted radio

Info

Publication number
JPS56144641A
JPS56144641A JP4756180A JP4756180A JPS56144641A JP S56144641 A JPS56144641 A JP S56144641A JP 4756180 A JP4756180 A JP 4756180A JP 4756180 A JP4756180 A JP 4756180A JP S56144641 A JPS56144641 A JP S56144641A
Authority
JP
Japan
Prior art keywords
signal
level
detecting circuit
low
output
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
JP4756180A
Other languages
Japanese (ja)
Inventor
Nobuo Ichikawa
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.)
ARUPAIN KK
Alpine Electronics Inc
Original Assignee
ARUPAIN KK
Alpine Electronics Inc
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 ARUPAIN KK, Alpine Electronics Inc filed Critical ARUPAIN KK
Priority to JP4756180A priority Critical patent/JPS56144641A/en
Publication of JPS56144641A publication Critical patent/JPS56144641A/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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate the discontinuity of a signal accompanying fluctuations of electric field intensity, by making the output of a level detecting circuit, generating a DC voltage in proportion to an IF signal level, correspond to the magnitude of an IF signal by controlling transistors (TR) with the output of the detecting circuit. CONSTITUTION:In an area where the input level of antenna 1 is low, the DC voltage of level detecting circuit 6, which generates a DC voltage proportional to an IF signal level, connected to the base of TR11 is low. Then, the emitter of TR11 and the base of TR13 are held at the earth potential and the amplification factor of TR10 amplifying the output signal of detecting circuit 5 is low, but respective resistance values are so set that any discontinuity state does not occur. As the input level of antenna 1 rises, the amplification factor of TR10 increases gradually and then fixes above a prescribed level. Consequently, even if the intensity of an electric field fluctuates greatly, the signal is never excluded, so that accurate information can be obtained.
JP4756180A 1980-04-11 1980-04-11 Muting device of car-mounted radio Pending JPS56144641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4756180A JPS56144641A (en) 1980-04-11 1980-04-11 Muting device of car-mounted radio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4756180A JPS56144641A (en) 1980-04-11 1980-04-11 Muting device of car-mounted radio

Publications (1)

Publication Number Publication Date
JPS56144641A true JPS56144641A (en) 1981-11-11

Family

ID=12778612

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4756180A Pending JPS56144641A (en) 1980-04-11 1980-04-11 Muting device of car-mounted radio

Country Status (1)

Country Link
JP (1) JPS56144641A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190415A (en) * 1998-12-14 2009-08-27 Eastman Kodak Co Droplet generator for inkjet printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190415A (en) * 1998-12-14 2009-08-27 Eastman Kodak Co Droplet generator for inkjet printer

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