Multiple channel upconverter having adjacent channel output and method of implementing the same
US6473593B1 · kind B1 · utility
5Cited by
3References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/165
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An upconverter unit for a cable television system upconverts multiple channel signals from a common intermediate frequency to a VHF or UHF signal ready for transmission to subscribers. The two-stage upconverter provides a first stage in which different channel signals are upconverted to different frequencies which are spaced apart by same frequency difference characteristic of different channels in the cable system. A second stage of the upconverter uses a common oscillator signal to convert the various channel signals from the first stage to the frequencies at which they will be transmitted over the cable system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.