Electrical computers and digital processing systems: support – Synchronization of clock or timing signals – data – or pulses
Reexamination Certificate
2011-08-09
2011-08-09
Lee, Thomas (Department: 2116)
Electrical computers and digital processing systems: support
Synchronization of clock or timing signals, data, or pulses
C713S500000, C713S503000, C713S600000, C348S497000, C348S500000, C348S513000
Reexamination Certificate
active
07996699
ABSTRACT:
Multiple media devices are synchronized in a multi-media system having a computer system, a plurality of media devices, and a display system. Each media device to be synchronized receives a front-end synchronization signal that periodically increments a front-end counter. The front-end counter represents an unadjusted system time (UST). The media device obtains a frame of data to be displayed from a computer system. The media device also receives a back-end synchronization signal that periodically increments a back-end counter each time a frame of data is to be displayed. The back-end counter represents a media stream count (MSC). UST and MSC data are periodically transmitted to the computer system for analysis and use by a synchronization algorithm. Specifically, UST is transmitted to the computer system each time a frame of data is obtained, and a UST/MSC pair is transmitted to the computer system each time a frame of data is displayed. The computer system executes a synchronization algorithm that uses the transmitted UST and UST/MSC pair to maintain the media devices in a synchronized state.
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Pirazzi, Chris, “Introduction to UST and UST/MSC,” Lurker's Guide, http://lurkertech.com/lg/time/intro.html, last updated Mar. 1, 2002, 54 pgs.
Bernard Francis S.
Lawson William R.
Poimboeuf Michael K.
Smith Kevin A.
Stock Todd S.
Brown Michael J
Graphics Properties Holdings, Inc.
Lee Thomas
Sterne Kessler Goldstein & Fox PLLC
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