Tuner
US7343142B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2005 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Aug 18, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B15/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital terrestrial tuner has an RF input connected to a filter arrangement, whose output signal is supplied to a zero intermediate frequency frequency changer. The filter arrangement comprises a plurality of signal paths of different frequency responses. The signal paths are selectable one at a time for insertion between the tuner input and the frequency changer. At least one of the signal paths comprises a non-tracking filter which provides attenuation of out-of-band signals so as to reduce harmonic mixing caused by harmonics of the frequency changer commutating signal or by harmonics of spurious signals at lower frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.