FR789510A - Improvements in telephony - Google Patents

Improvements in telephony

Info

Publication number
FR789510A
FR789510A FR789510DA FR789510A FR 789510 A FR789510 A FR 789510A FR 789510D A FR789510D A FR 789510DA FR 789510 A FR789510 A FR 789510A
Authority
FR
France
Prior art keywords
telephony
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
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.)
LE TELEPHONE PRIVE NAT
Original Assignee
LE TELEPHONE PRIVE NAT
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 LE TELEPHONE PRIVE NAT filed Critical LE TELEPHONE PRIVE NAT
Application granted granted Critical
Publication of FR789510A publication Critical patent/FR789510A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
FR789510D 1933-12-30 1934-08-03 Improvements in telephony Expired FR789510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR449609X 1933-12-30

Publications (1)

Publication Number Publication Date
FR789510A true FR789510A (en) 1935-10-30

Family

ID=8900758

Family Applications (2)

Application Number Title Priority Date Filing Date
FR789510D Expired FR789510A (en) 1933-12-30 1934-08-03 Improvements in telephony
FR46765D Expired FR46765E (en) 1933-12-30 1935-04-17 Improvements in telephony

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR46765D Expired FR46765E (en) 1933-12-30 1935-04-17 Improvements in telephony

Country Status (4)

Country Link
US (1) US2102903A (en)
BE (1) BE407035A (en)
FR (2) FR789510A (en)
GB (1) GB449609A (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972766C (en) * 1941-12-14 1959-09-24 Normalzeit G M B H Intercom with several stations and a central amplifier
CH258989A (en) * 1942-12-04 1948-12-31 Autophon Ag Arrangement for switching the speech direction in intercom systems for noisy traffic.
CH258725A (en) * 1942-12-21 1948-12-15 Autophon Ag Remote switchable self-connection telephone for noisy traffic.
US2477275A (en) * 1944-01-15 1949-07-26 Firm Autophon Ag Voice-controlled two-way communication system
US2427983A (en) * 1944-03-09 1947-09-23 Autophon Ag Switching arrangement in duplex loud speaking systems
CH250532A (en) * 1944-10-21 1947-08-31 Autophon Ag Arrangement in an intercom for noisy traffic.
US2451339A (en) * 1945-02-08 1948-10-12 Automatic Elect Lab Intercommunicating system
US2427850A (en) * 1945-03-17 1947-09-23 Rca Corp Switching method and system
US2584790A (en) * 1945-12-18 1952-02-05 Rca Corp Switching circuit
US2694749A (en) * 1950-04-18 1954-11-16 Sepco 45 B D Sebastopol Communication system
DE1020371B (en) * 1952-10-15 1957-12-05 Svenska Relaefab Ab Intercom system with alternatively controlled by the speech stream or manually controlled switching of the traffic direction
DE956693C (en) * 1953-03-19 1957-01-24 Telefunken Gmbh Circuit arrangement for intercom systems
US2819340A (en) * 1953-11-17 1958-01-07 Stanley S Brody Voice operated intercommunication system
DE958935C (en) * 1954-02-08 1957-02-28 Telefunken Gmbh Circuit arrangement for voice-controlled echo and feedback barriers in intercom systems with loudspeaker operation
DE1019706B (en) * 1954-12-14 1957-11-21 Svenska Relaefab Ab Intercom system with either the voice stream or manually controlled switching of the transmission direction
US3023273A (en) * 1957-09-25 1962-02-27 Liberman Arie Communication system
US3439121A (en) * 1965-09-30 1969-04-15 Bell Telephone Labor Inc Multiple channel loud-speaking telephone

Also Published As

Publication number Publication date
GB449609A (en) 1936-06-24
FR46765E (en) 1936-09-11
BE407035A (en) 1935-01-30
US2102903A (en) 1937-12-21

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