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Method and apparatus for providing on demand services in a subscriber system

  • US 5,631,693 A
  • Filed: 10/25/1993
  • Issued: 05/20/1997
  • Est. Priority Date: 10/25/1993
  • Status: Expired due to Fees
First Claim
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1. An on demand services feature for a subscription system including a plurality of on demand channels which are transmitted over a distribution network to a multiplicity of subscribers, said on demand feature comprising:

  • a source of analog program information wherein the analog program information has a video component and a stereo audio component;

    means for selectively digitizing said analog program information into program data files;

    means for encoding the stereo audio component into a BTSC format signal before the program information is digitized;

    means for storing said program data files in a memory having a library of said program data files;

    means for retrieving a program data file in response to a subscriber request;

    means for converting said retrieved program data file into analog program information wherein said conversion means converts said retrieved program data file into analog program information with a BTSC format stereo audio component; and

    means for modulating said retrieved analog program information onto one of said plurality of on demand channels.

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