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
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 CA239,887A priority patent/CA994433A/en
Priority to CA239,888A priority patent/CA994434A/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
CA239,887A CA994433A (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

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 (en) 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 (en)
CA (1) CA994484A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543677B2 (en) * 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 (en) * 1976-12-10 1978-07-07 Constr Telephoniques MULTI-FREQUENCY SIGNAL RECEIVER
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

Also Published As

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

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