GB647765A - Improvements in and relating to intercommunication systems - Google Patents

Improvements in and relating to intercommunication systems

Info

Publication number
GB647765A
GB647765A GB36607/46A GB3660746A GB647765A GB 647765 A GB647765 A GB 647765A GB 36607/46 A GB36607/46 A GB 36607/46A GB 3660746 A GB3660746 A GB 3660746A GB 647765 A GB647765 A GB 647765A
Authority
GB
United Kingdom
Prior art keywords
calling
station
amplifier
key
stations
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
GB36607/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB647765A publication Critical patent/GB647765A/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

647,765. Intercommunication systems. LEGERTH, K. I. B. Dec. 11, 1946, No. 36607. Convention date, Jan. 24. Drawings to Specification. [Class 40 (iv)] In an intercommunication system having at least four stations each provided with a loudspeaker serving as both transmitter and receiver and with a key for calling each of the other stations, calls are set up over a number of link circuits less than the number of stations, each of which comprises an amplifier and a group of relays. A common allotter is taken into use by the operation of the start key of a calling station and operates the relay group of a selected idle link circuit to connect the loudspeaker of the calling station to the output side of the amplifier. Depression of the calling key corresponding to the wanted station then operates the relay group to connect the loudspeaker of the wanted station to the input side of the amplifier. Re-operation of the start key controls the changing-over of the connections to the amplifier to permit the calling party to speak. Release is under the control of the calling party and is initiated by operation of the station's restore key. Two-way amplifiers may be used and directional switching is then not required.
GB36607/46A 1946-01-24 1946-12-11 Improvements in and relating to intercommunication systems Expired GB647765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE263429X 1946-01-24

Publications (1)

Publication Number Publication Date
GB647765A true GB647765A (en) 1950-12-20

Family

ID=20306518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36607/46A Expired GB647765A (en) 1946-01-24 1946-12-11 Improvements in and relating to intercommunication systems

Country Status (4)

Country Link
US (1) US2512834A (en)
CH (1) CH263429A (en)
DE (1) DE846563C (en)
GB (1) GB647765A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744966A (en) * 1950-10-05 1956-05-08 Executone Inf Sys Inc Intercommunication system
US2741667A (en) * 1953-02-11 1956-04-10 Commercial Radio Sound Corp Privacy guarded telephone intercommunicating system
US3130272A (en) * 1958-10-17 1964-04-21 Talk A Phone Co Intercommunication system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1356256A (en) * 1918-08-19 1920-10-19 Western Electric Co Telephone system
US1647606A (en) * 1925-11-28 1927-11-01 J S Timmons Inc Intercommunication system
US2036023A (en) * 1933-06-09 1936-03-31 Bell Telephone Labor Inc Telephone system
US2054933A (en) * 1934-01-08 1936-09-22 John A Frazier Return speech control
US2110358A (en) * 1936-06-06 1938-03-08 Electro Acoustic Products Comp System for sound reproducing apparatus
US2200814A (en) * 1936-08-31 1940-05-14 Siemens Ag Telephone system
US2269143A (en) * 1940-06-28 1942-01-06 Webster Electric Co Inc Communication system
US2269142A (en) * 1940-06-28 1942-01-06 Webster Electric Co Inc Communication system
US2347080A (en) * 1942-12-14 1944-04-18 Webster Electric Co Inc Communication system

Also Published As

Publication number Publication date
US2512834A (en) 1950-06-27
DE846563C (en) 1952-08-14
CH263429A (en) 1949-08-31

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