BE828927A - Circuit de reconnaissance de la frequence d'un signal - Google Patents

Circuit de reconnaissance de la frequence d'un signal

Info

Publication number
BE828927A
BE828927A BE2054337A BE2054337A BE828927A BE 828927 A BE828927 A BE 828927A BE 2054337 A BE2054337 A BE 2054337A BE 2054337 A BE2054337 A BE 2054337A BE 828927 A BE828927 A BE 828927A
Authority
BE
Belgium
Prior art keywords
signal frequency
recognition circuit
frequency recognition
circuit
signal
Prior art date
Application number
BE2054337A
Other languages
English (en)
French (fr)
Inventor
L Gasser
D Illi
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 filed Critical
Publication of BE828927A publication Critical patent/BE828927A/xx

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
    • 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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
BE2054337A 1974-05-10 1975-05-12 Circuit de reconnaissance de la frequence d'un signal BE828927A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742422839 DE2422839A1 (de) 1974-05-10 1974-05-10 Frequenzselektiver signalempfaenger

Publications (1)

Publication Number Publication Date
BE828927A true BE828927A (fr) 1975-11-12

Family

ID=5915252

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2054337A BE828927A (fr) 1974-05-10 1975-05-12 Circuit de reconnaissance de la frequence d'un signal

Country Status (3)

Country Link
BE (1) BE828927A (ref)
DE (1) DE2422839A1 (ref)
FR (1) FR2270591A1 (ref)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2515769A1 (de) * 1975-04-10 1976-10-21 Standard Elektrik Lorenz Ag Frequenzselektiver signalempfaenger

Also Published As

Publication number Publication date
DE2422839A1 (de) 1975-12-11
FR2270591A1 (en) 1975-12-05
FR2270591B3 (ref) 1978-11-17

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