JPH0145769B2 - - Google Patents

Info

Publication number
JPH0145769B2
JPH0145769B2 JP17375682A JP17375682A JPH0145769B2 JP H0145769 B2 JPH0145769 B2 JP H0145769B2 JP 17375682 A JP17375682 A JP 17375682A JP 17375682 A JP17375682 A JP 17375682A JP H0145769 B2 JPH0145769 B2 JP H0145769B2
Authority
JP
Japan
Prior art keywords
circuit
loss
variable
level
level detection
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.)
Expired
Application number
JP17375682A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5977710A (ja
Inventor
Yozo Sudo
Takumi Takayama
Masaya Iguchi
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 JPS5977710A (ja) 1984-05-04
JPH0145769B2 true JPH0145769B2 (zh) 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 (zh)

Families Citing this family (10)

* 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
EP0290952B1 (de) * 1987-05-15 1992-11-04 Alcatel SEL Aktiengesellschaft Schaltungsanordnung zur Sprachsteuerung für ein Endgerät der Nachrichtentechnik
US4959857A (en) * 1988-12-28 1990-09-25 At&T Bell Laboratories Acoustic calibration arrangement for a voice switched speakerphone
EP0419127A3 (en) * 1989-09-20 1991-10-09 Gennum Corporation Noise suppression system
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
JP5688547B2 (ja) 2010-11-22 2015-03-25 パナソニックＩｐマネジメント株式会社 音声処理装置、収音装置及び撮像装置

Also Published As

Publication number Publication date
JPS5977710A (ja) 1984-05-04

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