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GB2017453A - An intercommunication line selection system - Google Patents

An intercommunication line selection system

Info

Publication number
GB2017453A
GB2017453A GB7908978A GB7908978A GB2017453A GB 2017453 A GB2017453 A GB 2017453A GB 7908978 A GB7908978 A GB 7908978A GB 7908978 A GB7908978 A GB 7908978A GB 2017453 A GB2017453 A GB 2017453A
Authority
GB
United Kingdom
Prior art keywords
call
audio
switched
called
receiving means
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.)
Granted
Application number
GB7908978A
Other versions
GB2017453B (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.)
NEUMANN ELEKTRONIK GmbH
Original Assignee
NEUMANN ELEKTRONIK GmbH
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 NEUMANN ELEKTRONIK GmbH filed Critical NEUMANN ELEKTRONIK GmbH
Publication of GB2017453A publication Critical patent/GB2017453A/en
Application granted granted Critical
Publication of GB2017453B publication Critical patent/GB2017453B/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
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Small-Scale Networks (AREA)

Abstract

In an intercommunication line selection system for voice communication comprising call stations eg 1 and a two-line (ring) circuit L, an interface 7 is provided between the call stations and the ring circuit. The interface 7 includes the following devices: a) Audio-frequency transmitters 8 for short-term transmission of call signals f1-fn-1, wherein each of these audio-frequency transmitters can be switched on by one of the call keys 4; b) A further audio-frequency transmitter 9 for transmitting a holding signal fo by which for the whole duration of the voice communication the call stations not being called are blocked and "engaged" signals are effected, which can be switched on by all the call keys; c) An audio-frequency receiver 11 for the call signal fn, by which the receiving means 2 of the call station are switched on; and d) An audio-frequency receiver 12 for the holding signal fo, by which on the one hand the receiving means of the call station being called are maintained switched on and on the other hand the receiving means of the call station not being called are blocked, via a gate 14 and a store 13. Lamps 5 and 6 indicate the call and engaged conditions respectively. <IMAGE>
GB7908978A 1978-03-23 1979-03-14 Intercommunication line selection system Expired GB2017453B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782812725 DE2812725B1 (en) 1978-03-23 1978-03-23 Device for connecting a call station for an intercom line dialing system to a loop

Publications (2)

Publication Number Publication Date
GB2017453A true GB2017453A (en) 1979-10-03
GB2017453B GB2017453B (en) 1982-03-17

Family

ID=6035274

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7908978A Expired GB2017453B (en) 1978-03-23 1979-03-14 Intercommunication line selection system

Country Status (4)

Country Link
CH (1) CH644483A5 (en)
DE (1) DE2812725B1 (en)
FR (1) FR2420887A1 (en)
GB (1) GB2017453B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946177C2 (en) * 1979-11-15 1988-08-18 S. Siedle & Söhne Telefon- und Telegrafenwerke GmbH, 7743 Furtwangen House system for the transmission of information

Also Published As

Publication number Publication date
FR2420887A1 (en) 1979-10-19
FR2420887B3 (en) 1982-01-22
DE2812725B1 (en) 1979-09-06
CH644483A5 (en) 1984-07-31
GB2017453B (en) 1982-03-17

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee