Multi-standard TV receiver with luma/chroma delay compensation
US5374962A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1994 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Mar 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A composite video input signal is delayed by a delay element and the delayed composite signal is applied to luminance and chrominance inputs of a picture processor for received signals of an NTSC format. For received signals of a format, the delayed composite signal is applied only to the luminance input of the picture processor and the chrominance component of the received signal is transcoded to the NTSC format and applied, without passing through the composite signal delay element, to the chrominance input of the picture processor. The delay of the delay element for the composite video signal is selected to be equal to the transcoding delay whereby luminance and chrominance components of received signals of either NTSC or format are delay compensated. Advantageously, the delay applied to the luminance component is constant and of the same value for signals of either format and so there is no need for switching of delay elements in the luminance path when changing from one format to the other and so undesirable switching artifacts (e.g., DC offset or transient effects) are avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.