Apparatus for processing mixed yuv and color palettized video signals

Abstract

Apparatus processes mixed YUV and color palettized video signals for display on an interlaced NTSC or television receiver by storing first and second fields of one or more sprites in a graphic memory. Each sprite is stored as YUV or color palettized data and given a priority. A higher priority sprite overwrites pixel data of sprites of a lower priority when sprites overlap. First and second adjacent horizontal lines of pixel data in the first and second fields, respectively, are concurrently stored in respective first and second double buffers of a pixel assembly buffer during each line period. A delay buffer and the first and second double buffers generate first, second, and third adjacent horizontal lines, respectively, of pixel data at the output of the pixel assembly buffer while third and fourth adjacent horizontal lines of pixel data are inputted to the first and second double buffers. A convolving means receives the first, second, and third output signals from the pixel assembly buffer and generates therefrom an output signal providing a weighted average for a central pixel of a predetermined matrix of pixel data for transmission to the television receiver when a sprite is included in a pixel area of the television receiver. A live video signal is transmitted to the display of the television receiver when no sprite is included in a pixel area of the television receiver.