US Patent No: 4,553,161

Number of patents in Portfolio can not be more than 2000

Upstream data packet time slot synchronization with downstream VBI for two-way CATV system

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Importance

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ZENITH ELECTRONICS CORPORATIONGLENVIEW, IL920

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Citta, Richard W Oak Park, IL 155 2941

Cited Art

Patent Info (Count) # Cites Year
 
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PIONEER ELECTRONIC CORPORATION (1)
4,454,538 Data communication in CATV system 92 1982

Patent Citation Ranking

Forward Cites

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