Appeal No. 2003-0699 Page 2
Application No. 09/169,724
without regard to the error characteristics of a communication channel, explain the
appellants, fail to provide the error resiliency needed to alleviate the problem. (Spec. at
1.) They add that current schemes for error protection and error recovery waste
bandwidth within the communication channel. (Id. at 2.)
Accordingly, the appellant's video encoder segments a video frame into discrete
spatial components. Each discrete spatial component is then transformed into discrete
frequency components. Components are evaluated to learn the peak number of bits
required for their transmission, and bandwidth is requested as a function of this
determination. The most important components are transmitted first in the requested
bandwidth. Any remaining bandwidth is used to transmit any remaining components.
(Id. at 2-3.)
The appellants' video decoder checks the components it receives for
transmission errors. If any such errors are present, components from a previous
transmission are substituted therefor. According to the appellants, "the[ir] invention
overcomes the noted deficiencies in the prior art by . . . reducing the reliance on error
correction and error recovery schemes that are traditionally used in transmission over
error-prone channels and preventing bandwidth wastage though intelligent bandwidth
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