FR2603397A1 - Circuit de commande comportant une boucle de commande en courant continu permettant de commander le gain d'un attenuateur - Google Patents

Circuit de commande comportant une boucle de commande en courant continu permettant de commander le gain d'un attenuateur

Info

Publication number
FR2603397A1
FR2603397A1 FR8712168A FR8712168A FR2603397A1 FR 2603397 A1 FR2603397 A1 FR 2603397A1 FR 8712168 A FR8712168 A FR 8712168A FR 8712168 A FR8712168 A FR 8712168A FR 2603397 A1 FR2603397 A1 FR 2603397A1
Authority
FR
France
Prior art keywords
circuit
current
attenuator
gain
direct current
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
FR8712168A
Other languages
English (en)
Other versions
FR2603397B1 (fr
Inventor
Wilson David Pace
Dennis Lee Welty
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of FR2603397A1 publication Critical patent/FR2603397A1/fr
Application granted granted Critical
Publication of FR2603397B1 publication Critical patent/FR2603397B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Amplifiers (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

POUR FIXER AVEC PRECISION LA TENSION DE COMMANDE MAXIMALE PRODUITE PAR UN CIRCUIT DE COMMANDE, AFIN DE RENDRE MAXIMAL LE GAIN D'UN ATTENUATEUR 12, 14 COMMANDE PAR LE CIRCUIT, ON UTILISE, EN RELATION AVEC CE CIRCUIT, UNE BOUCLE DE COMMANDE EN COURANT CONTINU 10. L'ATTENUATEUR COMPORTE UN MIROIR DE COURANT DONT LA SORTIE FOURNIT UN COURANT CONTINU D'INTENSITE PROPORTIONNELLE AU GAIN DE L'ATTENUATEUR, ET LE CIRCUIT DE COMMANDE COMPORTE UN CONDENSATEUR 52 QUI SE CHARGE OU SE DECHARGE POUR FAIRE VARIER LA TENSION DE COMMANDE. LA BOUCLE CONTIENT UN CIRCUIT SERVANT A ABSORBER, COMME DANS UN PUITS LE COURANT DELIVRE PAR LE MIROIR, CE CIRCUIT ETANT COUPLE A LA SORTIE DU MIROIR, AINSI QU'UN TRANSISTOR QUI DEVIENT CONDUCTEUR LORSQUE L'INTENSITE DU COURANT VENANT DU MIROIR EST EGALE A L'INTENSITE DU COURANT ABSORBEE PAR LE CIRCUIT, CE QUI EMPECHE LA POURSUITE DE LA CHARGE OU DE LA DECHARGE DU CONDENSATEUR ET MAINTIENT LE GAIN A UNE VALEUR MAXIMALE PREDETERMINEE.
FR878712168A 1986-09-02 1987-09-01 Circuit de commande comportant une boucle de commande en courant continu permettant de commander le gain d'un attenuateur Expired FR2603397B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/902,723 US4720856A (en) 1986-09-02 1986-09-02 Control circuit having a direct current control loop for controlling the gain of an attenuator

Publications (2)

Publication Number Publication Date
FR2603397A1 true FR2603397A1 (fr) 1988-03-04
FR2603397B1 FR2603397B1 (fr) 1989-07-07

Family

ID=25416303

Family Applications (1)

Application Number Title Priority Date Filing Date
FR878712168A Expired FR2603397B1 (fr) 1986-09-02 1987-09-01 Circuit de commande comportant une boucle de commande en courant continu permettant de commander le gain d'un attenuateur

Country Status (7)

Country Link
US (1) US4720856A (fr)
JP (1) JPH07112216B2 (fr)
KR (1) KR950014300B1 (fr)
FR (1) FR2603397B1 (fr)
GB (1) GB2194694B (fr)
HK (1) HK26792A (fr)
SG (1) SG20092G (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544242A (en) * 1993-05-25 1996-08-06 Exar Corporation Speakerphone with event driven control circuit

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151119A (ja) * 1986-12-15 1988-06-23 Nec Corp プレス検出回路
US5321746A (en) * 1991-02-28 1994-06-14 Motorola, Inc. Adjustable gain range current mirror
US5450618A (en) * 1992-04-30 1995-09-12 Motorola, Inc. Full duplex and half duplex communication unit with volume setting
US5365583A (en) * 1992-07-02 1994-11-15 Polycom, Inc. Method for fail-safe operation in a speaker phone system
US5319704A (en) * 1993-06-17 1994-06-07 Exar Corporation Control circuit for voltage controlled attenuator for speakerphones
KR100200967B1 (ko) * 1996-06-26 1999-06-15 윤종용 전화라인의 감쇄신호 보상장치 및 방법
JP2000502537A (ja) * 1996-10-04 2000-02-29 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ 電気通信システム、加入者ユニット、および加入者ユニットを具えるテレビジョン受像機
US6952912B2 (en) * 2000-08-11 2005-10-11 Airway Dynamics, Llc Method and device for analyzing respiratory sounds in horses
JP3987294B2 (ja) * 2001-03-16 2007-10-03 株式会社東芝 オフセット補償回路
US7405659B1 (en) * 2004-03-31 2008-07-29 Impinj, Inc. RFID tag switched capacitor slicer threshold
US20090084427A1 (en) * 2006-04-18 2009-04-02 Anderson Nicole R Copper Indium Diselenide-Based Photovoltaic Device And Method Of Preparing the Same
US20090090413A1 (en) * 2006-04-18 2009-04-09 Dimitris Elias Katsoulis Cadmium Telluride-Based Photovoltaic Device And Method Of Preparing The Same
DE602007003216D1 (de) * 2006-04-18 2009-12-24 Dow Corning Fotovoltaische anordnung auf kupfer-indium-diselenidbasis und herstellungsverfahren dafür
EP2114670A1 (fr) * 2007-02-22 2009-11-11 Dow Corning Corporation Article composite présentant une excellente résistance au feu
CN101646559A (zh) * 2007-02-22 2010-02-10 陶氏康宁公司 具有优良的耐火性和抗冲击性的复合制品及其制备方法
JP2010522649A (ja) * 2007-02-22 2010-07-08 ダウ・コーニング・コーポレイション 優れた耐火性を有する複合品

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1281499B (de) * 1966-03-23 1968-10-31 Siemens Ag Schaltungsanordnung fuer sprachgesteuerte Freisprechgeraete mit veraenderbarem Daempfungshub
FR2210872A1 (fr) * 1972-12-18 1974-07-12 Ericsson Telefon Ab L M
FR2261669A1 (en) * 1974-02-14 1975-09-12 Girard J Philippe Telephone equipment self-energising protection device - can compensate the Larsen effect in lines with ear-piece
DE3218501A1 (de) * 1981-12-05 1983-11-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur gegensinnigen verstaerkungssteuerung
FR2527403A1 (fr) * 1982-05-21 1983-11-25 Mitel Corp Systeme et circuit de telephone a haut-parleur

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412111A1 (de) * 1984-03-31 1985-10-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung fuer eine sprachgesteuerte freisprecheinrichtung
US4608462A (en) * 1984-06-29 1986-08-26 International Standard Electric Corporation Telephone instrument circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1281499B (de) * 1966-03-23 1968-10-31 Siemens Ag Schaltungsanordnung fuer sprachgesteuerte Freisprechgeraete mit veraenderbarem Daempfungshub
FR2210872A1 (fr) * 1972-12-18 1974-07-12 Ericsson Telefon Ab L M
FR2261669A1 (en) * 1974-02-14 1975-09-12 Girard J Philippe Telephone equipment self-energising protection device - can compensate the Larsen effect in lines with ear-piece
DE3218501A1 (de) * 1981-12-05 1983-11-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur gegensinnigen verstaerkungssteuerung
FR2527403A1 (fr) * 1982-05-21 1983-11-25 Mitel Corp Systeme et circuit de telephone a haut-parleur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544242A (en) * 1993-05-25 1996-08-06 Exar Corporation Speakerphone with event driven control circuit

Also Published As

Publication number Publication date
KR950014300B1 (ko) 1995-11-24
GB8717706D0 (en) 1987-09-03
KR880004713A (ko) 1988-06-07
JPH07112216B2 (ja) 1995-11-29
US4720856A (en) 1988-01-19
FR2603397B1 (fr) 1989-07-07
JPS6373759A (ja) 1988-04-04
GB2194694A (en) 1988-03-09
GB2194694B (en) 1991-01-02
HK26792A (en) 1992-04-16
SG20092G (en) 1992-04-16

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Legal Events

Date Code Title Description
D6 Patent endorsed licences of rights
ST Notification of lapse