CH392630A - Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency - Google Patents

Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency

Info

Publication number
CH392630A
CH392630A CH206762A CH206762A CH392630A CH 392630 A CH392630 A CH 392630A CH 206762 A CH206762 A CH 206762A CH 206762 A CH206762 A CH 206762A CH 392630 A CH392630 A CH 392630A
Authority
CH
Switzerland
Prior art keywords
audio frequency
circuit arrangement
selection criteria
subscriber stations
telephone subscriber
Prior art date
Application number
CH206762A
Other languages
German (de)
Inventor
Streit Rudolf Dipl-El-Ing
Original Assignee
Autophon 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 Autophon Ag filed Critical Autophon Ag
Priority to CH206762A priority Critical patent/CH392630A/en
Priority to CH1426262A priority patent/CH418409A/en
Priority to DEA42365A priority patent/DE1172737B/en
Publication of CH392630A publication Critical patent/CH392630A/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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
CH206762A 1962-02-20 1962-02-20 Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency CH392630A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH206762A CH392630A (en) 1962-02-20 1962-02-20 Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency
CH1426262A CH418409A (en) 1962-02-20 1962-12-05 Circuit arrangement for telephone subscriber stations with means for generating selection criteria each containing at least one audio frequency and with a microphone amplifier
DEA42365A DE1172737B (en) 1962-02-20 1963-02-18 Circuit arrangement for subscriber stations each connected to a subscriber line, fed with direct current via this feed line and having selection buttons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH206762A CH392630A (en) 1962-02-20 1962-02-20 Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency

Publications (1)

Publication Number Publication Date
CH392630A true CH392630A (en) 1965-05-31

Family

ID=4225115

Family Applications (1)

Application Number Title Priority Date Filing Date
CH206762A CH392630A (en) 1962-02-20 1962-02-20 Circuit arrangement for telephone subscriber stations for generating selection criteria each containing at least one audio frequency

Country Status (2)

Country Link
CH (1) CH392630A (en)
DE (1) DE1172737B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201417B (en) * 1964-07-10 1965-09-23 Standard Elektrik Lorenz Ag Tone-frequency touch-tone dialing method without direct current dialing characters in telecommunications, in particular telephone systems and circuitry for carrying out the method
CA792305A (en) * 1964-12-03 1968-08-13 N.V. Philips Gloeilampenfabrieken Transmitting arrangement for use in tone frequency pushbutton selection systems

Also Published As

Publication number Publication date
DE1172737B (en) 1964-06-25

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