Appeal No. 96-2696
Application 08/167,415
converter with invalid code generated by macro block invalid
code generating circuit 123 (Spec. at 15, lines 2-6). The
controller 124
controls the multiplexer 122 corresponding to the send
buffer information and selects, when the send buffer 7
does not generate [an] underflow condition, an output of
the N/M converter 121 or selects an invalid code
outputted from the macroblock invalid code generating
circuit 123 when the send buffer 7 is supposed to
generate [an] underflow condition. Therefore, the data
outputted from the multiplexer 122 mixes invalid codes of
the desired number of units. [Spec. at 15, lines 12-20).
Thus, an underflow condition sensed in send buffer 7 is
corrected by inserting invalid codes into the output data
stream provided by the send buffer.
Figures 6(A) and 6(B) show a prior art decoding apparatus
for decoding the data generated by the encoding apparatus of
Figures 1(A)-(C) (Spec. at 15, lines 21-24). The received
encoded data is temporarily stored in receiving buffer 32 and
then supplied to a variable length decoding circuit 33, the
output of which is processed by inverse quantizing circuit 34
and then IDCT circuit 35 (Spec. at 15, last line to p. 16,
line 22). The variable length decoding circuit 33 removes any
invalid codes inserted by the encoding apparatus at the
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Last modified: November 3, 2007