Appeal No. 95-5109
Application No. 08/063,665
detector circuit for detecting the maximum level of a high
frequency component of a luminance signal during a vertical
field interval, and not the claimed simultaneous use of both
circuits. With respect to the claimed averaging means (claim
1), we agree with appellant’s argument (Brief, page 11) that
“Kondo does not disclose such a device.”
The secondary reference to Murashima discloses in the
Abstract that:
An automatic focusing circuit in a video camera
separates a high frequency component from the video
signal obtained in an image sensing circuit 4 for
every field. After the separated high frequency
component is integrated in an integration circuit
10, the result is converted into a digital value by
an A/D converter 11 and is applied to a holding
circuit 12 as a focus evaluating value. The holding
circuit 12, which comprises first to fifth memories
coupled in series, always holds the newest
successive five focus evaluating values. The
largest focus evaluating value is detected by the
maximum value detecting circuit 18 for every field
and is applied to a memory 19. The maximum value is
compared with the maximum value one field before
held in a memory 20 in a comparator
9
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