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Compressed digital data interactive program system    
United States Patent5724091   
Link to this pagehttp://www.wikipatents.com/5724091.html
Inventor(s)Freeman; Michael J. (Kings Point, NY); Harper; Gregory W. (New York, NY)
AbstractAn interactive cable television system is disclosed which utilizes a standard cable television distribution network for simultaneously providing a plurality of viewers with an interactive television program comprising a plurality of signals related in time and content. Video signals are transmitted in a digital format, more than one signal being multiplexed onto a data stream on a single channel. The video signals may be compressed for efficiency. A receiver, in conjunction with a signal selector, selects a particular NTSC channel for playback, then selects a particular video signal from the data stream, and decompresses the video signal for playback. Seamless switching between video signals on different channels is provided. An alternative embodiment is disclosed wherein the various signals which comprise the interactive program are switched at the head end rather than at the receiver. The multiple choice control unit selects a desired signal by relaying the multiple choice selections of the user through a relay box back to a remotely located switching station. The switching station routes the correct video signal down the appropriate cable channel for the particular user.
   














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Drawing from US Patent 5724091
Compressed digital data interactive program system - US Patent 5724091 Drawing
Compressed digital data interactive program system
Inventor     Freeman; Michael J. (Kings Point, NY); Harper; Gregory W. (New York, NY)
Owner/Assignee     ACTV, Inc. (New York, NY)
Patent assignment
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Publication Date     March 3, 1998
Application Number     08/443,607
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     May 18, 1995
US Classification     725/138 725/114 725/131 725/139
Int'l Classification     H04N 007/173
Examiner     Peng; John K.
Assistant Examiner     Flynn; Nathan J..
Attorney/Law Firm     Dorsey & Whitney LLP
Address
Parent Case     CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of application Ser. No. 08,166,608, filed Dec. 13, 1993, entitled COMPRESSED DIGITAL-DATA INTERACTIVE TELEVISION SYSTEM, now abandoned which is a continuation of application Ser. No. 07/797,298, filed Nov. 25, 1991, now abandoned.
Priority Data    
USPTO Field of Search     348/6 348/7 348/8 348/9 348/10 348/12 348/13 348/14 348/15 348/16 348/17 348/725 348/726 455/2 455/3.1 455/3.3 455/4.1 455/4.2 455/5.1 455/6.1 455/6.2 455/6.3
Patent Tags     compressed digital data interactive program
   
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