Telephone circuit
US4360710A · kind A · utility
13Cited by
1References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1980 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Sep 25, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/312
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Telephone circuit using a transconductance switch in a high current line with the voice network, and a dial network in a low current line with the control input of the switch to provide dial input signals at the control input and send dial pulse signalling along the high current line through the voice network. The voice network includes a current clamp to stabilize the high current through the switch to the voice network sufficiently quickly to establish the desired waveform during dialling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.