Appeal No. 95-2218
Application 07/902,073
discloses. Finding 9, supra. Thus, on reading Fischler and
Pederson, a person having ordinary skill in the art would have
had very strong motivation to combine the teachings of these
references.
4. Fischler's disk drive needs the VFO to implement his
ZBR system. The VFO is an anticipator-synchronized phase-locked
loop. Finding 15, supra. Fischler's VFO is the ZBR analog of
Pederson's window generator, which is a clock-synchronized phase-
locked loop. Finding 11, supra. The person having ordinary
skill in the art would not have needed Pederson's window
generator to implement Pederson's diagnostic system in Fischler's
disk drive because Fischler has its own window generator, the
VFO. Consequently, the person having ordinary skill in the art
would have been motivated to build the following diagnostic
circuit using the VFO:
5. The variable delay means and anticipator would be
coupled in common to the same input because Pederson's detecting
means compares signals from the same source. The VFO in a ZBR
system uses the read data signal, not a clock signal, so the
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