Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-04-21
1993-11-16
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 395163, 3642706, 345213, H04N 506, H04N 504
Patent
active
052628612
ABSTRACT:
A self-contained, computer controllable, video synchronization and frame pulse signal generator for generating a video synchronization signal, such as video black burst, and a video frame pulse signal indicating the presence of a video signal frame. The present invention can be connected as a subsystem within an existing personal computer having an open architecture (e.g., as a plug-in interface board in a PC-AT.RTM.). The video synchronization signal is useful as a master synchronization signal source within a video signal processing system (e.g., an off-line video editing system). The video frame pulse signal is synchronized to the video synchronization signal and can be selectively gated under computer control to produce an interrupt signal useful as a stimulus for a computer's software interrupt routines within a video signal processing system. In an alternative embodiment, computer controllable switches are included for programmably selecting among additional video synchronization and frame pulse signals (e.g., NTSC, PAL, SECAM or HDTV), which can be generated either internally or externally. The selected video synchronization and frame pulse signals are used as the master synchronization signal source and interrupt signal, respectively.
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Groody James J.
Metjahic Safet
Sony Electronics Inc.
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