Graphics display system with anti-flutter filtering and vertical scaling feature

Abstract

A graphics integrated circuit chip is used in a set-top box for controlling a television display. The graphics chip processes analog video input, digital video input, and graphics input. The chip includes a single polyphase filter that preferably provides both anti-flutter filtering and scaling of graphics. Anti-flutter filtering may help reduce display flicker due to the interlaced nature of television displays. The scaling of graphics may be used to convert the normally square pixel aspect ratio of graphics to the normally rectangular pixel aspect ratio of video.

1 - 14 . (canceled) 
   
   
       15 . A graphics filter comprising:
 means for scaling graphics; and   means for performing anti-flutter filtering, wherein the means for performing anti-flutter filtering is the same as the means for scaling graphics.