KR900011219A - 핸드프리기능을 갖춘 전화기용 제어장치 - Google Patents

핸드프리기능을 갖춘 전화기용 제어장치 Download PDF

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Publication number
KR900011219A
KR900011219A KR1019890018685A KR890018685A KR900011219A KR 900011219 A KR900011219 A KR 900011219A KR 1019890018685 A KR1019890018685 A KR 1019890018685A KR 890018685 A KR890018685 A KR 890018685A KR 900011219 A KR900011219 A KR 900011219A
Authority
KR
South Korea
Prior art keywords
compressor
channel
transistor
control device
gain
Prior art date
Application number
KR1019890018685A
Other languages
English (en)
Korean (ko)
Inventor
아르노 띠에르
Original Assignee
엘리자베드 아삐쯔
에스지에스-톰슨 마이크로일렉트로닉스 에스. 에이
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 엘리자베드 아삐쯔, 에스지에스-톰슨 마이크로일렉트로닉스 에스. 에이 filed Critical 엘리자베드 아삐쯔
Publication of KR900011219A publication Critical patent/KR900011219A/ko

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Telephone Function (AREA)
  • Control Of Amplification And Gain Control (AREA)
KR1019890018685A 1988-12-28 1989-12-15 핸드프리기능을 갖춘 전화기용 제어장치 KR900011219A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR88/17578 1988-12-28
FR8817578A FR2641150B1 (US06724976-20040420-M00002.png) 1988-12-28 1988-12-28

Publications (1)

Publication Number Publication Date
KR900011219A true KR900011219A (ko) 1990-07-11

Family

ID=9373703

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890018685A KR900011219A (ko) 1988-12-28 1989-12-15 핸드프리기능을 갖춘 전화기용 제어장치

Country Status (7)

Country Link
US (1) US4989242A (US06724976-20040420-M00002.png)
EP (1) EP0376866B1 (US06724976-20040420-M00002.png)
JP (1) JP3004301B2 (US06724976-20040420-M00002.png)
KR (1) KR900011219A (US06724976-20040420-M00002.png)
CA (1) CA2006190A1 (US06724976-20040420-M00002.png)
DE (1) DE68914125T2 (US06724976-20040420-M00002.png)
FR (1) FR2641150B1 (US06724976-20040420-M00002.png)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2001277C (en) * 1989-10-24 1994-07-12 Bruce Leigh Townsend Hands free telecommunications apparatus and method
US5172408A (en) * 1990-08-01 1992-12-15 At&T Bell Laboratories Speakerphone state-controlled alerting arrangement
US5075687A (en) * 1990-09-27 1991-12-24 Advanced Micro Devices, Inc. Echo suppression with both digital and analog variable attenuators
US5170430A (en) * 1991-01-04 1992-12-08 Schuh Peter O Voice-switched handset receive amplifier
CA2052351C (en) * 1991-09-27 2000-05-23 Gordon J. Reesor Telephone handsfree algorithm
JPH06216986A (ja) * 1993-01-19 1994-08-05 Mitsubishi Electric Corp ハンズフリー通話回路
JPH06338934A (ja) * 1993-05-25 1994-12-06 Exar Corp 事象駆動型制御回路を有するスピーカーホーン
US5319704A (en) * 1993-06-17 1994-06-07 Exar Corporation Control circuit for voltage controlled attenuator for speakerphones
FR2731123B1 (fr) * 1995-02-27 1997-05-09 Prescom Sarl Correction de gain de haut-parleur pour un terminal telephonique mains-libres
US5612996A (en) * 1995-09-21 1997-03-18 Rockwell International Corporation Loop gain processing system for speakerphone applications
JP4509413B2 (ja) * 2001-03-29 2010-07-21 株式会社東芝 電子機器
AU2003274468A1 (en) * 2002-11-15 2004-06-15 Koninklijke Philips Electronics N.V. Adaptive hysteresis for reduced swing signalling circuits
DE10321625B4 (de) * 2003-05-13 2007-08-23 Gehrke Kommunikationssyteme Gmbh Signalübertragungsvorrichtung und Verfahren zum Regeln einer Signalübertragungsvorrichtung
CN102075741B (zh) * 2010-12-14 2012-12-12 北京华环电子股份有限公司 一种图像传输方法、终端及系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5242643B2 (US06724976-20040420-M00002.png) * 1973-10-18 1977-10-26
JPS5411203B2 (US06724976-20040420-M00002.png) * 1974-05-02 1979-05-12
FR2481550B1 (fr) * 1980-04-25 1985-08-02 Trt Telecom Radio Electr Dispositif de protection contre l'effet larsen dans un poste telephonique a haut-parleur
JPS59193660A (ja) * 1983-04-18 1984-11-02 Nec Corp 会議電話装置
JPS59230356A (ja) * 1983-06-14 1984-12-24 Matsushita Electric Ind Co Ltd ハンドフリ−通話装置
FR2606958B1 (fr) * 1986-11-17 1988-12-23 Zurcher Frederic Circuit de transmission a double sens muni de moyens symetriques de variation automatique du gain selon le sens de transmission
US4843621A (en) * 1987-04-24 1989-06-27 Motorola, Inc. Speakerphone using digitally compressed audio to detect acoustic feedback
US4741018A (en) * 1987-04-24 1988-04-26 Motorola, Inc. Speakerphone using digitally compressed audio to control voice path gain
FR2618622B1 (fr) * 1987-07-21 1994-05-20 Thomson Semiconducteurs Circuit compresseur de signal, en particulier pour appareil telephonique
FR2618626B1 (fr) * 1987-07-21 1994-04-29 Thomson Semiconducteurs Dispositif de commande pour poste telephonique " mains libres "
US4879745A (en) * 1988-10-12 1989-11-07 Ibm Corporation Half-duplex speakerphone

Also Published As

Publication number Publication date
CA2006190A1 (en) 1990-06-28
EP0376866A1 (fr) 1990-07-04
EP0376866B1 (fr) 1994-03-23
US4989242A (en) 1991-01-29
DE68914125T2 (de) 1994-09-08
FR2641150B1 (US06724976-20040420-M00002.png) 1991-04-19
DE68914125D1 (de) 1994-04-28
JPH02222348A (ja) 1990-09-05
JP3004301B2 (ja) 2000-01-31
FR2641150A1 (US06724976-20040420-M00002.png) 1990-06-29

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Legal Events

Date Code Title Description
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid