JPS56120207A - Audio equipment for car - Google Patents

Audio equipment for car

Info

Publication number
JPS56120207A
JPS56120207A JP2263980A JP2263980A JPS56120207A JP S56120207 A JPS56120207 A JP S56120207A JP 2263980 A JP2263980 A JP 2263980A JP 2263980 A JP2263980 A JP 2263980A JP S56120207 A JPS56120207 A JP S56120207A
Authority
JP
Japan
Prior art keywords
handset
signal
preamplifier
stand
audio
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
JP2263980A
Other languages
Japanese (ja)
Inventor
Takeo Tamura
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2263980A priority Critical patent/JPS56120207A/en
Publication of JPS56120207A publication Critical patent/JPS56120207A/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
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • 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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To save the trouble like sound volume decrease during call and to avoid the delay in response, by decreasing the sound volume of radio receiver in interlocking with the off-hook of a handset for car telephone. CONSTITUTION:The handset of a car telephone set is the type mounted on a stand, and a handset position detecting switch 5 is fitted to this stand. In an audio aquipment, the audio signal picked up from a tuner 11 or a signal from a tape recorder 14 is given to a preamplifier 13 via a radio cassette change-over switch 12. Further, the signal amplfied at the preamplifier 13 is fed to a power amplifier 16 via a volume 15 and a handset position detecting switch 5 and output from a speaker 17. Further, when the handset is picked up from the stand, the contact of the detection switch 5 is changed over, and since the output of the preamplifier 13 is input to a resistor 18 with greater resistance value, the audio output signal can automatically be reduced.
JP2263980A 1980-02-27 1980-02-27 Audio equipment for car Pending JPS56120207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2263980A JPS56120207A (en) 1980-02-27 1980-02-27 Audio equipment for car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2263980A JPS56120207A (en) 1980-02-27 1980-02-27 Audio equipment for car

Publications (1)

Publication Number Publication Date
JPS56120207A true JPS56120207A (en) 1981-09-21

Family

ID=12088402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2263980A Pending JPS56120207A (en) 1980-02-27 1980-02-27 Audio equipment for car

Country Status (1)

Country Link
JP (1) JPS56120207A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251849U (en) * 1985-09-20 1987-03-31
JPS6251847U (en) * 1985-09-20 1987-03-31
DE10257677A1 (en) * 2002-12-10 2004-06-24 Primax Electronics Ltd. Audio system has mute switching electronics for interrupting output via loudspeaker after receiving mute switching signal generated after detecting incoming mobile telephone call
CN106954137A (en) * 2017-01-04 2017-07-14 上海傅硅电子科技有限公司 A kind of double mode drive device for loudspeaker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031811B1 (en) * 1972-03-11 1975-10-15
JPS55135406A (en) * 1979-04-09 1980-10-22 Manabu Tsurumi Sound volume adjustor for speaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031811B1 (en) * 1972-03-11 1975-10-15
JPS55135406A (en) * 1979-04-09 1980-10-22 Manabu Tsurumi Sound volume adjustor for speaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251849U (en) * 1985-09-20 1987-03-31
JPS6251847U (en) * 1985-09-20 1987-03-31
DE10257677A1 (en) * 2002-12-10 2004-06-24 Primax Electronics Ltd. Audio system has mute switching electronics for interrupting output via loudspeaker after receiving mute switching signal generated after detecting incoming mobile telephone call
DE10257677B4 (en) * 2002-12-10 2008-04-17 Primax Electronics Ltd. Audio system with automatic mute
CN106954137A (en) * 2017-01-04 2017-07-14 上海傅硅电子科技有限公司 A kind of double mode drive device for loudspeaker

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