BE805227A - Recepteur de signaux a double tonalite - Google Patents

Recepteur de signaux a double tonalite

Info

Publication number
BE805227A
BE805227A BE135968A BE135968A BE805227A BE 805227 A BE805227 A BE 805227A BE 135968 A BE135968 A BE 135968A BE 135968 A BE135968 A BE 135968A BE 805227 A BE805227 A BE 805227A
Authority
BE
Belgium
Prior art keywords
signal receiver
tone signal
dual tone
dual
receiver
Prior art date
Application number
BE135968A
Other languages
English (en)
French (fr)
Inventor
M C J Cowpland
Original Assignee
Microsystems Int 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 Int Ltd filed Critical Microsystems Int Ltd
Publication of BE805227A publication Critical patent/BE805227A/xx

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)
BE135968A 1972-10-16 1973-09-24 Recepteur de signaux a double tonalite BE805227A (fr)

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
BE805227A true BE805227A (fr) 1974-01-16

Family

ID=4094689

Family Applications (1)

Application Number Title Priority Date Filing Date
BE135968A BE805227A (fr) 1972-10-16 1973-09-24 Recepteur de signaux a double tonalite

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
JPS5234607A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system
JPS5234608A (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
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
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
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
NL7311066A (it) 1974-04-18
CA976675A (en) 1975-10-21
US3795775A (en) 1974-03-05
JPS4974809A (it) 1974-07-19
DE2348056A1 (de) 1974-04-18
FR2203248A1 (it) 1974-05-10
IT993965B (it) 1975-09-30
AU5662273A (en) 1974-12-12

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