User guide

CME 2 User Guide Filters
Copley Controls 185
C.3.3: Notch Filter
Notch filters allow a bandstop in a range between two selectable frequencies. It may be
Butterworth (no ripple), Chebyshev (selectable passband ripple), or elliptical (ripple on
both passband and bandstop).
Example:
C.3.4: Band Pass Filter
Band pass filters allow a range of frequencies, between two selectable cut-offs, to pass. It
may be Butterworth, Chebyshev, or Elliptical.
C.3.5: Custom Biquad Filter
The Bi-Quadratic filter has two quadratic terms: one in the numerator, and one in the
denominator. The numerator affects the filter’s two zeros and the denominator affects the
filter’s two poles. Many filter classes and types can be expressed in the Bi-Quad form by
entering the coefficients. The coefficients can be calculated using any commercially
available math software package and entered as floating point numbers. However, due to
the fixed-point representation, the numbers may be rounded.
Example: