Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference
US4979230A · kind A · utility
61Cited by
8References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Dec 4, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A carrier is received containing a plurality of signals within a first frequency band, for example television signals within the cable television band. The signals are upconverted to a second frequency band above the first band wherein a selected one of the upconverted signals will reside at an intermediate frequency within the second band. The selected upconverted signal is input to a homodyne detector operating at or near intermediate frequency. In-phase and quadrature signals output from the homodyne detector are digitally processed to recover a baseband signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.