Appeal No. 96-1895
Application 08/011,682
Appellant argues that Abed and Kanda do not disclose
the following features of the independent claims: (1) "a
configuration of a positioning control system, in which a
low pass filter is constituted by an adequate combination of
a notch filter and an elliptical function filter (Br12); and
(2) "turning ON the low pass filter by a switching operation
when a seek operation proceeds to a track following
operation" (Br12).
(1) Low pass filter comprising notch filter
and elliptical function filter
Claim 1 recites a positioning control system having a
"low pass filter which has an abrupt slope and a
discontinuous pole in the gain-frequency characteristics
thereof . . . wherein said lowpass [sic] filter comprises a
notch filter having said abrupt slope for suppressing a
lowest resonance frequency and an elliptical function filter
having said pole for suppressing a second lowest, or higher,
resonance frequency." Claim 9 recites a positioning control
system having a "low pass filter which has an abrupt slope
and a discontinuous pole in the gain-frequency
characteristics thereof . . . wherein said low pass filter
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