JPS5535590A - Automatic sound volume control device - Google Patents

Automatic sound volume control device

Info

Publication number
JPS5535590A
JPS5535590A JP11007178A JP11007178A JPS5535590A JP S5535590 A JPS5535590 A JP S5535590A JP 11007178 A JP11007178 A JP 11007178A JP 11007178 A JP11007178 A JP 11007178A JP S5535590 A JPS5535590 A JP S5535590A
Authority
JP
Japan
Prior art keywords
mike
processor
speaker
amplifier
output
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
JP11007178A
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 JP11007178A priority Critical patent/JPS5535590A/en
Publication of JPS5535590A publication Critical patent/JPS5535590A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE: To ensure generation of the necessary sound volume which overcomes the external jamming sound by providing the variable delay means to prevent the permanent increment of the sound volume sent from the speaker due to the mike, and then to return to the original sound pressure when no jamming sound exists.
CONSTITUTION: The input given from signal source 1 is supplied to speaker 4 via variable gain amplifier 3, and the signal is generared from speaker 4. Then mike 9 to collect the external noise is installed to the circuit of such constitution, and the output of mike 5 is applied to processor 9 via amplifier 6. The input signal to be applied to speaker 4 via variable delay means 10 is supplied to the other input of processor 9, and the output of processor 9 is applied to amplifier 3 as its gain control signal. In case no external noise exists, the sound wave transmission time is made identical between mike 5 and speaker 4 via the delay means, and at the same time the output is made equal to the input for processor 9. Also in case the position of mike 5 changes toward the noise, the value of means 10 is varied to generate the output of processor 9. Thus the gain of amplifier 3 is controlled to the optimum value.
COPYRIGHT: (C)1980,JPO&Japio
JP11007178A 1978-09-06 1978-09-06 Automatic sound volume control device Pending JPS5535590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11007178A JPS5535590A (en) 1978-09-06 1978-09-06 Automatic sound volume control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11007178A JPS5535590A (en) 1978-09-06 1978-09-06 Automatic sound volume control device

Publications (1)

Publication Number Publication Date
JPS5535590A true JPS5535590A (en) 1980-03-12

Family

ID=14526303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11007178A Pending JPS5535590A (en) 1978-09-06 1978-09-06 Automatic sound volume control device

Country Status (1)

Country Link
JP (1) JPS5535590A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619110A (en) * 1993-06-04 1997-04-08 Kao Corporation Safety ensuring apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619110A (en) * 1993-06-04 1997-04-08 Kao Corporation Safety ensuring apparatus

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