public void CalculateCoefficients(FFT.Algorithm algorithm, FFT.FilterType filter)
{
// Generate the actual coefficients
this.CurrentAlgorithm = algorithm;
this.CurrentFilter = filter;
if (algorithm == FFT.Algorithm.Kaiser)
{
// For kaiser window function we need to set the attentuation
this.StopBandAttenuation = 60;
// Kaiser also requires transition band
this.TransitionBand = 500;
}
if (this.myFreqFrom == 0.0f && this.myFreqTo == 0.0f)
{
this.myFFT.FreqFrom = 1000;
this.myFFT.FreqTo = 1000f;
}
else
{
this.myFFT.FreqFrom = this.myFreqFrom;
this.myFFT.FreqTo = this.myFreqTo;
}
this.myCoeff = this.myFFT.GenerateCoefficients(this.CurrentFilter, this.CurrentAlgorithm);
}
/// <summary>
/// Performs the actual filtering operation with respect to input from the combo boxes.
/// </summary>
private void FilterCalculation(ref float[] input, FFT.FilterType filter)
{
// Check what kind of filter the user wanted and filter accordingly
switch (filter)
{
case FFT.FilterType.HighPass:
firFilter.HighPassFilter(ref input);
break;
case FFT.FilterType.LowPass:
firFilter.LowPassFilter(ref input);
break;
case FFT.FilterType.BandPass:
firFilter.BandPassFilter(ref input);
break;
}
}
