CA976675A - Dual tone receiver - Google Patents

Dual tone receiver

Info

Publication number
CA976675A
CA976675A CA153,991A CA153991A CA976675A CA 976675 A CA976675 A CA 976675A CA 153991 A CA153991 A CA 153991A CA 976675 A CA976675 A CA 976675A
Authority
CA
Canada
Prior art keywords
dual tone
tone receiver
receiver
dual
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
CA153,991A
Other languages
English (en)
Other versions
CA153991S (en
Inventor
Michael C.J. Cowpland
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.)
Microsystems International Ltd
Original Assignee
Microsystems International Ltd
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 Microsystems International Ltd filed Critical Microsystems International Ltd
Priority to CA153,991A priority Critical patent/CA976675A/en
Priority to US00313106A priority patent/US3795775A/en
Priority to AU56622/73A priority patent/AU5662273A/en
Priority to JP48082471A priority patent/JPS4974809A/ja
Priority to NL7311066A priority patent/NL7311066A/xx
Priority to FR7332036A priority patent/FR2203248A1/fr
Priority to BE135968A priority patent/BE805227A/xx
Priority to DE19732348056 priority patent/DE2348056A1/de
Priority to IT29598/73A priority patent/IT993965B/it
Application granted granted Critical
Publication of CA976675A publication Critical patent/CA976675A/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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
CA153,991A 1972-10-16 1972-10-16 Dual tone receiver Expired CA976675A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CA153,991A CA976675A (en) 1972-10-16 1972-10-16 Dual tone receiver
US00313106A US3795775A (en) 1972-10-16 1972-12-07 Dual tone receiver
AU56622/73A AU5662273A (en) 1972-10-16 1973-06-06 Dual tone receiver dual tone receiver
JP48082471A JPS4974809A (it) 1972-10-16 1973-07-17
NL7311066A NL7311066A (it) 1972-10-16 1973-08-10
FR7332036A FR2203248A1 (it) 1972-10-16 1973-09-05
BE135968A BE805227A (fr) 1972-10-16 1973-09-24 Recepteur de signaux a double tonalite
DE19732348056 DE2348056A1 (de) 1972-10-16 1973-09-25 Dualtonempfaenger
IT29598/73A IT993965B (it) 1972-10-16 1973-10-01 Ricevitore a tono doppio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA153,991A CA976675A (en) 1972-10-16 1972-10-16 Dual tone receiver

Publications (1)

Publication Number Publication Date
CA976675A true CA976675A (en) 1975-10-21

Family

ID=4094689

Family Applications (1)

Application Number Title Priority Date Filing Date
CA153,991A Expired CA976675A (en) 1972-10-16 1972-10-16 Dual tone receiver

Country Status (9)

Country Link
US (1) US3795775A (it)
JP (1) JPS4974809A (it)
AU (1) AU5662273A (it)
BE (1) BE805227A (it)
CA (1) CA976675A (it)
DE (1) DE2348056A1 (it)
FR (1) FR2203248A1 (it)
IT (1) IT993965B (it)
NL (1) NL7311066A (it)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3930127A (en) * 1974-01-18 1975-12-30 Baldwin Electronics Inc Tone detector
JPS5543677B2 (it) * 1974-05-15 1980-11-07
JPS50151406A (it) * 1974-05-25 1975-12-05
US3971899A (en) * 1975-04-18 1976-07-27 Mcintosh Alexander C Signalling device for key telephone systems
JPS5234608A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system
JPS5234607A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system
JPS5242308A (en) * 1975-10-01 1977-04-01 Iwatsu Electric Co Ltd Multiplex frequency signal receiver
CA1031086A (en) * 1976-03-03 1978-05-09 Northern Electric Company Method and apparatus for translating multiple frequency signalling
JPS6019283U (ja) * 1976-03-03 1985-02-09 ノ−ザン・テレコム・リミテツド 多重周波数信号受信器
US4028501A (en) * 1976-03-04 1977-06-07 Northern Electric Company Limited Method and apparatus for translating multiple frequency signalling
US4042790A (en) * 1976-05-17 1977-08-16 Stromberg-Carlson Corporation Voice guard circuit for a tone receiver
US4386239A (en) * 1980-06-17 1983-05-31 Bell Telephone Laboratories, Incorporated Multifrequency tone detector
JPH03132291A (ja) * 1989-10-18 1991-06-05 Fujitsu Ltd Ｐｂ信号検出方式
FR3134367B1 (fr) 2022-04-08 2024-02-23 Psa Automobiles Sa Dispositif de protection du chargeur de batteries pour véhicules électriques et hybrides

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582562A (en) * 1969-05-07 1971-06-01 Itt Key telephone intercommunication system
JPS5138484B1 (it) * 1970-07-03 1976-10-22
US3743945A (en) * 1970-12-23 1973-07-03 Itt Limiter for multi frequency voice receiver

Also Published As

Publication number Publication date
DE2348056A1 (de) 1974-04-18
JPS4974809A (it) 1974-07-19
NL7311066A (it) 1974-04-18
FR2203248A1 (it) 1974-05-10
AU5662273A (en) 1974-12-12
IT993965B (it) 1975-09-30
BE805227A (fr) 1974-01-16
US3795775A (en) 1974-03-05

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