BE435699A - - Google Patents

Info

Publication number
BE435699A
BE435699A BE435699DA BE435699A BE 435699 A BE435699 A BE 435699A BE 435699D A BE435699D A BE 435699DA BE 435699 A BE435699 A BE 435699A
Authority
BE
Belgium
Application number
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.)
Publication of BE435699A publication Critical patent/BE435699A/xx

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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Relay Circuits (AREA)
BE435699D 1938-07-30 BE435699A (en:Method)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95315D DE724392C (de) 1938-07-30 1938-07-30 Schaltungsanordnung zur Erzeugung von zwei im Takt einer dritten Frequenz abwechselnden Tonfrequenzen fuer die Tonfrequenzwahl in Fernsprechanlagen

Publications (1)

Publication Number Publication Date
BE435699A true BE435699A (en:Method)

Family

ID=7288086

Family Applications (1)

Application Number Title Priority Date Filing Date
BE435699D BE435699A (en:Method) 1938-07-30

Country Status (6)

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

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
CH212069A (de) 1940-10-31
DE724392C (de) 1942-08-25
NL54870C (en:Method)
US2285088A (en) 1942-06-02
FR858470A (fr) 1940-11-26

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