JPS56100596A - Howling suppression control device - Google Patents

Howling suppression control device

Info

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
Application number
JP279180A
Other languages
Japanese (ja)
Other versions
JPS6121039B2 (en
Inventor
Hiroyuki Takekura
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP279180A priority Critical patent/JPS56100596A/en
Publication of JPS56100596A publication Critical patent/JPS56100596A/en
Publication of JPS6121039B2 publication Critical patent/JPS6121039B2/ja
Granted legal-status Critical Current

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.
JP279180A 1980-01-14 1980-01-14 Howling suppression control device Granted JPS56100596A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6322639U (en) * 1986-07-24 1988-02-15

Cited By (5)

* Cited by examiner, † Cited by third party
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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