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Interactive home information system    
United States Patent5412720   
Link to this pagehttp://www.wikipatents.com/5412720.html
Inventor(s)Hoarty; W. Leo (Morgan Hill, CA)
AbstractAn interactive cable television system having a plurality of feeder servers, a plurality of home interface controllers and a feeder port. Home interface controllers are each equipped with a radio frequency input and a data communications link with a receiver and transmitter in the feeder port. A node control in communication with the feeder port determines whether a home interface controller is active and then assigns a feeder server to it. The feeder server provides one of a plurality of information signals from a headend depending on a selection input. Digitally compressed video signals are provided at the headend. The digitally compressed video signals can be provided by a modulator means at a carrier frequency greater than the upper frequency limit for carrying analog television signals with acceptable quality on the cable system. The cable television system may make use of a scrambler that maintains the chrome subcarrier on a sync-stripped output signal at all times including the period of vertical retrace. The sync-stripped output signal is modulated at a first carrier frequency and the sync-signal is modulated at a second carrier frequency. A corresponding decoder is provided for receiving scrambled signals and restoring the sync-signal to restore the television signal.
   














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Drawing from US Patent 5412720
Interactive home information system - US Patent 5412720 Drawing
Interactive home information system
Inventor     Hoarty; W. Leo (Morgan Hill, CA)
Owner/Assignee     ICTV, Inc. (Santa Clara, CA)
Patent assignment
All assignments
Publication Date     May 2, 1995
Application Number     07/877,325
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     May 1, 1992
US Classification     380/211 380/212 380/217 380/223 725/1 725/53 725/109 725/119 725/127
Int'l Classification     H04M 007/167
Examiner     Swann; Tod R.
Assistant Examiner    
Attorney/Law Firm     Bromberg & Sunstein
Address
Parent Case     This application is a continuation in part of U.S. application Ser. No. 07/754,932, filed Sep. 10, 1991, now U.S. Pat. No. 5,220,420 which is a continuation in part of U.S. application Ser. No. 07/589,205, filed Sep. 27, 1990, issued as U.S. Pat. No. 5,093,718. These related applications are hereby incorporated herein by reference.
Priority Data    
USPTO Field of Search     380/10 380/15 358/86 455/4.1 455/4.2 455/5.1 455/6.1 455/6.2 348/12 348/13
Patent Tags     interactive home information
   
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 References Submit all comments and votes
 
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Market Size
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$2B - $5B
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Market Share
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50% - 74.99%
25% - 49.99%
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