FR70935E - Perfectionnements aux appareils téléphoniques - Google Patents

Perfectionnements aux appareils téléphoniques

Info

Publication number
FR70935E
FR70935E FR70935DA FR70935E FR 70935 E FR70935 E FR 70935E FR 70935D A FR70935D A FR 70935DA FR 70935 E FR70935 E FR 70935E
Authority
FR
France
Prior art keywords
telephone devices
telephone
devices
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)
Inventor
Hugh Spence Leman
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of FR70935E publication Critical patent/FR70935E/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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
    • 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
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
FR70935D 1954-02-08 1957-01-03 Perfectionnements aux appareils téléphoniques Expired FR70935E (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB329937X 1954-02-08
GB2950351X 1956-01-04

Publications (1)

Publication Number Publication Date
FR70935E true FR70935E (fr) 1959-09-30

Family

ID=32396016

Family Applications (5)

Application Number Title Priority Date Filing Date
FR1119874D Expired FR1119874A (fr) 1954-02-08 1955-02-08 Perfectionnements aux appareils téléphoniques
FR69988D Expired FR69988E (fr) 1954-02-08 1956-05-04 Perfectionnements aux appareils téléphoniques
FR70935D Expired FR70935E (fr) 1954-02-08 1957-01-03 Perfectionnements aux appareils téléphoniques
FR72139D Expired FR72139E (fr) 1954-02-08 1957-07-31 Perfectionnements aux appareils téléphoniques
FR782138A Expired FR78554E (fr) 1954-02-08 1958-12-19 Perfectionnements aux appareils téléphoniques

Family Applications Before (2)

Application Number Title Priority Date Filing Date
FR1119874D Expired FR1119874A (fr) 1954-02-08 1955-02-08 Perfectionnements aux appareils téléphoniques
FR69988D Expired FR69988E (fr) 1954-02-08 1956-05-04 Perfectionnements aux appareils téléphoniques

Family Applications After (2)

Application Number Title Priority Date Filing Date
FR72139D Expired FR72139E (fr) 1954-02-08 1957-07-31 Perfectionnements aux appareils téléphoniques
FR782138A Expired FR78554E (fr) 1954-02-08 1958-12-19 Perfectionnements aux appareils téléphoniques

Country Status (6)

Country Link
US (2) US2838612A (fr)
BE (3) BE553926A (fr)
CH (2) CH329937A (fr)
DE (2) DE1031357B (fr)
FR (5) FR1119874A (fr)
GB (2) GB859111A (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1074088B (de) * 1960-01-28 Krone Kommanditgesellschaft, Berlin-Zehlendorf Fernsprechapparat mit einem Transistor-Sprechverstärker
BE535520A (fr) * 1954-02-08
CH369172A (de) * 1954-02-08 1963-05-15 Standard Telephon & Radio Ag Telephonteilnehmerstation
US3066195A (en) * 1958-09-15 1962-11-27 Gen Dynamics Corp Signal transmitting and receiving station
NL247967A (fr) * 1959-02-02
US3170043A (en) * 1961-09-29 1965-02-16 Bell Telephone Labor Inc Telephone anti-sidetone circuit
US3254160A (en) * 1962-12-27 1966-05-31 Gai Tronics Corp Regulated gain telephone handset receiver amplifier
US3250861A (en) * 1963-04-19 1966-05-10 Robert D Babylon Railroad way station telephone amplifier
US3462560A (en) * 1966-04-06 1969-08-19 Bell Telephone Labor Inc Subscriber telephone circuit with resistance hybrid sidetone balancing network
US3440367A (en) * 1966-05-06 1969-04-22 Bell Telephone Labor Inc Nonreactive antisidetone network for a telephone set
US3479468A (en) * 1967-03-10 1969-11-18 Bell Telephone Labor Inc Circuit for enabling simultaneous transmission in both directions on a two-wire line
US3529099A (en) * 1967-05-10 1970-09-15 Itt Telephone subset with resistive hybrid network
US3711660A (en) * 1969-12-04 1973-01-16 Univ Monash Hybrid networks
BE794023A (fr) * 1972-01-20 1973-05-02 Western Electric Co Amplificateur alimente par la ligne meme dans laquelle il debite
CH549914A (de) * 1972-03-10 1974-05-31 Zellweger Uster Ag Uebertragungseinrichtung mit einer gabelschaltung.
DE2840250C2 (de) * 1978-09-15 1983-01-20 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für eine leitungsgespeiste Lautfernsprechstation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1872347A (en) * 1929-03-30 1932-08-16 Rca Corp Amplifier tube control
NL40011C (fr) * 1932-04-30 1937-02-15
DE672791C (de) * 1932-07-23 1939-03-10 Werner Nestel Dipl Ing Verfahren zur Verminderung des Anodenstromverbrauches von Verstaerkern
GB679875A (en) * 1949-03-16 1952-09-24 Siemens Ag Improvements in or relating to an arrangement for telephone subscribers sets
US2858371A (en) * 1953-07-01 1958-10-28 Gen Electric Co Ltd Telephone subscribers' apparatus
BE535520A (fr) * 1954-02-08
BE543085A (fr) * 1954-12-30

Also Published As

Publication number Publication date
FR72139E (fr) 1960-03-30
CH329937A (de) 1958-05-15
US2838612A (en) 1958-06-10
FR69988E (fr) 1959-01-30
US2950351A (en) 1960-08-23
BE535520A (fr)
DE1031357B (de) 1958-06-04
GB865012A (en) 1961-04-12
GB859111A (en) 1961-01-18
FR78554E (fr) 1962-08-10
CH354121A (de) 1961-05-15
DE1134119B (de) 1962-08-02
BE553926A (fr)
FR1119874A (fr) 1956-06-26
BE560458A (fr)

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