Method and circuit for fetching a 2-D reference picture area fro

Details Method and circuit for fetching a 2-D reference picture area fro Method and circuit for fetching a 2-D reference picture area fro

1995-10-24

1999-05-04

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345511, 345516, 345515, G09G 536

Patent

active

059008652

ABSTRACT:
A structure and a method for providing a video signal encoder under the MPEG-1 and MPEG-2 standards are provided. In one embodiment, a novel scheme for mapping an image to an external memory allows fetching of video data by either field of frame. In addition, an automatic reload of a DMA channel memory allows automatic fetching of an entire 20.times.20 luma reference picture area, or a 12.times.12 chroma reference picture area, while crossing the minimal number of DRAM page boundaries. A novel dequantization instruction in the CPU of the video signal encoder allows efficient oddification of DCT coefficients according to MPEG-1 and MPEG-2 standards.

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