IL60945A - Circuits and methods for initializing the loop current of a telephone set - Google Patents

Circuits and methods for initializing the loop current of a telephone set

Info

Publication number
IL60945A
IL60945A IL60945A IL6094580A IL60945A IL 60945 A IL60945 A IL 60945A IL 60945 A IL60945 A IL 60945A IL 6094580 A IL6094580 A IL 6094580A IL 60945 A IL60945 A IL 60945A
Authority
IL
Israel
Prior art keywords
initializing
circuits
methods
telephone set
loop current
Prior art date
Application number
IL60945A
Other languages
English (en)
Other versions
IL60945A0 (en
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of IL60945A0 publication Critical patent/IL60945A0/xx
Publication of IL60945A publication Critical patent/IL60945A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H04M1/585—Anti-side-tone circuits implemented without inductive element
    • 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
    • H04M1/6025—Substation equipment, e.g. for use by subscribers including speech amplifiers implemented as integrated speech networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance
    • 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)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
  • Small-Scale Networks (AREA)
IL60945A 1979-09-04 1980-09-01 Circuits and methods for initializing the loop current of a telephone set IL60945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/072,252 US4268723A (en) 1979-09-04 1979-09-04 Circuits and methods for initializing the loop current of a telephone set

Publications (2)

Publication Number Publication Date
IL60945A0 IL60945A0 (en) 1980-11-30
IL60945A true IL60945A (en) 1983-06-15

Family

ID=22106473

Family Applications (1)

Application Number Title Priority Date Filing Date
IL60945A IL60945A (en) 1979-09-04 1980-09-01 Circuits and methods for initializing the loop current of a telephone set

Country Status (7)

Country Link
US (2) US4268723A (ja)
EP (2) EP0030228A3 (ja)
JP (1) JPS5646355A (ja)
CA (1) CA1154184A (ja)
DE (1) DE3069799D1 (ja)
ES (1) ES8105125A1 (ja)
IL (1) IL60945A (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064268B (en) * 1979-09-17 1983-10-26 Philips Nv Electronic signalling device for connection to a signal transmission line
GB2064915B (en) * 1979-11-29 1984-03-21 Standard Telephones Cables Ltd Telephone line feed circuit
GB2065418B (en) * 1979-12-06 1984-02-15 Standard Telephones Cables Ltd Telephone line feed
GB2066023B (en) * 1979-12-13 1983-11-09 Standard Telephones Cables Ltd Telephone line interface
DE3227399A1 (de) * 1982-07-22 1984-01-26 Reich Spezialmaschinen GmbH, 7440 Nürtingen Laufrad fuer bandsaegen
JPS5937758A (ja) * 1982-08-26 1984-03-01 Hitoshi Ito 増幅回路
CA1239718A (en) * 1985-10-11 1988-07-26 Trillium Telephone Systems Inc. Key telephone system
FR2616277B1 (fr) * 1987-06-05 1990-12-07 Thomson Semiconducteurs Circuit pour poste telephonique incorporant une protection contre les surcharges de tension
US5144252A (en) * 1990-11-27 1992-09-01 Harris Corporation Method and apparatus for transducer measurements on a metallic pair
WO1999053627A1 (en) 1998-04-10 1999-10-21 Chrimar Systems, Inc. Doing Business As Cms Technologies System for communicating with electronic equipment on a network
US6930506B2 (en) * 2002-10-22 2005-08-16 International Business Machines Corporation Terminating resistor driver for high speed data communication
CA2572625C (en) * 2004-07-09 2014-07-08 G & F Industries Boat pad and pad assembly
US7888968B2 (en) * 2009-01-15 2011-02-15 International Business Machines Corporation Configurable pre-emphasis driver with selective constant and adjustable output impedance modes

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2842623A (en) * 1954-06-11 1958-07-08 Dictograph Products Co Inc Transistor amplifier for telephone instrument
US3071647A (en) * 1959-01-07 1963-01-01 Sylvania Electric Prod Intercommunication system
GB944762A (en) * 1961-03-20 1963-12-18 Ass Elect Ind Improvements relating to self-regulating two-terminal impedance networks and their use in telephone system substation circuits
US3283074A (en) * 1962-12-31 1966-11-01 Gen Electric Voice-controlled communication system
US3588359A (en) * 1968-12-11 1971-06-28 Nasa Protective suit having an audio transceiver
CA930488A (en) * 1971-08-27 1973-07-17 Microsystems International Limited Power supply
GB1406243A (en) * 1971-10-28 1975-09-17 Gen Electric Co Ltd Loudspeaking telephone instruments
US3849603A (en) * 1972-10-30 1974-11-19 Mosler Safe Co Remote banking intercom system
US3860756A (en) * 1973-03-23 1975-01-14 Nitsuko Ltd Automatic voice-path switching circuit for a speaker phone telephone set
US3906167A (en) * 1973-07-17 1975-09-16 Thaddeous J Baker Constant current powered telephone circuits
CA1032221A (en) * 1974-06-14 1978-05-30 Mitel Canada Limited Telephone line impedance regulator
US3963876A (en) * 1975-06-30 1976-06-15 Bell Telephone Laboratories, Incorporated Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
US4049911A (en) * 1976-01-06 1977-09-20 Norcon Electronics Inc. Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude
JPS5356903A (en) * 1976-11-02 1978-05-23 Nippon Telegr & Teleph Corp <Ntt> Automatic level control circuit for telephone set
US4119797A (en) * 1977-06-29 1978-10-10 Technology Development Corporation Voice operated switch having an activation level which is higher than its sustaining level
DE2822067C2 (de) * 1978-05-20 1986-09-18 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für Fernsprechapparate

Also Published As

Publication number Publication date
ES494729A0 (es) 1981-06-01
US4282409A (en) 1981-08-04
IL60945A0 (en) 1980-11-30
ES8105125A1 (es) 1981-06-01
EP0024942A1 (en) 1981-03-11
DE3069799D1 (en) 1985-01-24
JPS5646355A (en) 1981-04-27
US4268723A (en) 1981-05-19
EP0030228A2 (en) 1981-06-10
CA1154184A (en) 1983-09-20
EP0030228A3 (en) 1981-12-30
EP0024942B1 (en) 1984-12-12

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Legal Events

Date Code Title Description
KB Patent renewed
EXP Patent expired