Two wire voice and data subscriber loop
US4608686A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1982 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Sep 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit for transmitting both voice and data at the same time between a subscriber's set and a switching exchange via a bidirectional two wire link. The invention is comprised of a subscriber's set adapted to generate and receive baseband voice signals and data signals, a circuit for 100% amplitude modulating the generated data signal on a carrier signal having its lowest sideband after filtering above the voice signal base band, a circuit for applying the voice signals and modulated carrier to a two-wire subscriber's line, a circuit for separating the voice signals and modulated carrier, and a circuit for demodulating the digital signal and applying the digital signal to control circuits of a switching exchange. Voice signals are applied to voice handling circuits such as the voice switching circuits of the switching machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.