FR2268406B1 - - Google Patents
Info
- Publication number
- FR2268406B1 FR2268406B1 FR7413137A FR7413137A FR2268406B1 FR 2268406 B1 FR2268406 B1 FR 2268406B1 FR 7413137 A FR7413137 A FR 7413137A FR 7413137 A FR7413137 A FR 7413137A FR 2268406 B1 FR2268406 B1 FR 2268406B1
- 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
- H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7413137A FR2268406A1 (en) | 1974-04-16 | 1974-04-16 | Double frequency telephone signalling - recognises signal for set frequency voltage relationship |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7413137A FR2268406A1 (en) | 1974-04-16 | 1974-04-16 | Double frequency telephone signalling - recognises signal for set frequency voltage relationship |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2268406A1 FR2268406A1 (en) | 1975-11-14 |
FR2268406B1 true FR2268406B1 (sv) | 1976-12-17 |
Family
ID=9137657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7413137A Granted FR2268406A1 (en) | 1974-04-16 | 1974-04-16 | Double frequency telephone signalling - recognises signal for set frequency voltage relationship |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2268406A1 (sv) |
-
1974
- 1974-04-16 FR FR7413137A patent/FR2268406A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2268406A1 (en) | 1975-11-14 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |