BR7708728A - Circuito receptor de chamada acustica,especialmente para aparelhos telefonicos - Google Patents

Circuito receptor de chamada acustica,especialmente para aparelhos telefonicos

Info

Publication number
BR7708728A
BR7708728A BR7708728A BR7708728A BR7708728A BR 7708728 A BR7708728 A BR 7708728A BR 7708728 A BR7708728 A BR 7708728A BR 7708728 A BR7708728 A BR 7708728A BR 7708728 A BR7708728 A BR 7708728A
Authority
BR
Brazil
Prior art keywords
acustic
receiver circuit
call receiver
telephone devices
telephone
Prior art date
Application number
BR7708728A
Other languages
English (en)
Inventor
R Pipitone
Original Assignee
Siemens Spa Italiana
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 Siemens Spa Italiana filed Critical Siemens Spa Italiana
Publication of BR7708728A publication Critical patent/BR7708728A/pt

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)
BR7708728A 1977-01-24 1977-12-29 Circuito receptor de chamada acustica,especialmente para aparelhos telefonicos BR7708728A (pt)

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
BR7708728A true BR7708728A (pt) 1978-09-05

Family

ID=11159033

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7708728A BR7708728A (pt) 1977-01-24 1977-12-29 Circuito receptor de chamada acustica,especialmente para aparelhos telefonicos

Country Status (9)

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

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 (pt) * 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
AU3251078A (en) 1979-07-26
MX143883A (es) 1981-07-29
NL7800775A (nl) 1978-07-26
NZ186190A (en) 1981-03-16
AU512904B2 (en) 1980-11-06
FR2378410B1 (pt) 1981-01-09
FR2378410A1 (fr) 1978-08-18
US4154989A (en) 1979-05-15
IT1143632B (it) 1986-10-22
DE2802982A1 (de) 1978-08-03

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