Device for writing and reading of size reduced video on a video screen by fixing read and write of alternating field memories during resize operation
US5963221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1996 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Oct 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0407
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An input video signal is reduced according to size reduction ratio data K in an input processing section and written into alternate field memories. The written reduced video signal is alternately read from the field memories in a display processing section and processed for window displaying. Video reduction control sections are provided on the respective input and display sides, so that various signals, such as RHOLD, ADCANS, RACK signals, etc., are exchanged therebetween. When a size reduction ratio data K is changed, on the display side a read memory is fixed on a first field memory and size data is fixed, while on the write side video data is written into a second field memory, based on the new reduction ratio. After updating the size data on the display side, video data is read from the second field memory at the new reduction ratio. When reading and writing operations with respect to the second field memory are finished, fixing of the respective memories is released, whereby a signal processing operation returns to a normal operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.