BE841906R - Circuit de reconnaissance de la frequence d'un signal - Google Patents

Circuit de reconnaissance de la frequence d'un signal

Info

Publication number
BE841906R
BE841906R BE2055032A BE2055032A BE841906R BE 841906 R BE841906 R BE 841906R BE 2055032 A BE2055032 A BE 2055032A BE 2055032 A BE2055032 A BE 2055032A BE 841906 R BE841906 R BE 841906R
Authority
BE
Belgium
Prior art keywords
signal frequency
recognition circuit
frequency recognition
circuit
signal
Prior art date
Application number
BE2055032A
Other languages
English (en)
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
Application granted granted Critical
Publication of BE841906R publication Critical patent/BE841906R/fr

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
BE2055032A 1975-04-10 1976-05-17 Circuit de reconnaissance de la frequence d'un signal BE841906R (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752515769 DE2515769A1 (de) 1975-04-10 1975-04-10 Frequenzselektiver signalempfaenger

Publications (1)

Publication Number Publication Date
BE841906R true BE841906R (fr) 1976-11-17

Family

ID=5943564

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2055032A BE841906R (fr) 1975-04-10 1976-05-17 Circuit de reconnaissance de la frequence d'un signal

Country Status (5)

Country Link
AU (1) AU1290076A (fr)
BE (1) BE841906R (fr)
DE (1) DE2515769A1 (fr)
FR (1) FR2307402A1 (fr)
GB (1) GB1518006A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7511707A (nl) * 1975-10-06 1977-04-12 Philips Nv Kruiscorrelatie-inrichting.
US4185172A (en) 1976-12-17 1980-01-22 Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. Method of and means for detecting digitized multi frequency-coded signals
IT1072242B (it) * 1976-12-17 1985-04-10 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica
GB2032737A (en) * 1978-10-24 1980-05-08 Standard Telephones Cables Ltd Radio receiver for tone modulated signals
FR2451691A1 (fr) * 1979-03-16 1980-10-10 Thomson Csf Circuit comparateur de frequences et dispositif d'appel selectif comportant un tel circuit
US4783845A (en) * 1985-12-20 1988-11-08 Itt Aerospace Optical Digital tone squelch detector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2422839A1 (de) * 1974-05-10 1975-12-11 Standard Elektrik Lorenz Ag Frequenzselektiver signalempfaenger

Also Published As

Publication number Publication date
GB1518006A (en) 1978-07-19
DE2515769A1 (de) 1976-10-21
FR2307402A1 (fr) 1976-11-05
AU1290076A (en) 1977-10-20

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