MX143883A - Mejoras a un circuito receptor de llamada acustica especialmente para aparatos telefonicos - Google Patents
Mejoras a un circuito receptor de llamada acustica especialmente para aparatos telefonicosInfo
- Publication number
- MX143883A MX143883A MX171295A MX17129577A MX143883A MX 143883 A MX143883 A MX 143883A MX 171295 A MX171295 A MX 171295A MX 17129577 A MX17129577 A MX 17129577A MX 143883 A MX143883 A MX 143883A
- Authority
- MX
- Mexico
- Prior art keywords
- receiving circuit
- call receiving
- telephone devices
- circuit especially
- acoustic call
- Prior art date
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)
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 |
---|---|
MX143883A true MX143883A (es) | 1981-07-29 |
Family
ID=11159033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MX171295A MX143883A (es) | 1977-01-24 | 1977-11-11 | Mejoras a un circuito receptor de llamada acustica especialmente para aparatos telefonicos |
Country Status (9)
Country | Link |
---|---|
US (1) | US4154989A (es) |
AU (1) | AU512904B2 (es) |
BR (1) | BR7708728A (es) |
DE (1) | DE2802982A1 (es) |
FR (1) | FR2378410A1 (es) |
IT (1) | IT1143632B (es) |
MX (1) | MX143883A (es) |
NL (1) | NL7800775A (es) |
NZ (1) | NZ186190A (es) |
Families Citing this family (4)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL288870A (es) * | 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 |
-
1977
- 1977-01-24 IT IT19557/77A patent/IT1143632B/it active
- 1977-11-11 MX MX171295A patent/MX143883A/es unknown
- 1977-12-29 BR BR7708728A patent/BR7708728A/pt unknown
-
1978
- 1978-01-11 NZ NZ186190A patent/NZ186190A/xx unknown
- 1978-01-18 FR FR7801365A patent/FR2378410A1/fr active Granted
- 1978-01-18 AU AU32510/78A patent/AU512904B2/en not_active Expired
- 1978-01-23 NL NL7800775A patent/NL7800775A/xx not_active Application Discontinuation
- 1978-01-23 US US05/871,484 patent/US4154989A/en not_active Expired - Lifetime
- 1978-01-24 DE DE19782802982 patent/DE2802982A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
NZ186190A (en) | 1981-03-16 |
AU3251078A (en) | 1979-07-26 |
DE2802982A1 (de) | 1978-08-03 |
AU512904B2 (en) | 1980-11-06 |
FR2378410B1 (es) | 1981-01-09 |
FR2378410A1 (fr) | 1978-08-18 |
NL7800775A (nl) | 1978-07-26 |
BR7708728A (pt) | 1978-09-05 |
IT1143632B (it) | 1986-10-22 |
US4154989A (en) | 1979-05-15 |
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