MPEG decoding with a reduced RAM requisite by ADPCM recompression before storing MPEG decompressed data, optionally after a subsampling algorithm
US5986711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The video memory requisite of an MPEG decoder effecting a decompression of the I, P and optionally also of the B picture according to the MPEG compression algorithm and requiring the storing in respective buffers organized in said video memory of the respective MPEG-decompressed data, may be dynamically reduced by subsampling and recompressing according to a ADPCM algorithm of at least the data pertaining to the I and P pictures before coding and storing them in the respective buffers. Subsequently, the stored data are decoded, decompressed and upsampled for reconstructing blocks of pels to be sent to a macroblock-to-raster scan conversion circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.