FR2295665B1 - - Google Patents
Info
- Publication number
- FR2295665B1 FR2295665B1 FR7441711A FR7441711A FR2295665B1 FR 2295665 B1 FR2295665 B1 FR 2295665B1 FR 7441711 A FR7441711 A FR 7441711A FR 7441711 A FR7441711 A FR 7441711A FR 2295665 B1 FR2295665 B1 FR 2295665B1
- 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)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7441711A FR2295665A1 (fr) | 1974-12-18 | 1974-12-18 | Recepteur numerique de signaux multifrequences |
GB49404/75A GB1492310A (en) | 1974-12-18 | 1975-12-02 | Digital multifrequency signals receiver |
ZA757642A ZA757642B (en) | 1974-12-18 | 1975-12-05 | Digital multifrequency signals receiver |
IE2720/75A IE42621B1 (en) | 1974-12-18 | 1975-12-12 | Digital multifrequency signals receiver |
DE2556354A DE2556354C2 (de) | 1974-12-18 | 1975-12-13 | Digitaler Mehrfrequenzcodezeichenempfänger für Wählkennzeichen in Fernmelde-, insbesondere Fernsprechanlagen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7441711A FR2295665A1 (fr) | 1974-12-18 | 1974-12-18 | Recepteur numerique de signaux multifrequences |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2295665A1 FR2295665A1 (fr) | 1976-07-16 |
FR2295665B1 true FR2295665B1 (is) | 1978-07-13 |
Family
ID=9146325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7441711A Granted FR2295665A1 (fr) | 1974-12-18 | 1974-12-18 | Recepteur numerique de signaux multifrequences |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2556354C2 (is) |
FR (1) | FR2295665A1 (is) |
GB (1) | GB1492310A (is) |
IE (1) | IE42621B1 (is) |
ZA (1) | ZA757642B (is) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2373926A1 (fr) * | 1976-12-10 | 1978-07-07 | Constr Telephoniques | Recepteur de signaux multifrequences |
IT1072242B (it) * | 1976-12-17 | 1985-04-10 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica |
FR2440126A1 (fr) * | 1978-10-27 | 1980-05-23 | Materiel Telephonique | Dispositif et procede de reconnaissance pour recepteur numerique de signaux multifrequences |
NL7903346A (nl) * | 1979-04-27 | 1980-10-29 | Bell Telephone Mfg | Digitaal signaleringsstelsel. |
US4328398A (en) * | 1979-05-22 | 1982-05-04 | Oki Electric Industry Co., Ltd. | Digital multi-frequency receiver |
US4460808A (en) * | 1982-08-23 | 1984-07-17 | At&T Bell Laboratories | Adaptive signal receiving method and apparatus |
DD266253A3 (de) * | 1987-06-22 | 1989-03-29 | Leipzig Rft Nachrichtenelekt | Universeller digitaler mfc-empfaenger |
DE3743755C2 (de) * | 1987-12-23 | 1996-09-05 | Sel Alcatel Ag | Verfahren und Einrichtung zur sicheren Übertragung von Blockinformation zwischen Spurplanstellwerken |
US4833399A (en) * | 1988-06-13 | 1989-05-23 | Texas Instruments Incorporated | DTMF receiver |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1603175A (is) * | 1968-07-30 | 1971-03-22 | ||
US3706076A (en) * | 1970-12-21 | 1972-12-12 | Bell Telephone Labor Inc | Programmable digital filter apparatus |
-
1974
- 1974-12-18 FR FR7441711A patent/FR2295665A1/fr active Granted
-
1975
- 1975-12-02 GB GB49404/75A patent/GB1492310A/en not_active Expired
- 1975-12-05 ZA ZA757642A patent/ZA757642B/xx unknown
- 1975-12-12 IE IE2720/75A patent/IE42621B1/en unknown
- 1975-12-13 DE DE2556354A patent/DE2556354C2/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IE42621L (en) | 1976-06-18 |
DE2556354A1 (de) | 1976-06-24 |
GB1492310A (en) | 1977-11-16 |
DE2556354C2 (de) | 1984-03-08 |
FR2295665A1 (fr) | 1976-07-16 |
IE42621B1 (en) | 1980-09-10 |
ZA757642B (en) | 1976-11-24 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |