Appeal 2006-2328
Application 10/131,049
synchronous signal and reference vertical synchronous signal would be
a waste of energy if there is no video signal to be displayed.
Analysis
We find that Arai discloses "a microcomputer connected to a vertical
synchronous signal terminal, a horizontal/composite synchronous signal
terminal and a synchronous-on-green terminal of said computer to detect
inputs of said horizontal and vertical synchronous signals from said
computer," as recited in claim 26, as discussed in connection with the
"microcomputer" limitation of claim 58. Arai does not teach that the
microcomputer generates "reference horizontal and vertical synchronous
signals when no input is received from [the three input terminals]."
Yamagishi provides a general teaching of supplying a replacement
"reference" synchronizing signal (INT. Sync) when a selected synchronizing
signal (Input Sync or EXT. Sync) is detected as missing for the advantage of
allowing subsequent circuit stages to continue to operate. One of ordinary
skill in the art would have been motivated to look to the art containing
Yamagishi to solve the problem of missing sync signals. See Cross v.
Medtronic, 424 F.3d at 1322, 76 USPQ2d at 1684-85 ("Evidence that a
person of ordinary skill in the art recognized the same problem to be solved as
the inventor and suggested a solution is, at the least, probative of a person of
ordinary skill in the art's willingness to search the prior art in the same field
for a suggestion on how to solve that problem."). One of ordinary skill in the
art would have been motivated to apply Yamagishi's solution of generating a
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