GB449609A - Loud-speaking and amplified telephone systems - Google Patents

Loud-speaking and amplified telephone systems

Info

Publication number
GB449609A
GB449609A GB36952/34A GB3695234A GB449609A GB 449609 A GB449609 A GB 449609A GB 36952/34 A GB36952/34 A GB 36952/34A GB 3695234 A GB3695234 A GB 3695234A GB 449609 A GB449609 A GB 449609A
Authority
GB
United Kingdom
Prior art keywords
relay
operates
key
loud
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
GB36952/34A
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.)
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
Publication of GB449609A publication Critical patent/GB449609A/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)
GB36952/34A 1933-12-30 1934-12-24 Loud-speaking and amplified telephone systems Expired GB449609A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB449609A true GB449609A (en) 1936-06-24

Family

ID=8900758

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36952/34A Expired GB449609A (en) 1933-12-30 1934-12-24 Loud-speaking and amplified telephone systems

Country Status (4)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956693C (de) * 1953-03-19 1957-01-24 Telefunken Gmbh Schaltungsanordnung fuer Gegensprechanlagen
DE958935C (de) * 1954-02-08 1957-02-28 Telefunken Gmbh Schaltungsanordnung fuer sprachgesteuerte Echo- und Rueckkopplungssperren in Gegensprechanlagen mit Lautsprecherbetrieb
DE1019706B (de) * 1954-12-14 1957-11-21 Svenska Relaefab Ab Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der UEbertragungsrichtung
DE1020371B (de) * 1952-10-15 1957-12-05 Svenska Relaefab Ab Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der Verkehrsrichtung
DE972766C (de) * 1941-12-14 1959-09-24 Normalzeit G M B H Sprechanlage mit mehreren Stationen und zentralem Verstaerker

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH258989A (de) * 1942-12-04 1948-12-31 Autophon Ag Anordnung zum Umschalten der Sprechrichtung in Wechselsprechanlagen für lautstarken Verkehr.
CH258725A (de) * 1942-12-21 1948-12-15 Autophon Ag Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr.
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 (de) * 1944-10-21 1947-08-31 Autophon Ag Anordnung in einer Wechselsprechanlage für lautstarken Verkehr.
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
US2819340A (en) * 1953-11-17 1958-01-07 Stanley S Brody Voice operated intercommunication system
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972766C (de) * 1941-12-14 1959-09-24 Normalzeit G M B H Sprechanlage mit mehreren Stationen und zentralem Verstaerker
DE1020371B (de) * 1952-10-15 1957-12-05 Svenska Relaefab Ab Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der Verkehrsrichtung
DE956693C (de) * 1953-03-19 1957-01-24 Telefunken Gmbh Schaltungsanordnung fuer Gegensprechanlagen
DE958935C (de) * 1954-02-08 1957-02-28 Telefunken Gmbh Schaltungsanordnung fuer sprachgesteuerte Echo- und Rueckkopplungssperren in Gegensprechanlagen mit Lautsprecherbetrieb
DE1019706B (de) * 1954-12-14 1957-11-21 Svenska Relaefab Ab Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der UEbertragungsrichtung

Also Published As

Publication number Publication date
BE407035A (enrdf_load_stackoverflow) 1935-01-30
US2102903A (en) 1937-12-21
FR46765E (fr) 1936-09-11
FR789510A (fr) 1935-10-30

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