Lateral image reversal of digital television signals
US5629741A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1992 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Feb 5, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Each line of a television signal has a sequence of interleaved luminance and chrominance samples according to a given format (Y.sub.o U.sub.o Y.sub.1 V.sub.o etc.) which are written into a one line store using a first address sequence and then read out using a second address sequence such that the luminance samples are in reverse order, (and likewise the chrominance); however their interleaving conforms to the given format. The second address sequence is used also for writing in the next incoming line, which is then read out using the first sequence, the two sequences alternating throughout a field period. The technique is especially useful in videotelephony and videoconferencing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.