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Digital broadcast system having transmission apparatus and receiving apparatus

  • US 7,286,601 B2
  • Filed: 08/14/2003
  • Issued: 10/23/2007
  • Est. Priority Date: 08/27/2002
  • Status: Active Grant
First Claim
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1. A broadcast system including a transmission apparatus and a receiving apparatus, the transmission apparatus including:

  • a generating unit operable to generate a first digital stream and a second digital stream by encoding a same signal at different encoding bit rates, where an encoding bit rate for the first digital stream is lower than an encoding bit rate for the second digital stream; and

    a transmission unit operable to transmit the first and second digital streams onto a transmission path while delaying the second digital stream relative to the first digital stream,the receiving apparatus including;

    a reproduction unit operable to reproduce the second digital stream in a normal state;

    a reproduction control unit operable to, when a transmission path failure occurs, cause the reproduction unit to reproduce, instead of the second digital stream, a portion of the first digital stream that has been received before the occurrence of the transmission path failure;

    a receiving unit operable to receive packets constituting the first and second digital streams for each digital stream;

    an accumulating unit operable to accumulate one or more packets of the first digital stream received by the receiving unit during a predetermined time period until a current time, whereinthe predetermined time period is determined based on statistics of a time period for which a transmission path failure continues, andthe reproduction control unit causes the reproduction unit to reproduce the one or more packets of the first digital stream accumulated in the accumulating unit, when a transmission path failure occurs; and

    a write control unit operable to, each time the receiving unit newly receives a packet, write the newly received packet into the accumulating unit after deleting an oldest packet among the one or more packets accumulated in the accumulating unit.

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