Appeal No. 2002-1961
Application No. 09/133,430 Page 8
the signal from the subtracting circuit (col. 2, line 62 through
col. 3, line 13). 106 shows a discrimination circuit which
compares an efficiency of encoding the video signal of the
present frame with an efficiency of encoding the predictive video
signal to select one of them as the signal to be encoded. 107
shows a control circuit for a refresh operation (col. 3, lines
4-8). 108 shows an OR circuit to which a discrimination result
from discrimination circuit 106 and a refresh signal from control
circuit 107 are supplied. 109 shows an orthogonal transformation
circuit for orthogonally transforming a signal selected by
switching circuit 105. 118 shows a switching circuit which
selects either terminal a or b in response to an output of OR
circuit 108, and connects to switching circuit 105 (col. 3, lines
14-18 and 32-34).
In operation, the signal produced by block dividing circuit
103 is supplied to the subtracting circuit 104, terminal (a) of
switching circuit 105, and discrimination circuit 106. The
predictive signal from motion compensating circuit 121 is also
supplied to subtracting circuit 104. The subtracting circuit 104
calculates difference values from the predictive signal output
from the motion compensating circuit and the signal of the
present frame processed through block dividing circuit 103, and
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Last modified: November 3, 2007