Appeal No. 1998-2554
Application 08/527,334
Appellant or the Examiner that frequency division multiplexing
is a form of "mixing."
As we understand "mixing," this term refers to combining
two or more signals into a composite signal. For example, a
"mixer" is defined as "A) In a sound transmission, recording
or reproducing system, a device having two or more inputs,
usually adjustable, and a common output, which operates to
combine linearly in a desired proportion the separate input
signals to produce an output signal . . .," The New IEEE
Standard Dictionary of Electrical and Electronics Terms (5th
ed., IEEE, Inc., 1993). With video, the signals are typically
not linearly combined as in audio, except for the generation
of special effects such as fading or dissolving from one scene
to another. Instead, a video image may be reduced in size
(using data reduction or compression techniques) and overlaid
on another video image (e.g., picture in picture) or two video
images may be juxtaposed to occupy adjacent portions of a
display. In both cases, the resultant video signal is a
standard frame (two fields) of data containing a composite of
both video images. This is consistent with Appellant's
description of mixing (specification, p. 3, line 32 to p. 4,
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