Appeal No. 95-0840
Application 08/029,343
the product of a second video input signal and the complement of
the same mixer control signal. This feature is recited in some
manner at least once in each independent claim on appeal. This
language corresponds to appellants’ implementation of the art-
recognized non-additive mixer equation introduced at the bottom
of page 4 of appellants’ specification.
At page 7 of the answer, the examiner considers this
equation to represent non-additive mixing as conventionally
defined in the art when the modifying values are exclusively “1”
or “0.” Page 5 of appellants’ specification at lines 9 through
13 indicate that appellants’ version of a non-additive video
mixer is functionally equivalent to what is known in the prior
art when, in rare instances, both offset signals of
representative Fig. 2 are zero and the gain control signal is at
a maximum or infinity. The so-called “softening” the transition
feature between the input video signals discussed at the bottom
of page 5 of the invention is clearly consistent with the aim of
the disclosure set forth in the first sentence of page 1 of the
written description where appellants indicate that the invention
is an improved video non-additive mixer circuit that provides
control over the point and rate of transition of video signals.
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