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
level
output
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 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html
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

  • Circuit For Audible Band Transducer (AREA)
  • Control Of Amplification And Gain Control (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 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 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 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1989-10-04

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