CA1216690A - Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage - Google Patents
Circuit de ligne telephonique a recepteurs dtmf utilises en temps partageInfo
- Publication number
- CA1216690A CA1216690A CA000463919A CA463919A CA1216690A CA 1216690 A CA1216690 A CA 1216690A CA 000463919 A CA000463919 A CA 000463919A CA 463919 A CA463919 A CA 463919A CA 1216690 A CA1216690 A CA 1216690A
- Authority
- CA
- Canada
- Prior art keywords
- receiver
- tone
- dtmf
- signal
- input terminals
- Prior art date
- 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
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/46—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using signals other than revertive impulses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
-
- 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)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000463919A CA1216690A (fr) | 1984-09-25 | 1984-09-25 | Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000463919A CA1216690A (fr) | 1984-09-25 | 1984-09-25 | Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1216690A true CA1216690A (fr) | 1987-01-13 |
Family
ID=4128772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000463919A Expired CA1216690A (fr) | 1984-09-25 | 1984-09-25 | Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA1216690A (fr) |
-
1984
- 1984-09-25 CA CA000463919A patent/CA1216690A/fr not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry |