IIR filter design

The filter design is based on the following choices of settings:
Filter type: low pass (LP), band pass (BP) or high pass (HP)
Analog prototype: Butterworth or Chebyshev
Filter order: maximum 16; must be even for a BP filter
Filter passband: based on sampling rate of 8000 samples/s (maximum signal frequency 4000 Hz)
Passband ripple: maximum tolerable variation in filter gain within the passband, expressed in decibels (Chebyshev filter only)
After choosing values for these settings, click the “Design” button to design the filter. Once the design calculations have been completed, click the appropriate button to display either of the following: