Appeal No. 1999-2018
Application 08/571,204
subtractor 21 and generally corresponds to Appellant's
bidirectional prediction error which is a function of Ef and
Eb (specification, p. 25) except that the sum is weighted
depending on the distance in terms of time (the closer frame
is more heavily weighted, col. 3, lines 7-12; col. 11,
lines 1-6). The output of 29 is biased by subtractor 36 to
favor the bidirectional mode. The output of cumulative
adder 31 in Fig. 4 is the sum of error-squared values of the
current frame values with the DC component of the signal
removed and generally corresponds to Appellant's Eintra,
Eqn. 3, where the DC component corresponds to Aav, except it
is the sum of the difference squared rather than the sum of
the absolute value of the difference. The output of 31 is
biased by adder 37 to prevent the intra mode from being
selected with high probability (col. 13, lines 26-36).
The minimum value selector 32 in Fig. 4 determines
which of these summed error-squared values has the lowest
value and outputs a signal to select one of three predictive
coding modes and one intra coding mode (col. 6, line 61 to
col. 7, line 6; col. 10, lines 19-37; col. 12, lines 42-68):
(1) Option 1 (Mode 1), bidirectionally predictive mode;
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