CH331074A - Circuit arrangement for keyboard selection in telecommunication systems, in particular telephone systems - Google Patents

Circuit arrangement for keyboard selection in telecommunication systems, in particular telephone systems

Info

Publication number
CH331074A
CH331074A CH331074DA CH331074A CH 331074 A CH331074 A CH 331074A CH 331074D A CH331074D A CH 331074DA CH 331074 A CH331074 A CH 331074A
Authority
CH
Switzerland
Prior art keywords
systems
circuit arrangement
particular telephone
keyboard selection
telecommunication
Prior art date
Application number
Other languages
German (de)
Inventor
Peter Dipl Ing Gerke
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Publication of CH331074A publication Critical patent/CH331074A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
CH331074D 1954-04-05 1955-03-04 Circuit arrangement for keyboard selection in telecommunication systems, in particular telephone systems CH331074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE331074X 1954-04-05

Publications (1)

Publication Number Publication Date
CH331074A true CH331074A (en) 1958-06-30

Family

ID=6194540

Family Applications (1)

Application Number Title Priority Date Filing Date
CH331074D CH331074A (en) 1954-04-05 1955-03-04 Circuit arrangement for keyboard selection in telecommunication systems, in particular telephone systems

Country Status (4)

Country Link
BE (1) BE536547A (en)
CH (1) CH331074A (en)
FR (1) FR1137279A (en)
GB (1) GB783637A (en)

Also Published As

Publication number Publication date
FR1137279A (en) 1957-05-27
BE536547A (en)
GB783637A (en) 1957-09-25

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