Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
US6771667B2 · kind B2 · utility
16Cited by
193References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Feb 26, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A subscriber unit synchronizes to a control channel. An assigned frequency and time slot is transmitted on the control channel to the subscriber unit. The subscriber unit is moved from the control channel to the assigned frequency and time slot. Voice information is received at the subscriber unit. The voice information is digitized and compressed to a lower bit rate. The voice information is transmitted together with an associated control channel from the subscriber unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.