Digital conference bridge
US3970797A · kind A · utility
11Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jan 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/568
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A Digital/analog conference arrangement for up to M (15) digital subscribers. The digital signals are sensed, and up to N (3) are converted at the same time to analog signals which are processed in an analog bridge, then converted to digital signals which are transmitted to the appropriate subscribers. The voice signals of each subscriber are encoded by the continuously variable slope delta modulation (CVSD) technique into a serial digital bit stream, which are time-multiplexed into 15 input channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.