CA1034210A - Multifrequency tone detection - Google Patents

Multifrequency tone detection

Info

Publication number
CA1034210A
CA1034210A CA225,942A CA225942A CA1034210A CA 1034210 A CA1034210 A CA 1034210A CA 225942 A CA225942 A CA 225942A CA 1034210 A CA1034210 A CA 1034210A
Authority
CA
Canada
Prior art keywords
tone detection
multifrequency tone
multifrequency
detection
tone
Prior art date
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
CA225,942A
Other languages
English (en)
French (fr)
Other versions
CA225942S (en
Inventor
Robert L. Carbrey
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 Corp
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
Application granted granted Critical
Publication of CA1034210A publication Critical patent/CA1034210A/en
Expired 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)
  • Complex Calculations (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
CA225,942A 1974-08-12 1975-04-30 Multifrequency tone detection Expired CA1034210A (en)

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 (1)

Publication Number Publication Date
CA1034210A true CA1034210A (en) 1978-07-04

Family

ID=23973732

Family Applications (1)

Application Number Title Priority Date Filing Date
CA225,942A Expired CA1034210A (en) 1974-08-12 1975-04-30 Multifrequency tone detection

Country Status (7)

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

Families Citing this family (9)

* 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
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
FR94830E (fr) * 1966-04-04 1969-11-28 Cit Alcatel Procédé et dispositif pour l'identification des fréquences par des circuits logiques.
FR1488289A (fr) * 1966-04-04 1967-07-13 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
GB1510859A (en) 1978-05-17
JPS5144407A (sv) 1976-04-16
US3934097A (en) 1976-01-20
FR2282202A1 (fr) 1976-03-12
SE7508732L (sv) 1976-02-13
DE2535730A1 (de) 1976-03-04
FR2282202B1 (sv) 1980-09-05

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