FR2132303A1 - - Google Patents
Info
- Publication number
- FR2132303A1 FR2132303A1 FR7211397A FR7211397A FR2132303A1 FR 2132303 A1 FR2132303 A1 FR 2132303A1 FR 7211397 A FR7211397 A FR 7211397A FR 7211397 A FR7211397 A FR 7211397A FR 2132303 A1 FR2132303 A1 FR 2132303A1
- 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.)
- Granted
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)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712116635 DE2116635C3 (en) | 1971-04-05 | 1971-04-05 | Method for digital decoding of frequency-coded signals and circuit arrangement for carrying out the method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2132303A1 true FR2132303A1 (en) | 1972-11-17 |
| FR2132303B1 FR2132303B1 (en) | 1974-08-02 |
Family
ID=5803944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7211397A Expired FR2132303B1 (en) | 1971-04-05 | 1972-03-28 |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5317015B1 (en) |
| BR (2) | BR7101977D0 (en) |
| CA (1) | CA974645A (en) |
| CH (1) | CH540622A (en) |
| DE (1) | DE2116635C3 (en) |
| ES (2) | ES401437A1 (en) |
| FR (1) | FR2132303B1 (en) |
| GB (1) | GB1364773A (en) |
| IT (1) | IT947887B (en) |
| NL (1) | NL167827C (en) |
| SE (1) | SE384619B (en) |
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 (en) * | 1977-03-23 | 1979-12-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Speech-protected, frequency-selective character receiver |
| CA1137565A (en) * | 1979-05-22 | 1982-12-14 | Masaharu Kawaguchi | Digital multi-frequency receiver |
| DE3026016C2 (en) * | 1980-07-09 | 1984-12-13 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for demodulating mixed frequencies received at a central station |
| DE3115151A1 (en) * | 1981-04-15 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Circuit arrangement for evaluating AC signals formed from a plurality of simultaneously transmitted alternating currents with different signal frequencies, in telecommunications systems |
| SE9202065L (en) * | 1992-07-03 | 1994-01-04 | Ericsson Telefon Ab L M | Ways to improve receiver sensitivity and speech immunity in DTMF reception |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1511133A (en) * | 1966-12-16 | 1968-01-26 | Ass Ouvriers Instr Precision | Method for identifying each of the frequencies of a group of several determined frequencies and receiving apparatus for implementing this method |
| FR1579910A (en) * | 1967-09-15 | 1969-08-29 |
-
1971
- 1971-04-05 BR BR197771A patent/BR7101977D0/en unknown
- 1971-04-05 DE DE19712116635 patent/DE2116635C3/en not_active Expired
-
1972
- 1972-02-25 IT IT2101672A patent/IT947887B/en active
- 1972-03-06 SE SE282972A patent/SE384619B/en unknown
- 1972-03-16 GB GB1222972A patent/GB1364773A/en not_active Expired
- 1972-03-23 CH CH436872A patent/CH540622A/en 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/en not_active IP Right Cessation
- 1972-04-03 JP JP3271072A patent/JPS5317015B1/ja active Pending
- 1972-04-04 ES ES401437A patent/ES401437A1/en not_active Expired
- 1972-04-04 ES ES401435A patent/ES401435A1/en not_active Expired
- 1972-04-05 BR BR197772A patent/BR7201977D0/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1511133A (en) * | 1966-12-16 | 1968-01-26 | Ass Ouvriers Instr Precision | Method for identifying each of the frequencies of a group of several determined frequencies and receiving apparatus for implementing this method |
| FR1579910A (en) * | 1967-09-15 | 1969-08-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| ES401435A1 (en) | 1975-02-16 |
| NL7204207A (en) | 1972-10-09 |
| DE2116635B2 (en) | 1973-10-04 |
| ES401437A1 (en) | 1975-10-01 |
| SE384619B (en) | 1976-05-10 |
| BR7201977D0 (en) | 1974-11-12 |
| IT947887B (en) | 1973-05-30 |
| CA974645A (en) | 1975-09-16 |
| FR2132303B1 (en) | 1974-08-02 |
| BR7101977D0 (en) | 1973-06-14 |
| GB1364773A (en) | 1974-08-29 |
| DE2116635C3 (en) | 1978-10-05 |
| JPS5317015B1 (en) | 1978-06-05 |
| DE2116635A1 (en) | 1972-10-19 |
| NL167827C (en) | 1982-01-18 |
| CH540622A (en) | 1973-08-15 |