IT1272056B - Circuito per conversazione telefonica a mani libere - Google Patents

Circuito per conversazione telefonica a mani libere

Info

Publication number
IT1272056B
IT1272056B ITTO930885A ITTO930885A IT1272056B IT 1272056 B IT1272056 B IT 1272056B IT TO930885 A ITTO930885 A IT TO930885A IT TO930885 A ITTO930885 A IT TO930885A IT 1272056 B IT1272056 B IT 1272056B
Authority
IT
Italy
Prior art keywords
attenuator
hands
circuit
reception
variable
Prior art date
Application number
ITTO930885A
Other languages
English (en)
Inventor
Takashi Shiono
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of ITTO930885A0 publication Critical patent/ITTO930885A0/it
Publication of ITTO930885A1 publication Critical patent/ITTO930885A1/it
Application granted granted Critical
Publication of IT1272056B publication Critical patent/IT1272056B/it

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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • 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)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un circuito per la conversazione telefonica a mani libere viene montato tra un corpo principale di un telefono per l'uso in un veicolo, ed un altoparlante ed un microfono per realizzare la conversazione telefonica a mani libere di un utilizzatore del telefono. Nel circuito, un volume elettronico è un volume per l'uso nell'elaborazione di un segnale audio, ed il volume elettronico include un attenuatore variabile di trasmissione, un attenuatore variabile di ricezione, ed un dispositivo di controllo dell'attenuatore. Viene fornito un rilevatore del livello di ricezione per rilevare un livello del segnale di un segnale di ricezione dal corpo principale del telefono, e diminuisce l'attenuazione dell'attenuatore variabile di ricezione ed aumenta l'attenuazione dell'attenuatore variabile di trasmissione quanto viene rilevato un livello di segnale alto.
ITTO930885A 1993-01-19 1993-11-25 Circuito per conversazione telefonica a mani libere IT1272056B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5023190A JPH06216986A (ja) 1993-01-19 1993-01-19 ハンズフリー通話回路

Publications (3)

Publication Number Publication Date
ITTO930885A0 ITTO930885A0 (it) 1993-11-25
ITTO930885A1 ITTO930885A1 (it) 1995-05-25
IT1272056B true IT1272056B (it) 1997-06-11

Family

ID=12103746

Family Applications (1)

Application Number Title Priority Date Filing Date
ITTO930885A IT1272056B (it) 1993-01-19 1993-11-25 Circuito per conversazione telefonica a mani libere

Country Status (4)

Country Link
US (1) US5559880A (it)
JP (1) JPH06216986A (it)
GB (1) GB2274375B (it)
IT (1) IT1272056B (it)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07297900A (ja) * 1994-04-26 1995-11-10 Mitsubishi Electric Corp 騒音対策通話機
US5857019A (en) * 1996-06-11 1999-01-05 Siemens Business Communication Systems, Inc. Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
FR2754663A1 (fr) * 1996-10-10 1998-04-17 Philips Electronics Nv Appareil telephonique muni de moyens de controle automatique de gain
US5787165A (en) * 1996-12-13 1998-07-28 Ericsson Inc. Handsfree radiotelephone having dynamic path attenuation control for echo suppression
TW391092B (en) 1996-12-27 2000-05-21 Hitachi Ltd Cellular mobile telephone apparatus and method for transmitting a response message to an caller
US6823182B1 (en) 1996-12-27 2004-11-23 Hitachi, Ltd. Cellular mobile telephone apparatus
WO1998058448A1 (en) * 1997-06-16 1998-12-23 Telefonaktiebolaget Lm Ericsson Method and apparatus for low complexity noise reduction
US5991398A (en) * 1998-04-17 1999-11-23 Ameritech Corporation Telephone terminal apparatus and method
US7346374B2 (en) 1999-05-26 2008-03-18 Johnson Controls Technology Company Wireless communications system and method
EP1852836A3 (en) 1999-05-26 2011-03-30 Johnson Controls Technology Company Wireless communications system and method
FR2808154B1 (fr) * 2000-04-21 2002-09-20 Sagem Telephone mobile sans souffle
US20030013501A1 (en) * 2001-07-12 2003-01-16 Ron Malhotra Apparatus for hands free operation of a mobile telephone
WO2009082378A2 (en) 2006-10-11 2009-07-02 Johnson Controls Technology Company Wireless network selection

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5368001A (en) * 1976-11-30 1978-06-17 Iriichi Tsuushin Kougiyou Kk Vodas controller
GB2122851B (en) * 1982-06-10 1986-03-19 Standard Telephones Cables Ltd Loudspeaking telephones
JPS6062733A (ja) * 1983-09-16 1985-04-10 Yaesu Musen Co Ltd 音声信号送出方法
DE3412111A1 (de) * 1984-03-31 1985-10-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung fuer eine sprachgesteuerte freisprecheinrichtung
JPS60223260A (ja) * 1984-04-19 1985-11-07 Taiko Denki Seisakusho:Kk 拡声電話機回路
JPS6167357A (ja) * 1984-09-11 1986-04-07 Matsushita Electric Ind Co Ltd ハンドフリ−電話装置
JPS61161856A (ja) * 1985-01-11 1986-07-22 Matsushita Electric Ind Co Ltd 拡声電話装置
JPS61195054A (ja) * 1985-02-25 1986-08-29 Matsushita Electric Works Ltd 拡声電話機の音声スイツチ回路
JPS6212249A (ja) * 1985-07-09 1987-01-21 Toa Tokushu Denki Kk 音声スイツチ装置
US4726062A (en) * 1985-12-11 1988-02-16 Harris Corporation Duplex hands-free communications circuit
US4724540A (en) * 1986-09-02 1988-02-09 Motorola, Inc. Speakerphone with fast idle mode
JPS6379450A (ja) * 1986-09-22 1988-04-09 Nec Corp 電話機
GB2197166A (en) * 1986-11-07 1988-05-11 Storno As Controlling gain in speech-controlled telephones
JPS63166346A (ja) * 1986-12-27 1988-07-09 Fujitsu Ltd 多周波数比較型ハンズフリ−回路
ES2037128T3 (es) * 1987-05-15 1993-06-16 Alcatel N.V. Circuito de control de voz para un terminal de telecomunicaciones.
JPS6420767A (en) * 1987-07-16 1989-01-24 Matsushita Electric Ind Co Ltd Voice switch device
JP2751244B2 (ja) * 1988-02-18 1998-05-18 日本電気株式会社 ハンズフリー回路及びハンズフリー制御方式
US4879745A (en) * 1988-10-12 1989-11-07 Ibm Corporation Half-duplex speakerphone
FR2641150B1 (it) * 1988-12-28 1991-04-19 Sgs Thomson Microelectronics
US5235637A (en) * 1989-01-26 1993-08-10 Plantronics, Inc. Voice communication link interface
JP3076072B2 (ja) * 1991-02-19 2000-08-14 日本電気株式会社 拡声電話装置および該装置に用いる騒音抑圧回路
CA2052351C (en) * 1991-09-27 2000-05-23 Gordon J. Reesor Telephone handsfree algorithm
DE4212078A1 (de) * 1992-04-10 1993-10-14 Stabilus Gmbh Endlagendämpfer

Also Published As

Publication number Publication date
JPH06216986A (ja) 1994-08-05
ITTO930885A1 (it) 1995-05-25
GB9324945D0 (en) 1994-01-26
GB2274375A (en) 1994-07-20
GB2274375B (en) 1997-05-28
ITTO930885A0 (it) 1993-11-25
US5559880A (en) 1996-09-24

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19971129