Duplex transmission mechanism for digital telephones
US4598396A · kind A · utility
11Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1984 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Apr 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/547
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A duplex digital transmitter system is disclosed which permits simultaneous digital signal exchange over a two-wire loop. Two sets are provided at the ends of the loop, each having a three-port lattice adapted to separate the transmitted and received digital signals. The digital signals are encoded using a biphase scheme so that they have a zero D.C. component. Therefore the loop is used simultaneously to transmit D.C. power from one set to the other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.