JPS5531389A - Volume controller - Google Patents

Volume controller

Info

Publication number
JPS5531389A
JPS5531389A JP10574278A JP10574278A JPS5531389A JP S5531389 A JPS5531389 A JP S5531389A JP 10574278 A JP10574278 A JP 10574278A JP 10574278 A JP10574278 A JP 10574278A JP S5531389 A JPS5531389 A JP S5531389A
Authority
JP
Japan
Prior art keywords
amplifier
microphone
gain
output
external noise
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
JP10574278A
Other languages
Japanese (ja)
Inventor
Shiro Okamura
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP10574278A priority Critical patent/JPS5531389A/en
Publication of JPS5531389A publication Critical patent/JPS5531389A/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 an easy-to-hear sound even if the level of an external noise increases by controlling an amplifier depending nearly upon the external noise by canceling howling between a loud speaker and microphone. CONSTITUTION:Signal source 1 drives loud speaker 3 via variable amplifier 2. Microphone 4 is coupled with loud speaker 3 a loosely as possible by fixing its position and direction and sound insulating board 20 is provided at need. An input to microphone 4 is amplified by microphone amplifier 5 and then supplied to rectifying processor 6, which generates a control signal to control the gain of amplifier 2, so that when the output of the microphone increases in level due to an external noise, the output of amplifier 2 will be increased generally. However, a positive feedback state where the gain of amplifier 2 is held increased may occur when the increased volume of speaker 3 causes microphone 4 to generate its output and in this case, non-linear control, etc., which does not increase the gain of amplifier 2 above a certain value is recommended.
JP10574278A 1978-08-29 1978-08-29 Volume controller Pending JPS5531389A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10574278A JPS5531389A (en) 1978-08-29 1978-08-29 Volume controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10574278A JPS5531389A (en) 1978-08-29 1978-08-29 Volume controller

Publications (1)

Publication Number Publication Date
JPS5531389A true JPS5531389A (en) 1980-03-05

Family

ID=14415710

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10574278A Pending JPS5531389A (en) 1978-08-29 1978-08-29 Volume controller

Country Status (1)

Country Link
JP (1) JPS5531389A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651776U (en) * 1992-12-17 1994-07-15 オリオン機械株式会社 Panel frame fixing structure in fresh food storage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651776U (en) * 1992-12-17 1994-07-15 オリオン機械株式会社 Panel frame fixing structure in fresh food storage

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