JPS5571307A - Automatic sound volume adjustment unit - Google Patents

Automatic sound volume adjustment unit

Info

Publication number
JPS5571307A
JPS5571307A JP14494378A JP14494378A JPS5571307A JP S5571307 A JPS5571307 A JP S5571307A JP 14494378 A JP14494378 A JP 14494378A JP 14494378 A JP14494378 A JP 14494378A JP S5571307 A JPS5571307 A JP S5571307A
Authority
JP
Japan
Prior art keywords
sound volume
signals
output
sound
level
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
JP14494378A
Other languages
Japanese (ja)
Other versions
JPS6210443B2 (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 JP14494378A priority Critical patent/JPS5571307A/en
Priority to GB7927311A priority patent/GB2029141A/en
Priority to US06/064,384 priority patent/US4254303A/en
Priority to SE7907070A priority patent/SE7907070L/en
Priority to FR7921366A priority patent/FR2435879A1/en
Priority to DE19792934593 priority patent/DE2934593A1/en
Publication of JPS5571307A publication Critical patent/JPS5571307A/en
Publication of JPS6210443B2 publication Critical patent/JPS6210443B2/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 automatically the sound volume of a speaker according to a peripheral noise level by adjusting the sound volume of sound signals by the subtraction output if the output-side sound signal of a sound volume adjustment equipment has a value larger than the larger voltage value of two comparators and stopping the adjustment function otherwise. CONSTITUTION:Level comparators 13 and 14 compare the level of signals which are converted from output-side sound signals of sound volume adjustment epuipment 3. If the level of signals which are converted from output-side sound signals of sound volume adjustment equipment 3 is larger than the larger one of respective comparison voltage of comparators 13 and 14, the subtraction output is stored and held, and the storage holding function is released repeatedly for a fixed time at a fixed period to adjust the sound volume of sound signals by the subtraction output. Meanwhile, if the level of signals which are converted from output-side sound signals of adjustment equipment 3 is smaller than the smaller one of respective comparison voltages of comparators 13 and 14, the subtraction output is set to zero to stop the adjustment function of adjustment equipment 3. As a result, the sound volume of a speaker can be adjusted automatically according to the peripheral noise level.
JP14494378A 1978-08-26 1978-11-25 Automatic sound volume adjustment unit Granted JPS5571307A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP14494378A JPS5571307A (en) 1978-11-25 1978-11-25 Automatic sound volume adjustment unit
GB7927311A GB2029141A (en) 1978-08-26 1979-08-06 Gain control arrangements
US06/064,384 US4254303A (en) 1978-08-26 1979-08-08 Automatic volume adjusting apparatus
SE7907070A SE7907070L (en) 1978-08-26 1979-08-24 AUTOMATIC VOLUME ADJUSTMENT DEVICE
FR7921366A FR2435879A1 (en) 1978-08-26 1979-08-24 APPARATUS FOR AUTOMATIC SOUND VOLUME ADJUSTMENT BASED ON VARIATIONS IN THE LEVEL OF AMBIENT NOISE
DE19792934593 DE2934593A1 (en) 1978-08-26 1979-08-27 AUTOMATIC VOLUME CONTROL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14494378A JPS5571307A (en) 1978-11-25 1978-11-25 Automatic sound volume adjustment unit

Publications (2)

Publication Number Publication Date
JPS5571307A true JPS5571307A (en) 1980-05-29
JPS6210443B2 JPS6210443B2 (en) 1987-03-06

Family

ID=15373784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14494378A Granted JPS5571307A (en) 1978-08-26 1978-11-25 Automatic sound volume adjustment unit

Country Status (1)

Country Link
JP (1) JPS5571307A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006229440A (en) * 2005-02-16 2006-08-31 Audio Technica Corp Microphone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006229440A (en) * 2005-02-16 2006-08-31 Audio Technica Corp Microphone

Also Published As

Publication number Publication date
JPS6210443B2 (en) 1987-03-06

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