JPS5571307A - Automatic sound volume adjustment unit - Google Patents
Automatic sound volume adjustment unitInfo
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006229440A (en) * | 2005-02-16 | 2006-08-31 | Audio Technica Corp | Microphone |
-
1978
- 1978-11-25 JP JP14494378A patent/JPS5571307A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006229440A (en) * | 2005-02-16 | 2006-08-31 | Audio Technica Corp | Microphone |
JP4508900B2 (en) * | 2005-02-16 | 2010-07-21 | 株式会社オーディオテクニカ | Microphone |
Also Published As
Publication number | Publication date |
---|---|
JPS6210443B2 (en) | 1987-03-06 |
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