FR970278A - Perfectionnements aux postes téléphoniques d'abonnés - Google Patents

Perfectionnements aux postes téléphoniques d'abonnés

Info

Publication number
FR970278A
FR970278A FR970278DA FR970278A FR 970278 A FR970278 A FR 970278A FR 970278D A FR970278D A FR 970278DA FR 970278 A FR970278 A FR 970278A
Authority
FR
France
Prior art keywords
subscriber telephones
telephones
subscriber
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
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.)
AT&T Corp
Original Assignee
Western Electric Co 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of FR970278A publication Critical patent/FR970278A/fr
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
    • H04M1/738—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
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
FR970278D 1947-12-22 1948-08-10 Perfectionnements aux postes téléphoniques d'abonnés Expired FR970278A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US793170A US2620402A (en) 1947-12-22 1947-12-22 Telephone substation circuit with automatic compensation for length of line

Publications (1)

Publication Number Publication Date
FR970278A true FR970278A (fr) 1951-01-02

Family

ID=25159263

Family Applications (1)

Application Number Title Priority Date Filing Date
FR970278D Expired FR970278A (fr) 1947-12-22 1948-08-10 Perfectionnements aux postes téléphoniques d'abonnés

Country Status (5)

Country Link
US (2) US2620402A (fr)
BE (1) BE485032A (fr)
CH (1) CH276285A (fr)
FR (1) FR970278A (fr)
GB (1) GB661037A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1096424B (de) * 1956-03-29 1961-01-05 Western Electric Co Schaltungsanordnung fuer Fernsprechteilnehmerstationen mit einem aus der Amtsbatterie gespeisten Transistorverstaerker

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510745A (fr) * 1951-04-18
DE1060915B (de) * 1953-12-21 1959-07-09 Deutsche Bundespost Schutzanordnung fuer Kontakte oder kontaktaehnliche Gebilde in Nachrichtenuebertragungsanlagen gegen hohe Spannungs- und Stromstoesse
DE1069213B (fr) * 1955-09-17 1959-11-19
DE1002399B (de) * 1955-12-30 1957-02-14 Siemens Ag Schaltungsanordnung zur selbsttaetigen Regelung der Rueckhoerdaempfung von Fernsprechstationen
US3020351A (en) * 1957-03-20 1962-02-06 Gen Dynamics Corp Directional coupling network
NL269763A (fr) * 1960-09-30
US3210473A (en) * 1962-12-20 1965-10-05 Automatic Elect Lab Trunk circuit pad-control arrangements
US4132863A (en) * 1977-12-20 1979-01-02 Bell Telephone Laboratories, Incorporated Automatic gain and return loss compensating line circuit
US5471527A (en) * 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US901738A (en) * 1905-07-31 1908-10-20 Kellogg Switchboard & Supply Subscriber's telephone-circuit.
US1399775A (en) * 1918-02-01 1921-12-13 Western Electric Co Common-battery substation
US1442427A (en) * 1919-08-06 1923-01-16 Western Electric Co Anti-side-tone substation circuit
US1464118A (en) * 1919-11-28 1923-08-07 Western Electric Co Machine-switching telephone-exchange system
US1555037A (en) * 1921-10-04 1925-09-29 American Telephone & Telegraph Resistance amplifier
GB178860A (en) * 1922-05-03 1923-07-23 Drahtlose Telegraphie Gmbh Improvements in telephone systems
US1641233A (en) * 1923-10-20 1927-09-06 Stromberg Carlson Telephone Telephone system
US1993780A (en) * 1931-02-11 1935-03-12 Bell Telephone Labor Inc Telephone substation equipment
US2164033A (en) * 1938-01-08 1939-06-27 Bell Telephone Labor Inc Telephone system
US2202386A (en) * 1939-02-24 1940-05-28 Bell Telephone Labor Inc Telephone circuit
US2288049A (en) * 1939-06-10 1942-06-30 Bell Telephone Labor Inc Telephone set circuit
US2287998A (en) * 1939-06-10 1942-06-30 Bell Telephone Labor Inc Telephone circuit
US2260296A (en) * 1939-09-29 1941-10-28 Bell Telephone Labor Inc Electrical filter
US2277623A (en) * 1939-10-12 1942-03-24 Bell Telephone Labor Inc Telephone system
US2360233A (en) * 1941-12-10 1944-10-10 Bell Telephone Labor Inc Thermistor as amplifier for low frequency signals
US2431306A (en) * 1942-07-09 1947-11-25 Int Standard Electric Corp Thermionic amplifier
NL64921C (fr) * 1942-10-24
US2375791A (en) * 1943-03-09 1945-05-15 Bell Telephone Labor Inc Telephone station circuit
US2548723A (en) * 1945-07-13 1951-04-10 Kellogg Switchboard & Supply Telephone set hook-switch apparatus
BE483204A (fr) * 1947-11-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1096424B (de) * 1956-03-29 1961-01-05 Western Electric Co Schaltungsanordnung fuer Fernsprechteilnehmerstationen mit einem aus der Amtsbatterie gespeisten Transistorverstaerker

Also Published As

Publication number Publication date
CH276285A (de) 1951-06-30
GB661037A (en) 1951-11-14
US2620402A (en) 1952-12-02
BE485032A (fr)
US2732436A (en) 1956-01-24

Similar Documents

Publication Publication Date Title
FR966204A (fr) Perfectionnements aux raccordements
FR970278A (fr) Perfectionnements aux postes téléphoniques d'abonnés
FR941246A (fr) Perfectionnements aux postes téléphoniques
FR1023959A (fr) Perfectionnements aux centraux téléphoniques automatiques
FR948756A (fr) Perfectionnements apportés aux pistolets d'abatage
FR967251A (fr) Perfectionnements aux compositions résineuses
FR1004182A (fr) Perfectionnements aux chenêts
FR944751A (fr) Perfectionnements aux broyeurs-homogénéiseurs
FR970674A (fr) Perfectionnements aux pompes
FR1048760A (fr) Perfectionnements aux postes d'abonnés
FR999533A (fr) Poste téléphonique d'abonné
FR951898A (fr) Téléphone miniature
FR967431A (fr) Perfectionnements aux turbo-réacteurs
CH271526A (de) Telephonapparat.
FR941525A (fr) Perfectionnements aux tables d'opération
FR71354E (fr) Perfectionnements aux cadrans d'appel téléphoniques
FR939754A (fr) Perfectionnements aux installations téléphoniques
FR974412A (fr) Perfectionnements aux têtes d'étirage
FR947703A (fr) Perfectionnements aux carburateurs
FR967064A (fr) Perfectionnements relatifs aux compositions résineuses
CH312795A (de) Interurbane Fernmeldeamtsanlage
CH271784A (de) Telephonapparat.
FR942354A (fr) Perfectionnements aux pompes
FR945699A (fr) Perfectionnements aux cloches d'électrolyse
FR948889A (fr) Perfectionnements aux grues