Appeal No. 96-2696
Application 08/167,415
No. 07/789,245, filed Nov. 7, 1991 and entitled
"Apparatus For Concealing Errors In A Digital Video
Processing System." In this system the FCS decoder
generates error tokens which indicate when data has been
discarded. Responsive to the error tokens the system
substitutes predetermined sequences of compressed data
for discarded data. The data is then decompressed for
display or storage purposes. Depending upon the type of
data that is lost, replacement by synthesized compressed
data may not produce satisfactory images. [Col. 1, line
31 to col. 2, line 5.]
In accordance with Sun's invention,
[w]hen an image area is identified with data that has
been discarded, adjacent decompressed image areas are
examined for motion and detail. Depending upon the
relative amount of motion or detail in adjacent image
areas, the current image area is replaced with spatially
synthesized or temporally co-located data respectively.
[Col. 2, lines 13-19.]
The examiner contends that the term "invalid code" as used in
appellants' claims is a very broad term and that
[a]ny non-information data appended to the information
data packet can be considered as "invalid code". For
instance, forward error correction code (FEC), frame
check sequence code (FCS), and synchronization code,
which are all packed as part of a header code or
transport packet, to perform error correction, redundancy
check and synchronization respectively, are effectively
removed at the receiving side during decompression (see
col. 4, lines 67-68). [Answer at 7.]
We agree with appellants that the examiner's broad
construction of "invalid code" ignores the fact that the
claims specify that the invalid code is used to prevent the
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