FR2132303B1 - - Google Patents
Info
- Publication number
- FR2132303B1 FR2132303B1 FR7211397A FR7211397A FR2132303B1 FR 2132303 B1 FR2132303 B1 FR 2132303B1 FR 7211397 A FR7211397 A FR 7211397A FR 7211397 A FR7211397 A FR 7211397A FR 2132303 B1 FR2132303 B1 FR 2132303B1
- Authority
- FR
- France
- 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
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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Analogue/Digital Conversion (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712116635 DE2116635C3 (de) | 1971-04-05 | 1971-04-05 | Verfahren zur digitalen Decodierung frequenzcodierter Signale und Schaltungsanordnung zur Durchführung des Verfahrens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2132303A1 FR2132303A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1972-11-17 |
| FR2132303B1 true FR2132303B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-08-02 |
Family
ID=5803944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7211397A Expired FR2132303B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1971-04-05 | 1972-03-28 |
Country Status (11)
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3936801A (en) * | 1974-09-12 | 1976-02-03 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver timing circuit |
| CA1031086A (en) * | 1976-03-03 | 1978-05-09 | Northern Electric Company | Method and apparatus for translating multiple frequency signalling |
| DE2712847C3 (de) * | 1977-03-23 | 1979-12-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Sprachgeschützter frequenzselektiver Zeichenempfänger |
| CA1137565A (en) * | 1979-05-22 | 1982-12-14 | Masaharu Kawaguchi | Digital multi-frequency receiver |
| DE3026016C2 (de) * | 1980-07-09 | 1984-12-13 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur Demodulation von Frequenzgemischen, die an einer Zentralstation empfangen werden |
| DE3115151A1 (de) * | 1981-04-15 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen |
| SE9202065L (sv) * | 1992-07-03 | 1994-01-04 | Ericsson Telefon Ab L M | Sätt att förbättra mottagarens känslighet och talimmuniteten vid DTMF-mottagning |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1511133A (fr) * | 1966-12-16 | 1968-01-26 | Ass Ouvriers Instr Precision | Procédé d'identification de chacune des fréquences d'un groupe de plusieurs fréquences déterminées et appareil récepteur pour la mise en oeuvre de ce procédé |
| NL6712685A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1967-09-15 | 1969-03-18 |
-
1971
- 1971-04-05 BR BR197771A patent/BR7101977D0/pt unknown
- 1971-04-05 DE DE19712116635 patent/DE2116635C3/de not_active Expired
-
1972
- 1972-02-25 IT IT2101672A patent/IT947887B/it active
- 1972-03-06 SE SE282972A patent/SE384619B/xx unknown
- 1972-03-16 GB GB1222972A patent/GB1364773A/en not_active Expired
- 1972-03-23 CH CH436872A patent/CH540622A/de not_active IP Right Cessation
- 1972-03-28 FR FR7211397A patent/FR2132303B1/fr not_active Expired
- 1972-03-29 CA CA138,503A patent/CA974645A/en not_active Expired
- 1972-03-29 NL NL7204207A patent/NL167827C/xx not_active IP Right Cessation
- 1972-04-03 JP JP3271072A patent/JPS5317015B1/ja active Pending
- 1972-04-04 ES ES401437A patent/ES401437A1/es not_active Expired
- 1972-04-04 ES ES401435A patent/ES401435A1/es not_active Expired
- 1972-04-05 BR BR197772A patent/BR7201977D0/pt unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5317015B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1978-06-05 |
| NL167827C (nl) | 1982-01-18 |
| CA974645A (en) | 1975-09-16 |
| IT947887B (it) | 1973-05-30 |
| SE384619B (sv) | 1976-05-10 |
| CH540622A (de) | 1973-08-15 |
| NL7204207A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1972-10-09 |
| FR2132303A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1972-11-17 |
| ES401437A1 (es) | 1975-10-01 |
| ES401435A1 (es) | 1975-02-16 |
| GB1364773A (en) | 1974-08-29 |
| DE2116635B2 (de) | 1973-10-04 |
| BR7201977D0 (pt) | 1974-11-12 |
| DE2116635C3 (de) | 1978-10-05 |
| DE2116635A1 (de) | 1972-10-19 |
| BR7101977D0 (pt) | 1973-06-14 |