JPS5977710A - マイクロホン増巾回路 - Google Patents

マイクロホン増巾回路

Info

Publication number
JPS5977710A
JPS5977710A JP17375682A JP17375682A JPS5977710A JP S5977710 A JPS5977710 A JP S5977710A JP 17375682 A JP17375682 A JP 17375682A JP 17375682 A JP17375682 A JP 17375682A JP S5977710 A JPS5977710 A JP S5977710A
Authority
JP
Japan
Prior art keywords
circuit
loss
variable
output
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
JP17375682A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0145769B2 (enExample
Inventor
Yozo Sudo
須藤　洋三
Takumi Takayama
巧 高山
Masaya Iguchi
井口　政也
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17375682A priority Critical patent/JPS5977710A/ja
Publication of JPS5977710A publication Critical patent/JPS5977710A/ja
Publication of JPH0145769B2 publication Critical patent/JPH0145769B2/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)
  • Circuit For Audible Band Transducer (AREA)
JP17375682A 1982-10-02 1982-10-02 マイクロホン増巾回路 Granted JPS5977710A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17375682A JPS5977710A (ja) 1982-10-02 1982-10-02 マイクロホン増巾回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17375682A JPS5977710A (ja) 1982-10-02 1982-10-02 マイクロホン増巾回路

Publications (2)

Publication Number Publication Date
JPS5977710A true JPS5977710A (ja) 1984-05-04
JPH0145769B2 JPH0145769B2 (enExample) 1989-10-04

Family

ID=15966550

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17375682A Granted JPS5977710A (ja) 1982-10-02 1982-10-02 マイクロホン増巾回路

Country Status (1)

Country Link
JP (1) JPS5977710A (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60126950A (ja) * 1983-12-13 1985-07-06 Toshiba Corp 拡声電話装置
JPS61208951A (ja) * 1985-03-13 1986-09-17 Sharp Corp 拡声電話機
JPS61242499A (ja) * 1985-04-19 1986-10-28 シユア・ブラザ−ズ・インコ−ポレイテツド マイクロホン装置
JPS6339249A (ja) * 1986-08-05 1988-02-19 Nec Corp 周囲騒音感応型電話機
JPS63314943A (ja) * 1987-05-15 1988-12-22 アルカテル・エヌ・ブイ ボリュームレンジ制御回路
JPH02264548A (ja) * 1988-12-28 1990-10-29 American Teleph & Telegr Co <Att> 音響環境の型の確認方法
JPH0744881U (ja) * 1992-12-25 1995-11-28 ホシデン株式会社 マイクロホン用増幅器
EP1806840A1 (de) * 2006-01-05 2007-07-11 Siemens Schweiz AG Adaptive Verstärkung zur Kontrolle der Sprechlautstärke
US8897462B2 (en) 2010-11-22 2014-11-25 Panasonic Corporation Audio processing apparatus, sound pickup apparatus and imaging apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60126950A (ja) * 1983-12-13 1985-07-06 Toshiba Corp 拡声電話装置
JPS61208951A (ja) * 1985-03-13 1986-09-17 Sharp Corp 拡声電話機
JPS61242499A (ja) * 1985-04-19 1986-10-28 シユア・ブラザ−ズ・インコ−ポレイテツド マイクロホン装置
JPS6339249A (ja) * 1986-08-05 1988-02-19 Nec Corp 周囲騒音感応型電話機
JPS63314943A (ja) * 1987-05-15 1988-12-22 アルカテル・エヌ・ブイ ボリュームレンジ制御回路
JPH02264548A (ja) * 1988-12-28 1990-10-29 American Teleph & Telegr Co <Att> 音響環境の型の確認方法
JPH0744881U (ja) * 1992-12-25 1995-11-28 ホシデン株式会社 マイクロホン用増幅器
EP1806840A1 (de) * 2006-01-05 2007-07-11 Siemens Schweiz AG Adaptive Verstärkung zur Kontrolle der Sprechlautstärke
US8897462B2 (en) 2010-11-22 2014-11-25 Panasonic Corporation Audio processing apparatus, sound pickup apparatus and imaging apparatus

Also Published As

Publication number Publication date
JPH0145769B2 (enExample) 1989-10-04

Similar Documents

Publication Publication Date Title
US3963868A (en) Loudspeaking telephone hysteresis and ambient noise control
GB2274958A (en) Video camera microphone circuits
JPH0783398B2 (ja) ハウリングの防止、検出、消去および判定を備えたセルラ電話のためのスピーカホン
JP3133659U (ja) 自動利得制御回路
JPS5977710A (ja) マイクロホン増巾回路
WO2002032356A8 (en) Transient processing for communication system
US6493450B1 (en) Intercom system including improved automatic squelch control for use in small aircraft and other high noise environments
JPH04278796A (ja) 外部環境適応型音量調整方法
JPH0786857A (ja) 自動車用再生装置の音量を周囲ノイズに適合調整するための方法および装置
EP0516220B1 (en) Electroacoustic amplifier arrangement and microphone arrangement to be used in the electroacoustic amplifier arrangement
JPH0480580B2 (enExample)
JPH0564290A (ja) 収音装置
JP3069572B2 (ja) 拡声電話機
JP2636897B2 (ja) ハンドフリー通話回路
JPH0937383A (ja) ハウリング防止回路
JPH06303328A (ja) 音声スイッチ装置
KR19990059602A (ko) 주위잡음의영향을고려한휴대폰
JPH055420B2 (enExample)
JP2574060B2 (ja) ボイススイッチ
JPH0748771B2 (ja) 拡声電話機
JPH0253310A (ja) 可変利得増幅回路
JP2500288Y2 (ja) Ａｍラジオ受信機
JPH03289743A (ja) 電話器
JP2839509B2 (ja) 電話装置
JPH03186006A (ja) 自動利得制御装置