Data processing technique for limiting the bandwidth of data to be stored in a buffer
US5463422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1993 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The bandwidth capability of a full-motion video buffer is prevented from being exceeded by automatically controlling the horizontal scaling of the incoming video data and the horizontal zooming or expansion of the outgoing display data to force the bandwidth of the video data to virtually match the bandwidth capability of the video buffer. In one embodiment, this automatic control of the horizontal scaling and zooming is performed in a dynamic fashion where a detector detects the dropping of any video bits caused by the bandwidth of the incoming video data exceeding the bandwidth capability of the video buffer. Upon detection of these dropped bits, the horizontal scaling of the incoming video data is incrementally reduced (and the horizontal zooming is proportionally increased) until the bandwidth of the incoming video data is at or below the maximum bandwidth capability of the memory buffer. In this way, the video buffer cannot be overdriven and no video data is lost. This technique also applies to processing non-video data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.