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Figure 15-3:
Unit step response of an eight-pole Butterworth filter approximated by a
35-coefficient FIR filter.
The unit step response closely resembles that of an analog Butterworth filter.
Linear-Phase Filter
The linear phase filter is designed using the well-known Remez algorithm. This filter
provides a much sharper attenuation curve than the corresponding curve for the
Butterworth filter. Notice that a linear phase filter with a roll-off start frequency of 1000
Hz at a 2500 samples per second sample rate is provided for compatibility with the
similar low level layer sample rate and filter combination.
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