BE828928R - Circuit de reconnaissance de la frequence d'un signal - Google Patents

Circuit de reconnaissance de la frequence d'un signal

Info

Publication number
BE828928R
BE828928R BE2054338A BE2054338A BE828928R BE 828928 R BE828928 R BE 828928R BE 2054338 A BE2054338 A BE 2054338A BE 2054338 A BE2054338 A BE 2054338A BE 828928 R BE828928 R BE 828928R
Authority
BE
Belgium
Prior art keywords
signal frequency
recognition circuit
frequency recognition
circuit
signal
Prior art date
Application number
BE2054338A
Other languages
English (en)
French (fr)
Inventor
L Casser
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
Application granted granted Critical
Publication of BE828928R publication Critical patent/BE828928R/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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
BE2054338A 1974-05-10 1975-05-12 Circuit de reconnaissance de la frequence d'un signal BE828928R (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742422840 DE2422840A1 (de) 1974-05-10 1974-05-10 Frequenzselektiver signalempfaenger

Publications (1)

Publication Number Publication Date
BE828928R true BE828928R (fr) 1975-11-12

Family

ID=5915253

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2054338A BE828928R (fr) 1974-05-10 1975-05-12 Circuit de reconnaissance de la frequence d'un signal

Country Status (3)

Country Link
BE (1) BE828928R (xx)
DE (1) DE2422840A1 (xx)
FR (1) FR2270592A1 (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2521983A1 (de) * 1975-05-16 1976-11-25 Standard Elektrik Lorenz Ag Frequenzselektiver signalempfaenger
DE2712847C3 (de) * 1977-03-23 1979-12-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Sprachgeschützter frequenzselektiver Zeichenempfänger
DE3026016C2 (de) * 1980-07-09 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Demodulation von Frequenzgemischen, die an einer Zentralstation empfangen werden
FR2808140B1 (fr) * 2000-04-20 2002-07-05 St Microelectronics Sa Circuit de detection de signaux electriques a une frequence determinee

Also Published As

Publication number Publication date
DE2422840A1 (de) 1975-12-11
FR2270592B3 (xx) 1978-11-17
FR2270592A1 (en) 1975-12-05

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