Simultaneous analog and digital communication
US5661718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | May 30, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4382
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for concurrent communication of analog information and digital information. In general terms, when the communication channel is viewed as a multi-dimensional space, the digital information signal is divided into symbols, and the symbols are mapped onto the signal space with a preset distance between them. The analog signal, generally limited in magnitude to less than the distance separating the symbols, is converted to component signals and added (i.e., vector addition) to the symbols. The sum signal is then transmitted to the receiver where the symbols are detected and subtracted from the received signal to yield the analog signal components. The transmitted analog signal is recreated from those components. Both half-duplex and full-duplex operation is available in accordance with the disclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.