ZA757642B - Digital multifrequency signals receiver - Google Patents
Digital multifrequency signals receiverInfo
- Publication number
- ZA757642B ZA757642B ZA757642A ZA757642A ZA757642B ZA 757642 B ZA757642 B ZA 757642B ZA 757642 A ZA757642 A ZA 757642A ZA 757642 A ZA757642 A ZA 757642A ZA 757642 B ZA757642 B ZA 757642B
- Authority
- ZA
- South Africa
- Prior art keywords
- signals receiver
- multifrequency signals
- digital multifrequency
- digital
- receiver
- Prior art date
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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7441711A FR2295665A1 (en) | 1974-12-18 | 1974-12-18 | MULTI-FREQUENCY DIGITAL SIGNAL RECEIVER |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA757642B true ZA757642B (en) | 1976-11-24 |
Family
ID=9146325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA757642A ZA757642B (en) | 1974-12-18 | 1975-12-05 | Digital multifrequency signals receiver |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2556354C2 (en) |
FR (1) | FR2295665A1 (en) |
GB (1) | GB1492310A (en) |
IE (1) | IE42621B1 (en) |
ZA (1) | ZA757642B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2373926A1 (en) * | 1976-12-10 | 1978-07-07 | Constr Telephoniques | MULTI-FREQUENCY SIGNAL RECEIVER |
IT1072242B (en) * | 1976-12-17 | 1985-04-10 | Cselt Centro Studi Lab Telecom | PROCEDURE AND DEVICE FOR THE RECOGNITION OF TELEPHONE SIGNALS IN MULTIFREQUENCY CODE CONVERTED IN NUMERICAL FORM |
FR2440126A1 (en) * | 1978-10-27 | 1980-05-23 | Materiel Telephonique | RECOGNITION DEVICE AND METHOD FOR A DIGITAL MULTI-FREQUENCY SIGNAL RECEIVER |
NL7903346A (en) * | 1979-04-27 | 1980-10-29 | Bell Telephone Mfg | DIGITAL SIGNALING SYSTEM. |
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 (en) * | 1987-06-22 | 1989-03-29 | Leipzig Rft Nachrichtenelekt | UNIVERSAL DIGITAL MFC RECEPTIONER |
DE3743755C2 (en) * | 1987-12-23 | 1996-09-05 | Sel Alcatel Ag | Method and device for the secure transmission of block information between track interlockings |
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 (en) * | 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/en active Granted
-
1975
- 1975-12-02 GB GB49404/75A patent/GB1492310A/en not_active Expired
- 1975-12-05 ZA ZA757642A patent/ZA757642B/en unknown
- 1975-12-12 IE IE2720/75A patent/IE42621B1/en unknown
- 1975-12-13 DE DE2556354A patent/DE2556354C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IE42621L (en) | 1976-06-18 |
DE2556354A1 (en) | 1976-06-24 |
GB1492310A (en) | 1977-11-16 |
DE2556354C2 (en) | 1984-03-08 |
FR2295665A1 (en) | 1976-07-16 |
FR2295665B1 (en) | 1978-07-13 |
IE42621B1 (en) | 1980-09-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU4168578A (en) | Encoded multifrequency digital signal receiver | |
AU8338475A (en) | Signal coding for telephone communication system | |
JPS5255313A (en) | Facsimile signal coding system | |
SE402849B (en) | MULTIFREQUENCY SIGNAL RECEIVER | |
CA1004785A (en) | Multifrequency signal receiver | |
JPS5253613A (en) | Digital repeater | |
JPS5255312A (en) | Facsimile signal coding system | |
CA1003140A (en) | Digital dial pulse receiver | |
CA961184A (en) | Audio multifrequency signal receiver | |
ZA757642B (en) | Digital multifrequency signals receiver | |
JPS51112159A (en) | Digital noise discriminator | |
IL47017A0 (en) | Digital tacan system | |
ZA754275B (en) | Digital signal transmission | |
JPS51114011A (en) | Digital communication system | |
CA1035879A (en) | Multifrequency signal receiver timing circuit | |
GB1547395A (en) | Signal receiver | |
AU7094474A (en) | Television receiver | |
JPS5229245A (en) | Radio transmission type digital seismic signal recorder | |
CA1009314A (en) | Digital multifrequency signal generator | |
CA1034210A (en) | Multifrequency tone detection | |
JPS5292416A (en) | Digital communication system | |
JPS532017A (en) | Fm digital signal receiver | |
JPS5275111A (en) | Facsimile signal coding system | |
JPS5277644A (en) | Digital signal processor | |
US4009440A (en) | Radio receiver |