Analog-to-digital converter as for an adaptive television deghosting system
US4686570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1985 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Dec 24, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/211
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital television signal deghosting system includes an IIR filter responsive to the in-phase and quadrature-phase components of modulated television signals for cancelling ghost signals irrespective of their phase. A double-conversion tuner develops modulated composite video signals having a 3f.sub.c carrier frequency. An analog-to-digital converter responsive to a two-phase 3f.sub.c clock signal develops digital samples which alternately represent the baseband in-phase and quadrature-phase components of the modulated video signals. These samples are separated to develop digital signals representing the in-phase and quadrature-phase components of the modulated television signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.