IT1143632B - Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici - Google Patents

Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici

Info

Publication number
IT1143632B
IT1143632B IT19557/77A IT1955777A IT1143632B IT 1143632 B IT1143632 B IT 1143632B IT 19557/77 A IT19557/77 A IT 19557/77A IT 1955777 A IT1955777 A IT 1955777A IT 1143632 B IT1143632 B IT 1143632B
Authority
IT
Italy
Prior art keywords
detector circuit
telephone devices
call detector
acoustic call
acoustic
Prior art date
Application number
IT19557/77A
Other languages
English (en)
Inventor
Roberto Pipitone
Original Assignee
Sits Soc It Telecom Siemens
Italtel Spa
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 Sits Soc It Telecom Siemens, Italtel Spa filed Critical Sits Soc It Telecom Siemens
Priority to IT19557/77A priority Critical patent/IT1143632B/it
Priority to MX171295A priority patent/MX143883A/es
Priority to BR7708728A priority patent/BR7708728A/pt
Priority to NZ186190A priority patent/NZ186190A/xx
Priority to AU32510/78A priority patent/AU512904B2/en
Priority to FR7801365A priority patent/FR2378410A1/fr
Priority to NL7800775A priority patent/NL7800775A/xx
Priority to US05/871,484 priority patent/US4154989A/en
Priority to DE19782802982 priority patent/DE2802982A1/de
Application granted granted Critical
Publication of IT1143632B publication Critical patent/IT1143632B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Stereo-Broadcasting Methods (AREA)
IT19557/77A 1977-01-24 1977-01-24 Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici IT1143632B (it)

Priority Applications (9)

Application Number Priority Date Filing Date Title
IT19557/77A IT1143632B (it) 1977-01-24 1977-01-24 Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici
MX171295A MX143883A (es) 1977-01-24 1977-11-11 Mejoras a un circuito receptor de llamada acustica especialmente para aparatos telefonicos
BR7708728A BR7708728A (pt) 1977-01-24 1977-12-29 Circuito receptor de chamada acustica,especialmente para aparelhos telefonicos
NZ186190A NZ186190A (en) 1977-01-24 1978-01-11 Acoustic call receiver circuit
AU32510/78A AU512904B2 (en) 1977-01-24 1978-01-18 Subscriber set acoustic call receiving circuit
FR7801365A FR2378410A1 (fr) 1977-01-24 1978-01-18 Circuit receveur d'appel acoustique, specialement pour appareils telephoniques
NL7800775A NL7800775A (nl) 1977-01-24 1978-01-23 Akoestische oproepontvangschakeling, voor het gebruik in telefoontoestellen.
US05/871,484 US4154989A (en) 1977-01-24 1978-01-23 Call-signal receiver for station of telecommunication system
DE19782802982 DE2802982A1 (de) 1977-01-24 1978-01-24 Rufempfangsschaltung fuer einen fernsprechapparat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT19557/77A IT1143632B (it) 1977-01-24 1977-01-24 Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici

Publications (1)

Publication Number Publication Date
IT1143632B true IT1143632B (it) 1986-10-22

Family

ID=11159033

Family Applications (1)

Application Number Title Priority Date Filing Date
IT19557/77A IT1143632B (it) 1977-01-24 1977-01-24 Circuito rivelatore di chiamata acustica,specialmente per apparecchi telefonici

Country Status (9)

Country Link
US (1) US4154989A (it)
AU (1) AU512904B2 (it)
BR (1) BR7708728A (it)
DE (1) DE2802982A1 (it)
FR (1) FR2378410A1 (it)
IT (1) IT1143632B (it)
MX (1) MX143883A (it)
NL (1) NL7800775A (it)
NZ (1) NZ186190A (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1083388B (it) * 1977-06-20 1985-05-21 Cselt Centro Studi Lab Telecom Suoneria elettronica per apparecchi telefonici
IT1127993B (it) * 1980-01-29 1986-05-28 Cselt Centro Studi Lab Telecom Suoneria telefonica di tipo digitale
AU579749B2 (en) * 1982-03-24 1988-12-08 Alcatel Australia Limited A ring signal detector
CA1287417C (en) * 1988-03-04 1991-08-06 Guy Charles Quesnel Digital composite tone alerting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL288870A (it) * 1962-02-12
US3808379A (en) * 1972-05-30 1974-04-30 Gte Automatic Electric Lab Inc Telephone tone ringer
US4042786A (en) * 1976-04-26 1977-08-16 Bell Telephone Laboratories, Incorporated Telephone ringer circuit

Also Published As

Publication number Publication date
NZ186190A (en) 1981-03-16
NL7800775A (nl) 1978-07-26
BR7708728A (pt) 1978-09-05
FR2378410A1 (fr) 1978-08-18
US4154989A (en) 1979-05-15
AU512904B2 (en) 1980-11-06
DE2802982A1 (de) 1978-08-03
FR2378410B1 (it) 1981-01-09
MX143883A (es) 1981-07-29
AU3251078A (en) 1979-07-26

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