WR6K-OM-E Rev A
ISSUED: October 2003
353
IIR Filters
Infinite Impulse Response (IIR) filters are digital filters that emulate analog filters. The four types
offered by the DFP2 option are as follows:
•
Butterworth
•
Chebyshev
•
Inverse
Chebyshev
•
Bessel
The Butterworth or "maximally flat" filter has the flattest amplitude response of all the available
filters. The Bessel filter is noted for its uniform phase response as a function of frequency. The
following figure shows a comparison between Butterworth and Bessel filters. Note that the Bessel
filter has a wider transition bandwidth, but is linear within the pass band.
If you need the fastest rolloff, the Chebyshev filters have the narrowest transition region for a
given number of stages. However, the Chebyshev filter has ripple in the pass band, while the
Inverse Chebyshev filter exhibits a flat pass band response, but has ripple in the stop band.
Summary of Contents for 6000 SERIES
Page 65: ...WR6K OM E Rev A ISSUED October 2003 63 Proper Orientation of Drive ...
Page 131: ...WR6K OM E Rev A ISSUED October 2003 129 Example ...
Page 141: ...WR6K OM E Rev A ISSUED October 2003 139 ...
Page 236: ...Operator s Manual 234 ISSUED October 2003 WR6K OM E Rev A Example 6 ...
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Page 307: ...WR6K OM E Rev A ISSUED October 2003 305 Convolve two signals ...
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