Appeal No. 2006-0871
Application No. 10/678,799
subtraction digitally using a Fourier transform as taught by Kane
[answer, pages 3-6].
Appellant argues that the claimed invention differs from the
combination of Matsumoto, Falk and Kane in that in the claimed
invention a frequency spectral result of the current ripples
contained in the armature current signal is determined from
differences between (1) a frequency spectral result of the
armature current signal of the motor in which the armature
current signal contains current ripples and interference and (2)
a frequency spectral result of a voltage signal of the motor in
which the motor voltage signal contains the interference such
that the determined frequency spectral result of the current
ripples contained in the armature current signal is void of
frequency components which are superimposed on the armature
current signal as the interference. Appellant asserts that two
different signals are compared in the claimed invention while
Falk teaches using two signals which are based on the same thing.
Appellant argues that there is no suggestion to use a voltage
signal of the motor as the voltage signal which contains the
interference that is common to the interference contained in the
armature current signal while at the same time being essentially
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