Digital television signal receiver
US6118499A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 1997 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | May 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A first mixer outputs a TV signal of a first intermediate frequency (the first IF) by up-converting an input signal. A second mixer outputs a TV signal of the second intermediate frequency (the second IF) by down-converting the TV signal of the first IF. The second IF is chosen to be different and below the conventional intermediate frequency used by single super-heterodyne analog TV tuners. By choosing a sufficiently low second IF, the passband signal can be directly sampled by an analog to digital converter after being filtered by a low pass filter. Thus, a digital television broadcast receiver tuner is achieved which can be used with a direct passband sampling type digital demodulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.