Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1996-09-12
1998-08-04
Saras, Steven
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
348513, G09G 500, H04N 505
Patent
active
057901139
ABSTRACT:
The present invention is a means and method for synchronizing closed free-running systems, such as graphics systems, with no external synchronization signals required. Video games and most computer display controllers are closed free-running systems. Because most such systems have the means to switch between an interlaced and non-interlaced operation, and because interlaced and non-interlaced modes have a relative timing variation, the timing between two or more such closed free-running systems can be synchronized. This method allows synchronization with an imprecise timing reference. The vertical display timing is the free-running oscillator and the interlaced
on-interlaced mode transition is used as the timing adjustment means. The actual arrival time of data in a communication medium connecting two systems being synchronized is used in relation to an expected arrival time to provide the clock reference.
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Perlman Stephen G.
Roskowski Steven G.
Catapult Entertainment
Saras Steven
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