JPS56100596A - Howling suppression control device - Google Patents
Howling suppression control deviceInfo
- Publication number
- JPS56100596A JPS56100596A JP279180A JP279180A JPS56100596A JP S56100596 A JPS56100596 A JP S56100596A JP 279180 A JP279180 A JP 279180A JP 279180 A JP279180 A JP 279180A JP S56100596 A JPS56100596 A JP S56100596A
- Authority
- JP
- Japan
- Prior art keywords
- gain
- signal
- howling
- input signal
- loudening
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
PURPOSE:To suppress howling, by recognizing the howling signal waveform from the loudening signal taken out from an arbitrary position of the loop circulating once in the signal loudening system to change the gain of the signal transmission system. CONSTITUTION:When the howling waveform in the input signal is recognized from the amplitude value of the input signal for change of the primary differential output of the input signal, the gain of variable gain amplifier VA at this time is stored in memory MEM; and meanwhile, the variable gain amplifier is set to a gain lower than the gain stored in memory MEM again after gain control signal generating device CSG reduces the gain of the variable gain amplifier for a fixed time width determined previously.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP279180A JPS56100596A (en) | 1980-01-14 | 1980-01-14 | Howling suppression control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP279180A JPS56100596A (en) | 1980-01-14 | 1980-01-14 | Howling suppression control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56100596A true JPS56100596A (en) | 1981-08-12 |
JPS6121039B2 JPS6121039B2 (en) | 1986-05-24 |
Family
ID=11539176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP279180A Granted JPS56100596A (en) | 1980-01-14 | 1980-01-14 | Howling suppression control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56100596A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4493101A (en) * | 1981-10-14 | 1985-01-08 | Shigetaro Muraoka | Anti-howl back device |
JPS6337748A (en) * | 1986-07-31 | 1988-02-18 | Juki Corp | Transmitting and receiving circuit of speaker phone for telephone set |
JPS63134480A (en) * | 1986-11-20 | 1988-06-07 | 株式会社日立ビルシステムサービス | Emergency talking device for elevator |
JPH01319354A (en) * | 1988-06-20 | 1989-12-25 | Fujitsu Ten Ltd | Reception level adjusting system in communication equipment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6322639U (en) * | 1986-07-24 | 1988-02-15 |
-
1980
- 1980-01-14 JP JP279180A patent/JPS56100596A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4493101A (en) * | 1981-10-14 | 1985-01-08 | Shigetaro Muraoka | Anti-howl back device |
JPS6337748A (en) * | 1986-07-31 | 1988-02-18 | Juki Corp | Transmitting and receiving circuit of speaker phone for telephone set |
JPH0355069B2 (en) * | 1986-07-31 | 1991-08-22 | ||
JPS63134480A (en) * | 1986-11-20 | 1988-06-07 | 株式会社日立ビルシステムサービス | Emergency talking device for elevator |
JPH01319354A (en) * | 1988-06-20 | 1989-12-25 | Fujitsu Ten Ltd | Reception level adjusting system in communication equipment |
Also Published As
Publication number | Publication date |
---|---|
JPS6121039B2 (en) | 1986-05-24 |
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