FR2270592B3 - - Google Patents

Info

Publication number
FR2270592B3
FR2270592B3 FR7514266A FR7514266A FR2270592B3 FR 2270592 B3 FR2270592 B3 FR 2270592B3 FR 7514266 A FR7514266 A FR 7514266A FR 7514266 A FR7514266 A FR 7514266A FR 2270592 B3 FR2270592 B3 FR 2270592B3
Authority
FR
France
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
FR7514266A
Other versions
FR2270592A1 (en
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of FR2270592A1 publication Critical patent/FR2270592A1/fr
Application granted granted Critical
Publication of FR2270592B3 publication Critical patent/FR2270592B3/fr
Granted 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
    • 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)
FR7514266A 1974-05-10 1975-05-07 Signal frequency detector for push button dialing - measures period during clock source controlled periods Granted FR2270592A1 (en)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FR2270592A1 FR2270592A1 (en) 1975-12-05
FR2270592B3 true FR2270592B3 (fr) 1978-11-17

Family

ID=5915253

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7514266A Granted FR2270592A1 (en) 1974-05-10 1975-05-07 Signal frequency detector for push button dialing - measures period during clock source controlled periods

Country Status (3)

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

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
BE828928R (fr) 1975-11-12
FR2270592A1 (en) 1975-12-05

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