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JPS57207410A - Automatic sound volume correcting device - Google Patents

Automatic sound volume correcting device

Info

Publication number
JPS57207410A
JPS57207410A JP9330781A JP9330781A JPS57207410A JP S57207410 A JPS57207410 A JP S57207410A JP 9330781 A JP9330781 A JP 9330781A JP 9330781 A JP9330781 A JP 9330781A JP S57207410 A JPS57207410 A JP S57207410A
Authority
JP
Japan
Prior art keywords
output
noise
signal
amplifying section
lpf
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.)
Granted
Application number
JP9330781A
Other languages
Japanese (ja)
Other versions
JPH0334244B2 (en
Inventor
Akio Tokuge
Masayuki Kato
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP9330781A priority Critical patent/JPS57207410A/en
Priority to US06/387,895 priority patent/US4476571A/en
Priority to DE19823222495 priority patent/DE3222495A1/en
Publication of JPS57207410A publication Critical patent/JPS57207410A/en
Publication of JPH0334244B2 publication Critical patent/JPH0334244B2/ja
Granted 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 perform sound volume control not providing feeling of unpleasantness to rapid change in surrounding noise, by providing a logarithmic amplifying section logarithmically compressing a noise level detecting signal and a time constant circuit inputting an output of the amplifying section. CONSTITUTION:When a noise in a car is increased, an output of a microphone M is correspondingly increased. The output of the microphone M is amplified to a specified value at a microphone amplifying section MA and applied to an LPF. The LPF picks up noise signals not subjected to the effect of signal tone and human voice by picking up the low frequency component of the noise signal in accordance with the audible sense of human being. A noise level detection section DET detects the output of the LPF as a voltage signal corresponding to the average value. The output signal of the DET is logarithmically compressed and outputted at a logarithmic amplifying section LA. A time constant circuit TC gives a time constant to the output of the LA and transmits the output as a control signal Vc absorbing a rapid change in the noise detecting signal.
JP9330781A 1981-06-15 1981-06-16 Automatic sound volume correcting device Granted JPS57207410A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP9330781A JPS57207410A (en) 1981-06-16 1981-06-16 Automatic sound volume correcting device
US06/387,895 US4476571A (en) 1981-06-15 1982-06-14 Automatic sound volume control device
DE19823222495 DE3222495A1 (en) 1981-06-15 1982-06-15 Automatic volume control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9330781A JPS57207410A (en) 1981-06-16 1981-06-16 Automatic sound volume correcting device

Publications (2)

Publication Number Publication Date
JPS57207410A true JPS57207410A (en) 1982-12-20
JPH0334244B2 JPH0334244B2 (en) 1991-05-22

Family

ID=14078670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9330781A Granted JPS57207410A (en) 1981-06-15 1981-06-16 Automatic sound volume correcting device

Country Status (1)

Country Link
JP (1) JPS57207410A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6529605B1 (en) 2000-04-14 2003-03-04 Harman International Industries, Incorporated Method and apparatus for dynamic sound optimization
JP2006148541A (en) * 2004-11-19 2006-06-08 Denso Corp Navigation device and program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4917950U (en) * 1972-05-26 1974-02-15
JPS5179537A (en) * 1975-01-07 1976-07-10 Mizukami Shizuya Terebijonnadoni mochiiru jidoonryochoseisochi

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4917950U (en) * 1972-05-26 1974-02-15
JPS5179537A (en) * 1975-01-07 1976-07-10 Mizukami Shizuya Terebijonnadoni mochiiru jidoonryochoseisochi

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6529605B1 (en) 2000-04-14 2003-03-04 Harman International Industries, Incorporated Method and apparatus for dynamic sound optimization
JP2006148541A (en) * 2004-11-19 2006-06-08 Denso Corp Navigation device and program

Also Published As

Publication number Publication date
JPH0334244B2 (en) 1991-05-22

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