CA994484A - Multifrequency tone detecting arrangement - Google Patents

Multifrequency tone detecting arrangement

Info

Publication number
CA994484A
CA994484A CA188,538A CA188538A CA994484A CA 994484 A CA994484 A CA 994484A CA 188538 A CA188538 A CA 188538A CA 994484 A CA994484 A CA 994484A
Authority
CA
Canada
Prior art keywords
detecting arrangement
tone detecting
multifrequency tone
multifrequency
arrangement
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
CA188,538A
Other languages
English (en)
Other versions
CA188538S (en
Inventor
John F. O'neill
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
Priority to CA239,889A priority Critical patent/CA994435A/en
Priority to CA239,888A priority patent/CA994434A/en
Priority to CA239,887A priority patent/CA994433A/en
Application granted granted Critical
Publication of CA994484A publication Critical patent/CA994484A/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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
CA188,538A 1973-04-11 1973-12-19 Multifrequency tone detecting arrangement Expired CA994484A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA239,889A CA994435A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement
CA239,888A CA994434A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement
CA239,887A CA994433A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US349948A US3914557A (en) 1973-04-11 1973-04-11 Multifrequency tone detecting arrangement

Publications (1)

Publication Number Publication Date
CA994484A true CA994484A (en) 1976-08-03

Family

ID=23374653

Family Applications (1)

Application Number Title Priority Date Filing Date
CA188,538A Expired CA994484A (en) 1973-04-11 1973-12-19 Multifrequency tone detecting arrangement

Country Status (2)

Country Link
US (1) US3914557A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA994484A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543677B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1974-05-15 1980-11-07
US3944753A (en) 1974-10-31 1976-03-16 Proctor & Associates Company Apparatus for distinguishing voice and other noise signals from legitimate multi-frequency tone signals present on telephone or similar communication lines
JPS5234607A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system
CA1031086A (en) * 1976-03-03 1978-05-09 Northern Electric Company Method and apparatus for translating multiple frequency signalling
US4028501A (en) * 1976-03-04 1977-06-07 Northern Electric Company Limited Method and apparatus for translating multiple frequency signalling
FR2373926A1 (fr) * 1976-12-10 1978-07-07 Constr Telephoniques Recepteur de signaux multifrequences
US4091243A (en) * 1977-07-26 1978-05-23 Bell Telephone Laboratories, Incorporated Multifrequency signal receiver
US6385253B1 (en) * 1999-12-10 2002-05-07 Next Level Communications Method and apparatus for reliable reception of VDSL signals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3140357A (en) * 1962-06-28 1964-07-07 Bell Telephone Labor Inc Multifrequency receiver
US3582565A (en) * 1969-01-13 1971-06-01 Automatic Elect Lab Tone channels for multifrequency receivers
CA976675A (en) * 1972-10-16 1975-10-21 Microsystems International Limited Dual tone receiver
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver

Also Published As

Publication number Publication date
US3914557A (en) 1975-10-21
USB349948I5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-01-28

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