Appeal 2006-2328
Application 10/131,049
internal synchronizing signal INT. (Internal) Sync when the selected
Input Sync or EXT. Sync signal is missing. This allows the circuits in the
next stages to operate and execute image processing when synchronizing
signals are missing. In Figure 1, if the synchronization selection switch SW 1
selects the Input Sync signal, a switching circuit 2 outputs the Input Sync
unless a signal absence detection circuit 3 detects that the synchronizing
signal is missing, in which case a control 5 switches switching circuit 2 to
output the INT. Sync signal. Similarly, if the synchronization selection
switch SW 1 selects EXT. Sync, a switching circuit 2 outputs the EXT. Sync
signal unless a signal absence detection circuit 4 detects that the
synchronizing signal is missing, in which case a control 5 switches switching
circuit 2 to output the INT. Sync signal. "[W]hen the selected synchronous
signal is missing, there is detection of this fact, and by replacing the selected
synchronous signals with an internal synchronous signal, it is possible to
continue from the next stage's circuits, while preventing a halt to the
operations" (near the end of the translation, under "Effect of the Invention").
Yamagishi discloses substituting internally generated sync signals for
missing sync signals, which is highly pertinent to the problem faced by the
inventor of the '443 patent. Thus, Yamagishi is within the scope of the prior
art that must be considered in determining patentability.
Differences
The difference between the subject matter of claim 26 and Arai is that
Arai does not disclose "generating reference vertical and horizontal
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