Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-09-06
1985-11-12
George, Keith E.
Facsimile and static presentation processing
Static presentation processing
Attribute control
455 5, H04N 710, H04N 714
Patent
active
045531617
ABSTRACT:
Synchronization of upstream data packet time slots with the vertical blanking interval (VBI) of a video signal transmitted downstream from the headend is provided in a two-way cable television (CATV) system. Coded data transmitted during a designated VBI line from the CATV headend is compared with system data stored in each subscriber terminal for generating a match signal. The match signal is used to interrupt a microcomputer which then divides the next video signal raster scan field into 8 equal time slots during any one of which an upsteam data packet may be transmitted. Upstream data is thus accurately synchronized with a downstream vertical scan rate signal in reducing the likelihood of collisions between upstream data packets and increasing through-put in a two-way CATV system.
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George Keith E.
Zenith Electronics Corporation
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