Multi-standard video decoder
US6833875B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1999 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Sep 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/646
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video decoder for decoding a composite video signal. The decoder includes an analog-to-digital converter (ADC), an input resampler, and a Y/C separator, all coupled in series. The ADC receives and digitizes the composite video signal to generate ADC samples. The input resampler receives and resamples the ADC samples with a first resampling signal to generate resampled video samples. The Y/C separator receives and separates the resampled video samples into luminance and chrominance components. The Y/C separator includes a delay element configured to receive the resampled video samples and provide a variable amount of delay. The variable amount of delay can be adjustable from line to line, and is typically based on an approximated duration of a video line. For an NTSC signal, the variable delay is select to be (m·n+m/2) samples, where m is a ratio of frequencies of the resampling signal and a color subcarrier of the composite video signal, and n is an integer selected such that (m·n+m/2) samples most approximate the duration of a video line. For a PAL signal, the variable delay is selected to be (m·n+3m/4) samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.