Chebyshev IIR Filter

C/C++ Equivalent: NISCOPE_VAL_CHEBYSHEV_FILTER

The input waveform is filtered with a Chebyshev IIR algorithm. The type of the filter is specified by the Filter Type property or the NISCOPE_ATTR_MEAS_FILTER_TYPE attribute as any of the following values:

• lowpass
• highpass
• bandpass
• bandstop

The Chebyshev filter allows you to specify the passband ripple, the Filter Ripple or the NISCOPE_ATTR_MEAS_FILTER_RIPPLE, in decibels. The order of the filter is specified by the Filter Order property or the NISCOPE_ATTR_MEAS_FILTER_ORDER attribute. Also, a number of points equal to the Percent Waveform Transient property or the NISCOPE_ATTR_MEAS_FILTER_TRANSIENT_WAVEFORM_PERCENT attribute divided by 100 times the input size are eliminated from the beginning of the filtered waveform, so the transient response of the filter does not affect further measurements.