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JPS57115010A - Automatic sound volume adjuster - Google Patents

Automatic sound volume adjuster

Info

Publication number
JPS57115010A
JPS57115010A JP167181A JP167181A JPS57115010A JP S57115010 A JPS57115010 A JP S57115010A JP 167181 A JP167181 A JP 167181A JP 167181 A JP167181 A JP 167181A JP S57115010 A JPS57115010 A JP S57115010A
Authority
JP
Japan
Prior art keywords
sound volume
noise
signal
speaker
microphone
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
JP167181A
Other languages
Japanese (ja)
Inventor
Isamu Yokoyama
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 JP167181A priority Critical patent/JPS57115010A/en
Publication of JPS57115010A publication Critical patent/JPS57115010A/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 obtain sound volume in accordance with the amount of external noise, by controlling the gain of an amplifier through a signal which is obtained from the subtraction of an output of speaker from a signal detected at a microphone. CONSTITUTION:A microphone 1 detects speaker sound and external noise. On the other hand, a signal corresponding to the speaker sound is picked up at a car-mounted audio equipment 4, it is detected at a wave detection circuit 5, and levels lower than a specified level are cut off at a level setting circuit 6. Only noise component can be given to the input of an integral network, by controlling a switching circuit 3 with the output signal of the level setting circuit 6. A gain control voltage is obtained by integrating the noise component at an integral network. The sound volume can be adjusted automatically in accordance with noise through this voltage.
JP167181A 1981-01-08 1981-01-08 Automatic sound volume adjuster Pending JPS57115010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP167181A JPS57115010A (en) 1981-01-08 1981-01-08 Automatic sound volume adjuster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP167181A JPS57115010A (en) 1981-01-08 1981-01-08 Automatic sound volume adjuster

Publications (1)

Publication Number Publication Date
JPS57115010A true JPS57115010A (en) 1982-07-17

Family

ID=11507975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP167181A Pending JPS57115010A (en) 1981-01-08 1981-01-08 Automatic sound volume adjuster

Country Status (1)

Country Link
JP (1) JPS57115010A (en)

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