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Multi-user, on-demand video storage and retrieval system including video signature computation for preventing excessive instantaneous server data rate

  • US 5,519,435 A
  • Filed: 09/01/1994
  • Issued: 05/21/1996
  • Est. Priority Date: 09/01/1994
  • Status: Expired due to Term
First Claim
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1. A data storage and retrieval system, comprising:

  • a storage for storing a plurality of digital data files;

    a plurality of processors for concurrently processing data files transmitted thereto from the storage;

    a server for concurrently retrieving selected data files from the storage and transmitting said selected data files to selected processors respectively;

    a memory for storing one temporal instantaneous digital data rate signature for each of said data files respectively; and

    a computer that is programmed to perform the steps of;

    (a) computing a current composite signature by summing said signatures for said selected data files respectively;

    (b) when an additional data file is selected for retrieval and transmittal, computing a new composite signature by summing a new signature constituted by said signature for said additional data file with said current composite signature;

    (c) comparing said new composite signature with a predetermined maximum data rate criteria;

    (d) if said new composite signature satisfies said criteria, controlling the server to retrieve and transmit said additional data file; and

    (e) if said new composite signature does not satisfy said criteria, computing a shifted signature by temporally shifting said new signature forward by a predetermined time increment, recomputing said new composite signature by summing said shifted signature with said current composite signature and jumping to step (c).

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