FR2282202B1 - - Google Patents

Info

Publication number
FR2282202B1
FR2282202B1 FR7524961A FR7524961A FR2282202B1 FR 2282202 B1 FR2282202 B1 FR 2282202B1 FR 7524961 A FR7524961 A FR 7524961A FR 7524961 A FR7524961 A FR 7524961A FR 2282202 B1 FR2282202 B1 FR 2282202B1
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
FR7524961A
Other languages
French (fr)
Other versions
FR2282202A1 (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.)
AT&T Inc
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2282202A1 publication Critical patent/FR2282202A1/fr
Application granted granted Critical
Publication of FR2282202B1 publication Critical patent/FR2282202B1/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Complex Calculations (AREA)
FR7524961A 1974-08-12 1975-08-11 Procede et appareil de detection de tonalites Granted FR2282202A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/496,695 US3934097A (en) 1974-08-12 1974-08-12 Multifrequency tone detection

Publications (2)

Publication Number Publication Date
FR2282202A1 FR2282202A1 (fr) 1976-03-12
FR2282202B1 true FR2282202B1 (ref) 1980-09-05

Family

ID=23973732

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7524961A Granted FR2282202A1 (fr) 1974-08-12 1975-08-11 Procede et appareil de detection de tonalites

Country Status (7)

Country Link
US (1) US3934097A (ref)
JP (1) JPS5144407A (ref)
CA (1) CA1034210A (ref)
DE (1) DE2535730A1 (ref)
FR (1) FR2282202A1 (ref)
GB (1) GB1510859A (ref)
SE (1) SE7508732L (ref)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135150A (en) * 1977-08-12 1979-01-16 Ledex, Inc. Decoder circuit for detecting sequentially presented code digit signals
US4351032A (en) * 1978-12-04 1982-09-21 General Electric Company Frequency sensing circuit
US4352194A (en) * 1980-07-25 1982-09-28 Rca Corporation System and method for frequency discrimination
JPS5776987A (en) * 1980-10-29 1982-05-14 Sony Corp Signal detection circuit
JPS58192659U (ja) * 1982-06-18 1983-12-21 三菱製紙株式会社 電子写真用液体現像装置
JPS58192656U (ja) * 1982-06-18 1983-12-21 三菱製紙株式会社 電子写真用液体現像装置
JPS58192658U (ja) * 1982-06-18 1983-12-21 三菱製紙株式会社 電子写真用液体現像装置
GB2198568A (en) * 1986-12-12 1988-06-15 Motorola Israel Ltd Current tone detection
JP3452430B2 (ja) * 1995-09-11 2003-09-29 富士通株式会社 情報信号検出装置および情報信号検出方法
US5905755A (en) * 1996-07-17 1999-05-18 Northern Telecom Limited Method and circuit for data regeneration of a data stream

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441682A (en) * 1965-05-28 1969-04-29 Bell Telephone Labor Inc Multifrequency signal receiver with compensation for power source variations
FR1488289A (fr) * 1966-04-04 1967-07-13 Cit Alcatel Procédé et dispositif pour l'identification des fréquences par des circuits logiques
FR94830E (fr) * 1966-04-04 1969-11-28 Cit Alcatel Procédé et dispositif pour l'identification des fréquences par des circuits logiques.
US3578919A (en) * 1968-12-30 1971-05-18 Bell Telephone Labor Inc Time compression tone detector

Also Published As

Publication number Publication date
FR2282202A1 (fr) 1976-03-12
DE2535730A1 (de) 1976-03-04
CA1034210A (en) 1978-07-04
GB1510859A (en) 1978-05-17
SE7508732L (sv) 1976-02-13
JPS5144407A (ref) 1976-04-16
US3934097A (en) 1976-01-20

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Legal Events

Date Code Title Description
ST Notification of lapse