FR858470A - Electrical assembly device for generating two alternating sound frequencies from a third frequency - Google Patents

Electrical assembly device for generating two alternating sound frequencies from a third frequency

Info

Publication number
FR858470A
FR858470A FR858470DA FR858470A FR 858470 A FR858470 A FR 858470A FR 858470D A FR858470D A FR 858470DA FR 858470 A FR858470 A FR 858470A
Authority
FR
France
Prior art keywords
generating
frequency
assembly device
electrical assembly
sound frequencies
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
C Lorenz 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 Standard Elektrik Lorenz AG, C Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of FR858470A publication Critical patent/FR858470A/en
Expired legal-status Critical Current

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)
  • Relay Circuits (AREA)
  • Transmitters (AREA)
FR858470D 1938-07-30 1939-07-24 Electrical assembly device for generating two alternating sound frequencies from a third frequency Expired FR858470A (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
FR858470A true FR858470A (en) 1940-11-26

Family

ID=7288086

Family Applications (1)

Application Number Title Priority Date Filing Date
FR858470D Expired FR858470A (en) 1938-07-30 1939-07-24 Electrical assembly device for generating two alternating sound frequencies from 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
CH212069A (en) 1940-10-31
US2285088A (en) 1942-06-02
DE724392C (en) 1942-08-25
NL54870C (en)
BE435699A (en)

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