USB349948I5 - - Google Patents

Info

Publication number
USB349948I5
USB349948I5 US34994873A USB349948I5 US B349948 I5 USB349948 I5 US B349948I5 US 34994873 A US34994873 A US 34994873A US B349948 I5 USB349948 I5 US B349948I5
Authority
US
United States
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.)
Pending
Application number
Other languages
English (en)
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
Priority to US349948A priority Critical patent/US3914557A/en
Priority to CA188,538A priority patent/CA994484A/en
Publication of USB349948I5 publication Critical patent/USB349948I5/en
Application granted granted Critical
Publication of US3914557A publication Critical patent/US3914557A/en
Priority to CA239,889A priority patent/CA994435A/en
Priority to CA239,888A priority patent/CA994434A/en
Priority to CA239,887A priority patent/CA994433A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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)
US349948A 1973-04-11 1973-04-11 Multifrequency tone detecting arrangement Expired - Lifetime US3914557A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US349948A US3914557A (en) 1973-04-11 1973-04-11 Multifrequency tone detecting arrangement
CA188,538A CA994484A (en) 1973-04-11 1973-12-19 Multifrequency tone detecting arrangement
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 (2)

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

Family

ID=23374653

Family Applications (1)

Application Number Title Priority Date Filing Date
US349948A Expired - Lifetime US3914557A (en) 1973-04-11 1973-04-11 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (7)

* 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
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

Citations (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
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver

Patent Citations (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
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
US3914557A (en) 1975-10-21
CA994484A (en) 1976-08-03

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