Appeal 2006-2328
Application 10/131,049
replacement sync signal where the problem of missing input sync signals may
occur for the described advantage in Yamagishi of allowing subsequent
circuit stages to operate without halting. Thus, one of ordinary skill in the art
would have been motivated to modify Arai to provide for the microcomputer
generating replacement reference vertical and horizontal synchronous signals
when such sync signals were detected as missing. This is separate problem
from the problem solved by the H-omission countermeasure circuit.
It is true that Arai does not describe the problem of missing horizontal
and vertical synchronous signals from the computer, but obviousness is
judged through the eyes of the hypothetical person of ordinary skill in the art
who has constructive knowledge of all references in an inventor's field of
endeavor or reasonably pertinent to the problem facing the inventor. Here,
Yamagishi teaches that the inventor's problem of missing input sync signals
was known in the art and teaches the solution of generating replacement
reference sync signals. One of ordinary skill in the video art had sufficient
skill to recognize that synchronizing signals can be missing in Arai and would
have been motivated apply the teachings of Yamagishi to Arai to overcome
the problem of missing sync signals. Motivation is found in the teachings of
Yamagishi and in the knowledge of persons of ordinary skill in the art.
Appellant's argument that one skilled in the art would have understood
that if both the horizontal and vertical synchronizing signals are not detected
in Arai, then it is unlikely that the computer is supplying a video signal, and
that there would be no motivation to generate reference horizontal and
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