Appeal No. 1997-2380
Application No. 08/121,809
According to the examiner (Answer, pages 3 and 4),
“adaptive thresholding is well known in the art as disclosed
by Fletcher
et al.” Although “Fletcher in the discussion of a telemetry
synchronizer discussed changing modes depending upon the
number of good frames or bad frames of data received (see
abstract and columns 6-7)” (Answer, page 4), Fletcher’s modes
(i.e., lock, verify and search) (Figure 1; column 6, line 67
through column 7, line 13) do not include erasure of a frame
of information. During the mode changes, only one threshold
value (i.e., the output from threshold detector 34) is used by
Fletcher, and the Fletcher telemetry synchronizer never
switches from one threshold value to another threshold value.
In other words, the other threshold detector 15 in Fletcher
(Figure 1) is not used in conjunction with the threshold
detector 34 to form two threshold values that are switched in
and out of the synchronizer system based upon bad frame
erasure/mode changes.
We agree with appellants’ argument (Brief, pages 7 and 8)
that the claimed first and second bit correction “thresholds
used to make the determination of whether a frame of
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