CH212069A - Device for generating two tone frequencies alternating after a third frequency. - Google Patents

Device for generating two tone frequencies alternating after a third frequency.

Info

Publication number
CH212069A
CH212069A CH212069DA CH212069A CH 212069 A CH212069 A CH 212069A CH 212069D A CH212069D A CH 212069DA CH 212069 A CH212069 A CH 212069A
Authority
CH
Switzerland
Prior art keywords
generating
frequency
tone frequencies
frequencies alternating
alternating
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft C Lorenz
Original Assignee
Lorenz C 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 Lorenz C Ag filed Critical Lorenz C Ag
Publication of CH212069A publication Critical patent/CH212069A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transmitters (AREA)
  • Relay Circuits (AREA)
CH212069D 1938-07-30 1939-07-26 Device for generating two tone frequencies alternating after a third frequency. CH212069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95315D DE724392C (en) 1938-07-30 1938-07-30 Circuit arrangement for the generation of two tone frequencies alternating at a third frequency for tone frequency selection in telephone systems

Publications (1)

Publication Number Publication Date
CH212069A true CH212069A (en) 1940-10-31

Family

ID=7288086

Family Applications (1)

Application Number Title Priority Date Filing Date
CH212069D CH212069A (en) 1938-07-30 1939-07-26 Device for generating two tone frequencies alternating after a third frequency.

Country Status (6)

Country Link
US (1) US2285088A (en)
BE (1) BE435699A (en)
CH (1) CH212069A (en)
DE (1) DE724392C (en)
FR (1) FR858470A (en)
NL (1) NL54870C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510531A (en) * 1947-10-31 1950-06-06 Rca Corp Transmitter monitor

Also Published As

Publication number Publication date
FR858470A (en) 1940-11-26
DE724392C (en) 1942-08-25
BE435699A (en)
US2285088A (en) 1942-06-02
NL54870C (en)

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