Patent ID: 7286601
Filing Date: 2007-10-23
Classification: G10L,H04H,H04N

Abstract:
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, wherein the predetermined time period is determined based on statistics of a time period for which a transmission path failure continues, and the 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.