JPS56164698A - Loud speaker broadcasting device - Google Patents

Loud speaker broadcasting device

Info

Publication number
JPS56164698A
JPS56164698A JP6647580A JP6647580A JPS56164698A JP S56164698 A JPS56164698 A JP S56164698A JP 6647580 A JP6647580 A JP 6647580A JP 6647580 A JP6647580 A JP 6647580A JP S56164698 A JPS56164698 A JP S56164698A
Authority
JP
Japan
Prior art keywords
output
microphone
comparison circuit
microphones
loud speaker
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.)
Pending
Application number
JP6647580A
Other languages
Japanese (ja)
Inventor
Isamu Okui
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.)
Toshiba Electric Equipment Corp
Original Assignee
Toshiba Electric Equipment Corp
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 Toshiba Electric Equipment Corp filed Critical Toshiba Electric Equipment Corp
Priority to JP6647580A priority Critical patent/JPS56164698A/en
Publication of JPS56164698A publication Critical patent/JPS56164698A/en
Pending 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)

Abstract

PURPOSE:To make automatic adjustment of sound volume according to noise level at broadcast space, by comparing the output of broadcast use microphones and the noise detecting microphone and controlling the output of the former. CONSTITUTION:In a room providing together broadcast use microphones, a noise detection microphone 2 and a speaker 3, for example, a comparison circuit 4 compares the output of microphones 1, 2. If the output of the microphone 2 is greater than that of the microphone 1, the 2nd output is produced from the comparison circuit 4 to suppress the amplification factor of an amplifier A1. Conversely, if greater, the comparison circuit 4 produced the 1st output and adjusts the amplification factor of the amplifier A1 with a control circuit 5 according to the output of the microphone 2.
JP6647580A 1980-05-21 1980-05-21 Loud speaker broadcasting device Pending JPS56164698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6647580A JPS56164698A (en) 1980-05-21 1980-05-21 Loud speaker broadcasting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6647580A JPS56164698A (en) 1980-05-21 1980-05-21 Loud speaker broadcasting device

Publications (1)

Publication Number Publication Date
JPS56164698A true JPS56164698A (en) 1981-12-17

Family

ID=13316837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6647580A Pending JPS56164698A (en) 1980-05-21 1980-05-21 Loud speaker broadcasting device

Country Status (1)

Country Link
JP (1) JPS56164698A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019118046A (en) * 2017-12-27 2019-07-18 パナソニックＩｐマネジメント株式会社 Volume control device, volume control method, and volume control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019118046A (en) * 2017-12-27 2019-07-18 パナソニックＩｐマネジメント株式会社 Volume control device, volume control method, and volume control system
JP2021122157A (en) * 2017-12-27 2021-08-26 パナソニックＩｐマネジメント株式会社 Volume control device, volume control method, and volume control system

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