Digital subchannel transceiver for transmitting data
US7664142B2 · kind B2 · utility
1Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2003 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Aug 8, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4908
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for transmitting subchannel data over the same media as high speed data, especially DC balanced high speed data. A digital transmitter receives subchannel data and modulates it onto a subchannel carrier as the host signal in the preferred embodiment using frequency shift keying. The FSK subchannel carrier is added by superposition to the high speed data signal. Because of the ability to have very narrow bandwidths for the passbands of digital IF filters, the receiver is more sensitive and less susceptible to the need for tuning to accommodate manufacturing variations in the rise times of the high speed data signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.