AT315923B - Circuit arrangement for subscriber stations with keypad for generating tone-frequency characters in telecommunication systems, in particular telephone systems - Google Patents

Circuit arrangement for subscriber stations with keypad for generating tone-frequency characters in telecommunication systems, in particular telephone systems

Info

Publication number
AT315923B
AT315923B AT974971A AT974971A AT315923B AT 315923 B AT315923 B AT 315923B AT 974971 A AT974971 A AT 974971A AT 974971 A AT974971 A AT 974971A AT 315923 B AT315923 B AT 315923B
Authority
AT
Austria
Prior art keywords
systems
keypad
circuit arrangement
subscriber stations
particular telephone
Prior art date
Application number
AT974971A
Other languages
German (de)
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
Application granted granted Critical
Publication of AT315923B publication Critical patent/AT315923B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Devices For Supply Of Signal Current (AREA)
AT974971A 1970-12-05 1971-11-11 Circuit arrangement for subscriber stations with keypad for generating tone-frequency characters in telecommunication systems, in particular telephone systems AT315923B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702059950 DE2059950B2 (en) 1970-12-05 1970-12-05 Circuit arrangement for subscriber stations in telecommunications, in particular telephone systems with additional data traffic

Publications (1)

Publication Number Publication Date
AT315923B true AT315923B (en) 1974-06-25

Family

ID=5790108

Family Applications (1)

Application Number Title Priority Date Filing Date
AT974971A AT315923B (en) 1970-12-05 1971-11-11 Circuit arrangement for subscriber stations with keypad for generating tone-frequency characters in telecommunication systems, in particular telephone systems

Country Status (11)

Country Link
JP (1) JPS5416166B1 (en)
AT (1) AT315923B (en)
BE (1) BE776231A (en)
CH (1) CH538793A (en)
DE (1) DE2059950B2 (en)
FR (1) FR2117203A5 (en)
GB (1) GB1356699A (en)
IT (1) IT943714B (en)
LU (1) LU64400A1 (en)
NL (1) NL160134C (en)
SE (1) SE364577B (en)

Also Published As

Publication number Publication date
LU64400A1 (en) 1972-06-19
SE364577B (en) 1974-02-25
DE2059950A1 (en) 1972-06-15
IT943714B (en) 1973-04-10
BE776231A (en) 1972-06-05
NL160134B (en) 1979-04-17
JPS5416166B1 (en) 1979-06-20
NL160134C (en) 1979-09-17
DE2059950B2 (en) 1974-04-18
FR2117203A5 (en) 1972-07-21
GB1356699A (en) 1974-06-12
NL7116592A (en) 1972-06-07
CH538793A (en) 1973-06-30

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Legal Events

Date Code Title Description
ELJ Ceased due to non-payment of the annual fee