JPS57133708A - Automatic sound volume adjuster - Google Patents

Automatic sound volume adjuster

Info

Publication number
JPS57133708A
JPS57133708A JP1892681A JP1892681A JPS57133708A JP S57133708 A JPS57133708 A JP S57133708A JP 1892681 A JP1892681 A JP 1892681A JP 1892681 A JP1892681 A JP 1892681A JP S57133708 A JPS57133708 A JP S57133708A
Authority
JP
Japan
Prior art keywords
level
circuit
inputted
output
sound volume
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
JP1892681A
Other languages
Japanese (ja)
Other versions
JPH025325B2 (en
Inventor
Tetsuya Takizawa
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.)
BIIBA KK
Original Assignee
BIIBA KK
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 BIIBA KK filed Critical BIIBA KK
Priority to JP1892681A priority Critical patent/JPS57133708A/en
Publication of JPS57133708A publication Critical patent/JPS57133708A/en
Publication of JPH025325B2 publication Critical patent/JPH025325B2/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 adjust sound volume automatically in accordance with noise level of surrounding even if the distance between a speaker and a microphone is closed, by detecting the surrounding noise with an input side audio signal. CONSTITUTION:The synthesized sound between the sound of a speaker 4 and surrounding noise is detected at a microphone 5 and inputted to a subtraction circuit 8 as a DC fluctuation output. On the other hand, the input audio signal of a sound volume adjusting circuit 2 is inputted to a signal level averaging circuit 11 as the DC fluctuation output and also to a level comparator 12. The average output of the signal level averaging circuit 11 is adjusted to a specified level at a level adjuster 13 and inputted to the level comparator 12. When the output level of a rectifying circuit 10 is a reference level or more, a storage circuit 15 holds this level. The output of the storage circuit 15 is subtracted from the referance level at a subtraction circuit 16 and inputted to an integral network 23. The integral network 23 makes high speed charging and low speed discharge. With the constitution like this, sound volume adjustment can be made automatically in accordance with the surrounding noise.
JP1892681A 1981-02-13 1981-02-13 Automatic sound volume adjuster Granted JPS57133708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1892681A JPS57133708A (en) 1981-02-13 1981-02-13 Automatic sound volume adjuster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1892681A JPS57133708A (en) 1981-02-13 1981-02-13 Automatic sound volume adjuster

Publications (2)

Publication Number Publication Date
JPS57133708A true JPS57133708A (en) 1982-08-18
JPH025325B2 JPH025325B2 (en) 1990-02-01

Family

ID=11985225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1892681A Granted JPS57133708A (en) 1981-02-13 1981-02-13 Automatic sound volume adjuster

Country Status (1)

Country Link
JP (1) JPS57133708A (en)

Also Published As

Publication number Publication date
JPH025325B2 (en) 1990-02-01

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