GB1334163A - Telephone circuits utilizing active elements - Google Patents

Telephone circuits utilizing active elements

Info

Publication number
GB1334163A
GB1334163A GB2105371A GB2105371A GB1334163A GB 1334163 A GB1334163 A GB 1334163A GB 2105371 A GB2105371 A GB 2105371A GB 2105371 A GB2105371 A GB 2105371A GB 1334163 A GB1334163 A GB 1334163A
Authority
GB
United Kingdom
Prior art keywords
transistor
transmitter
receiver
terminal
circuit
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.)
Expired
Application number
GB2105371A
Other languages
English (en)
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB1334163A publication Critical patent/GB1334163A/en
Expired 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
    • H04M1/58—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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
GB2105371A 1970-02-07 1971-04-19 Telephone circuits utilizing active elements Expired GB1334163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45010509A JPS495645B1 (US07922777-20110412-C00004.png) 1970-02-07 1970-02-07

Publications (1)

Publication Number Publication Date
GB1334163A true GB1334163A (en) 1973-10-17

Family

ID=11752170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2105371A Expired GB1334163A (en) 1970-02-07 1971-04-19 Telephone circuits utilizing active elements

Country Status (6)

Country Link
US (1) US3708630A (US07922777-20110412-C00004.png)
JP (1) JPS495645B1 (US07922777-20110412-C00004.png)
CA (1) CA931290A (US07922777-20110412-C00004.png)
DE (1) DE2105532C3 (US07922777-20110412-C00004.png)
GB (1) GB1334163A (US07922777-20110412-C00004.png)
SE (1) SE357291B (US07922777-20110412-C00004.png)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899646A (en) * 1974-05-28 1975-08-12 Bell Telephone Labor Inc Telephone set speech network
GB1546046A (en) * 1976-12-03 1979-05-16 Cselt Centro Studi Lab Telecom Transmitting and receiving circuit for subscriber telephone sets
JPS5831122B2 (ja) * 1979-01-19 1983-07-04 仁 伊藤 混合回路
JPS596549B2 (ja) * 1979-07-03 1984-02-13 日本電信電話株式会社 電話機用３端子電源回路
FR2478412A1 (fr) * 1980-03-14 1981-09-18 Radiotechnique Compelec Procede pour adapter automatiquement des circuits electroniques de postes telephoniques a la resistance de la ligne, et poste comportant des circuits auto-adaptes
IL63653A (en) * 1980-08-29 1984-05-31 Western Electric Co Line powered transformer-less loudspeaking telephone
FR2526252B1 (fr) * 1982-05-03 1986-12-19 Constr Telephoniques Circuit de commande du courant d'une ligne de transmission
FR2538648A1 (fr) * 1982-12-28 1984-06-29 Thomson Csf Circuit de suppression de signal de microphone pour poste telephonique
US4885563A (en) * 1988-05-03 1989-12-05 Thermo King Corporation Power line carrier communication system
US5172410A (en) * 1990-04-26 1992-12-15 Sound Control Technologies, Inc. Conference telephone system and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645681A (en) * 1950-04-11 1953-07-14 Bell Telephone Labor Inc Telephone equalizer circuit
GB1164931A (en) * 1967-01-04 1969-09-24 Standard Telephones Cables Ltd Automatic Regulation of Telephone Sets.
US3546395A (en) * 1968-01-15 1970-12-08 Bell Telephone Labor Inc Active telephone set speech network employing transistor feedback loop for sidetone balance and equalization
SE334921B (US07922777-20110412-C00004.png) * 1968-01-18 1971-05-10 O Sternbeck
DE1762804B2 (de) * 1968-08-29 1972-01-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur regelung der sende und empfangsbezugs daempfung einer teilnehmerstation einer fernsprechanlage

Also Published As

Publication number Publication date
SE357291B (US07922777-20110412-C00004.png) 1973-06-18
DE2105532B2 (de) 1973-09-27
JPS495645B1 (US07922777-20110412-C00004.png) 1974-02-08
DE2105532C3 (de) 1974-04-18
DE2105532A1 (de) 1971-08-26
US3708630A (en) 1973-01-02
CA931290A (en) 1973-07-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years