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....http://www.google.com.hk/patents/US6738072?utm_source=gb-gplus-share專利 US6738072 - Graphics display system with anti-flutter filtering and vertical scaling feature
