Digital video signal processing with cut editing feature
US4891715A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of and apparatus for processing a digital video signal to effect cut editing is disclosed. The method comprises storing a segment of an input digital video signal in a random access memory, the digital video signal being repetitively written in the memory at a standard speed, writing proceeding cyclically from the start of the memory to the finish of the memory, then returning to the start of the memory, and reading the digital video signal from the memory at the standard speed, the reading normally lagging behind writing by an amount substantially equal to the capacity of the memory, which may be several seconds. The read digital video signal is cut edited by step reducing the amount by which reading lags behind writing, and subsequent to a cut edit the reading speed is reduced below the standard speed until the amount by which reading lags behind writing is restored to the normal amount. The read digital video signal is supplied to interpolation filters to restore the frame frequency of the read digital video signal to the frame frequency corresponding to the standard speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.