Appeal No. 96-2696
Application 08/167,415
transmitting end (Spec. at 19, lines 15-21). However, the
following discontinuity problem results:
[W]hile the invalid code is being removed in the variable
length decoding circuit 33, data is not supplied to each
circuit after the inverse quantizing circuit 34 in the
successive stages, bringing about a disadvantage that
these circuits are not used for the processing. In the
case of the NTSC system, an image of one frame is
displayed on the display[] 40 in the period of 1/30
second. But, if the invalid code is long, each circuit
after the inverse quantizing circuit 34 cannot process
the data of one frame within the period of 1/30 second
and display of [an] image on the display 40 has been
discontinued. [Spec. at 19, line 22 to p. 20, line 9.]
We understand this passage to mean that the time it takes for
the variable length decoder to eliminate a long series of
invalid codes from the transmitted data stream causes a
discontinuity in the displayed image.
Appellants' invention
Appellants avoid the foregoing discontinuity problem by
removing invalid codes from the received encoded image data
before it reaches receiving buffer 32 and variable length
encoding circuit 33 (Spec. at 20, line 11 to p. 21, line 9).
This is accomplished by using the invalid code format shown in
Figure 9 for a macroblock (Spec. at sentence bridging pp. 25
and 26). This code format, which is referred to in the
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