JPS553261A - Automatic sound volume adjusting device - Google Patents

Automatic sound volume adjusting device

Info

Publication number
JPS553261A
JPS553261A JP7585678A JP7585678A JPS553261A JP S553261 A JPS553261 A JP S553261A JP 7585678 A JP7585678 A JP 7585678A JP 7585678 A JP7585678 A JP 7585678A JP S553261 A JPS553261 A JP S553261A
Authority
JP
Japan
Prior art keywords
external noise
speaker
sound volume
amplifier
acoustic device
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
JP7585678A
Other languages
Japanese (ja)
Inventor
Kiyoshi Amasawa
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP7585678A priority Critical patent/JPS553261A/en
Publication of JPS553261A publication Critical patent/JPS553261A/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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To secure an automatic adjustment for the sound volume of the acoustic device according to the external noise by utilizing the speaker as the microphone and thus to stabilize the acoustic device to the substantial external noise without any external connection to the car or the like. CONSTITUTION:The following units are provided: speaker 5 conncted to power amplifier 1; differential amplifier 4 which supplies the adverse electromotive force induced by the external noise of speaker 5 via differential amplifiers 2 and 3 and then detects the reverse electromotive force by the output amplifiers 2 and 3; band pass filter 6; and voltage divider 7. Thus the output of divider 7 is applied to variable resistance element 9 via DC converter 8 to ensure the automatic control for the gain of amplifier 1. Then the output of amplifier 1 is controlled automatically according to the external noise delivered from speaker 5. In such way, the sound volume of the acoustic device can be controlled automatically to the external noise.
JP7585678A 1978-06-22 1978-06-22 Automatic sound volume adjusting device Pending JPS553261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7585678A JPS553261A (en) 1978-06-22 1978-06-22 Automatic sound volume adjusting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7585678A JPS553261A (en) 1978-06-22 1978-06-22 Automatic sound volume adjusting device

Publications (1)

Publication Number Publication Date
JPS553261A true JPS553261A (en) 1980-01-11

Family

ID=13588280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7585678A Pending JPS553261A (en) 1978-06-22 1978-06-22 Automatic sound volume adjusting device

Country Status (1)

Country Link
JP (1) JPS553261A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140333A2 (en) * 1983-10-28 1985-05-08 Alcatel N.V. Sound reproducing system
EP0898441A2 (en) * 1997-08-16 1999-02-24 Robert Bosch Gmbh Method for inputting acoustic signals into an electric apparatus ans electric apparatus
US6473509B2 (en) 2000-05-23 2002-10-29 Daimlerchrysler Ag Audio system, in particular for motor vehicles

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498431A (en) * 1972-03-27 1974-01-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498431A (en) * 1972-03-27 1974-01-25

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140333A2 (en) * 1983-10-28 1985-05-08 Alcatel N.V. Sound reproducing system
EP0140333A3 (en) * 1983-10-28 1985-10-02 Alcatel N.V. Sound reproducing system
EP0898441A2 (en) * 1997-08-16 1999-02-24 Robert Bosch Gmbh Method for inputting acoustic signals into an electric apparatus ans electric apparatus
EP0898441A3 (en) * 1997-08-16 2005-06-22 Robert Bosch Gmbh Method for inputting acoustic signals into an electric apparatus ans electric apparatus
US6473509B2 (en) 2000-05-23 2002-10-29 Daimlerchrysler Ag Audio system, in particular for motor vehicles

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