Method and apparatus for addressing beat patterns in an...

Details Method and apparatus for addressing beat patterns in an... Method and apparatus for addressing beat patterns in an...

2005-03-29

2005-03-29

Liang, Regina (Department: 2674)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S213000

Reexamination Certificate

active

06873318

ABSTRACT:
Disclosed is a video data re-clocking scheme for use in highly integrated system circuits to overcome the problem of beat patterns. These type of circuits contain many subsystem blocks, and each of those blocks may use different clock frequencies. Due to implementation constraints, clock interferences from nearby blocks are unavoidable. In a video display sub-system, these interferences produce beat patterns that substantially degrade video quality. One disclosed embodiment of the invention employs re-clocking flips-flops to re-time the input signals feeding the video Red/Green/Blue Digital-to-Analog converters (RGB DACs) such that data edge jitters due to interference are removed. The resulting picture quality is free of beat patterns.

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