Nothing Special   »   [go: up one dir, main page]

FR2417889A1 - Telephone electroacoustic transducer modulator amplifier - has symmetrical transistor bridge and maintains total constant current - Google Patents

Telephone electroacoustic transducer modulator amplifier - has symmetrical transistor bridge and maintains total constant current

Info

Publication number
FR2417889A1
FR2417889A1 FR7904360A FR7904360A FR2417889A1 FR 2417889 A1 FR2417889 A1 FR 2417889A1 FR 7904360 A FR7904360 A FR 7904360A FR 7904360 A FR7904360 A FR 7904360A FR 2417889 A1 FR2417889 A1 FR 2417889A1
Authority
FR
France
Prior art keywords
telephone
constant current
electroacoustic transducer
transistor bridge
bridge
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.)
Withdrawn
Application number
FR7904360A
Other languages
French (fr)
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of FR2417889A1 publication Critical patent/FR2417889A1/en
Withdrawn legal-status Critical Current

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
    • H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

The amplifier consists of a symmetric bridge and is intended for modulating an electroacoustic, electromagtic, electrodynamic transducer (1) in a subscriber's telephone set. The bridge has four linear components and a device (8) to maintain the total current passing into the amplifier constant. The bridge's components comprise transistors (21, 31, 41, 51) connected to pilot circuits (22-25, 42-45). These circuits contain current inverters (22, 23, 42, 43).
FR7904360A 1978-02-21 1979-02-21 Telephone electroacoustic transducer modulator amplifier - has symmetrical transistor bridge and maintains total constant current Withdrawn FR2417889A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2807304A DE2807304C2 (en) 1978-02-21 1978-02-21 Circuit arrangement for amplifying a signal generated in a terminal of a telecommunications system that is fed from a subscriber line

Publications (1)

Publication Number Publication Date
FR2417889A1 true FR2417889A1 (en) 1979-09-14

Family

ID=6032506

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7904360A Withdrawn FR2417889A1 (en) 1978-02-21 1979-02-21 Telephone electroacoustic transducer modulator amplifier - has symmetrical transistor bridge and maintains total constant current

Country Status (7)

Country Link
AT (1) ATA131379A (en)
AU (1) AU526550B2 (en)
BE (1) BE874270A (en)
DE (1) DE2807304C2 (en)
FR (1) FR2417889A1 (en)
IT (1) IT1111510B (en)
NL (1) NL7901324A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2512299A1 (en) * 1981-08-26 1983-03-04 Ates Componenti Elettron FINAL STAGE ON BRIDGE FOR A LOW FREQUENCY AMPLIFIER IN RECEPTION

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE417048B (en) * 1979-05-04 1981-02-16 Ericsson Telefon Ab L M BALANCED AMPLIFIER OUTPUT STEP
IL63653A (en) * 1980-08-29 1984-05-31 Western Electric Co Line powered transformer-less loudspeaking telephone

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136004A (en) * 1965-05-24 1968-12-11 Int Standard Electric Corp Signal translating circuit
GB1142824A (en) * 1967-06-21 1969-02-12 Mullard Ltd Amplifier circuits
DE1762319A1 (en) * 1968-05-24 1970-05-06 Telefunken Patent Transformerless power amplifier in a bridge circuit, especially for audio frequencies
US3582802A (en) * 1969-07-16 1971-06-01 Beckman Instruments Inc Direct coupled differential transistor amplifier with improved common mode performance
US3742377A (en) * 1971-07-08 1973-06-26 Nat Semiconductor Corp Differential amplifier with means for balancing out offset terms
US3947778A (en) * 1974-09-11 1976-03-30 Motorola, Inc. Differential amplifier
US4071713A (en) * 1976-12-27 1978-01-31 Northern Telecom Limited Telephone speech network

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136004A (en) * 1965-05-24 1968-12-11 Int Standard Electric Corp Signal translating circuit
GB1142824A (en) * 1967-06-21 1969-02-12 Mullard Ltd Amplifier circuits
DE1762319A1 (en) * 1968-05-24 1970-05-06 Telefunken Patent Transformerless power amplifier in a bridge circuit, especially for audio frequencies
US3582802A (en) * 1969-07-16 1971-06-01 Beckman Instruments Inc Direct coupled differential transistor amplifier with improved common mode performance
US3742377A (en) * 1971-07-08 1973-06-26 Nat Semiconductor Corp Differential amplifier with means for balancing out offset terms
US3947778A (en) * 1974-09-11 1976-03-30 Motorola, Inc. Differential amplifier
US4071713A (en) * 1976-12-27 1978-01-31 Northern Telecom Limited Telephone speech network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/77 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2512299A1 (en) * 1981-08-26 1983-03-04 Ates Componenti Elettron FINAL STAGE ON BRIDGE FOR A LOW FREQUENCY AMPLIFIER IN RECEPTION

Also Published As

Publication number Publication date
IT1111510B (en) 1986-01-13
NL7901324A (en) 1979-08-23
AU526550B2 (en) 1983-01-20
DE2807304C2 (en) 1982-07-01
DE2807304A1 (en) 1979-08-23
AU4439879A (en) 1979-08-30
ATA131379A (en) 1982-12-15
BE874270A (en) 1979-06-18
IT7920311A0 (en) 1979-02-19

Similar Documents

Publication Publication Date Title
ES2063123T3 (en) METHOD AND APPARATUS FOR THE BROADBAND TRANSMISSION OF DIGITAL SIGNALS BETWEEN, FOR EXAMPLE, A TELEPHONE CENTER AND SUBSCRIBER ADDRESSES.
EP0119422A3 (en) Inductance simulation circuit
SE8001848L (en) AIDS TO CURE OR REDUCE STAMBING
FR2417889A1 (en) Telephone electroacoustic transducer modulator amplifier - has symmetrical transistor bridge and maintains total constant current
PT83829A (en) FONTAINE D: ENERGY FOR TELEPHONE
SE7713728L (en) DEVICE FOR ELECTRONIC POWER SUPPLY FOR SUBSCRIBER DEVICES
SE8003399L (en) MANAGEMENT CIRCUIT
SE8205342D0 (en) METHOD AND DEVICE FOR POWER SUPPLY OF A SUBSCRIBER DEVICE FROM A TELEPHONE SWITCH
JPS52139302A (en) Automatic circuit switching unit
FR2372545A1 (en) FIELD-EFFECT TRANSISTOR AMPLIFIER
TW431067B (en) Single source differential circuit
SE7902832L (en) SUBSCRIBER CIRCUIT INCLUDING A SYMMETRIC POWER AMPLIFIER FOR SUPPLYING A SUBSCRIBER MANAGEMENT
ES476608A1 (en) Bridge amplifier
ES464223A1 (en) Subscriber{3 s line equipment for a telephone exchange
EP0346020A3 (en) Drive amplifier circuit
ATE4T1 (en) CIRCUIT ARRANGEMENT FOR EARTH-FREE TRANSMISSION OF SIGNALS VIA SEPARATION POINTS IN TELECOMMUNICATION SYSTEMS
ES8600591A1 (en) Improvements in or relating to telephone circuits, monolithically integrated, for ring trip detection.
FR2442557A1 (en) Automatic telephone line asymmetrical signal balancing - using synthetic centre tap on power supply and regulation of supply transistors
GB1531692A (en) Telecommunication substation
JPS5360522A (en) Voice answering system
SE8006004L (en) ELECTRONIC TELEPHONE CIRCUIT
JPS53138261A (en) Integrated circuit device
JPS56114439A (en) Invertor circuit
JPS57164647A (en) Parallel operation for telephone device on digital loop
JPS5456348A (en) Modulator

Legal Events

Date Code Title Description
RE Withdrawal of published application