public unsafe void Configure(double sampleRate, int decimationStageCount)
{
this._audioDecimationRatio = 1 << decimationStageCount;
if (this._sampleRate != sampleRate)
{
this._sampleRate = sampleRate;
this._pilotFilterBuffer = UnsafeBuffer.Create(sizeof(IirFilter));
this._pilotFilter = (IirFilter *)(void *)this._pilotFilterBuffer;
this._pilotFilter->Init(IirFilterType.BandPass, 19000.0, this._sampleRate, 500.0);
this._pll->SampleRate = (float)this._sampleRate;
this._pll->DefaultFrequency = 19000f;
this._pll->Range = 20f;
this._pll->Bandwidth = 10f;
this._pll->Zeta = 0.707f;
this._pll->PhaseAdjM = StereoDecoder._pllPhaseAdjM;
this._pll->PhaseAdjB = StereoDecoder._pllPhaseAdjB;
this._pll->LockTime = 0.5f;
this._pll->LockThreshold = 1f;
double num = sampleRate / (double)this._audioDecimationRatio;
Complex[] kernel = FilterBuilder.MakeComplexKernel(num, 250, Math.Min(0.9 * num, 30000.0), 0.0, WindowType.BlackmanHarris4);
this._channelAFilter = new ComplexFilter(kernel);
this._channelBFilter = new ComplexFilter(kernel);
this._deemphasisAlpha = (float)(1.0 - Math.Exp(-1.0 / (num * (double)StereoDecoder._deemphasisTime)));
this._deemphasisAvgL = 0f;
this._deemphasisAvgR = 0f;
}
if (this._channelADecimator != null && this._channelBDecimator != null && this._audioDecimationRatio == this._channelADecimator.DecimationRatio)
{
return;
}
this._channelADecimator = new FloatDecimator(this._audioDecimationRatio);
this._channelBDecimator = new FloatDecimator(this._audioDecimationRatio);
}
public unsafe void Process(Complex* buffer, int length)
{
if (!this._spectrumAnalyzer.Visible)
return;
if (IFProcessor._displayBeforeFilter && this._iqStream.Length < length * 4)
this._iqStream.Write(buffer, length);
if (this._enableFilter)
{
if (this._complexFilter == null)
this._complexFilter = new ComplexFilter(FilterBuilder.MakeComplexKernel(this._sampleRate, 510, (double) this._filterbandwidth, (double) this._filterOffset, WindowType.BlackmanHarris7));
else if (this._updateFilter)
{
this._complexFilter.SetKernel(FilterBuilder.MakeComplexKernel(this._sampleRate, 510, (double) this._filterbandwidth, (double) this._filterOffset, WindowType.BlackmanHarris7));
this._updateFilter = false;
}
this._complexFilter.Process(buffer, length);
}
if (IFProcessor._displayBeforeFilter || this._iqStream.Length >= length * 4)
return;
this._iqStream.Write(buffer, length);
}
public void Process(Complex* buffer, int length)
{
if (!_spectrumAnalyzer.Visible)
{
return;
}
if (_displayBeforeFilter)
{
if (_iqStream.Length < length * 4)
{
_iqStream.Write(buffer, length);
}
}
if (_enableFilter)
{
if (_complexFilter == null)
{
var kernel = FilterBuilder.MakeComplexKernel(_sampleRate, DefaultFilterOrder, _filterbandwidth, _filterOffset, WindowType.BlackmanHarris7);
_complexFilter = new ComplexFilter(kernel);
}
else if (_updateFilter)
{
var kernel = FilterBuilder.MakeComplexKernel(_sampleRate, DefaultFilterOrder, _filterbandwidth, _filterOffset, WindowType.BlackmanHarris7);
_complexFilter.SetKernel(kernel);
_updateFilter = false;
}
_complexFilter.Process(buffer, length);
}
if (!_displayBeforeFilter)
{
if (_iqStream.Length < length * 4)
{
_iqStream.Write(buffer, length);
}
}
}
private void UpdateFilters(bool refresh)
{
int num = 0;
int num2 = 15000;
int num3 = 0;
switch (this._actualDetectorType)
{
case DetectorType.WFM:
case DetectorType.AM:
num = 20;
num2 = Math.Min(this._bandwidth / 2, 15000);
break;
case DetectorType.CW:
num = Math.Abs(this._cwToneShift) - this._bandwidth / 2;
num2 = Math.Abs(this._cwToneShift) + this._bandwidth / 2;
break;
case DetectorType.USB:
num = (this._lockCarrier ? 20 : 100);
num2 = this._bandwidth;
num3 = this._bandwidth / 2;
break;
case DetectorType.LSB:
num = (this._lockCarrier ? 20 : 100);
num2 = this._bandwidth;
num3 = -this._bandwidth / 2;
break;
case DetectorType.DSB:
num = 20;
num2 = this._bandwidth / 2;
break;
case DetectorType.NFM:
num = 300;
num2 = Math.Min(this._bandwidth / 2, 3800);
break;
}
Complex[] array = FilterBuilder.MakeComplexKernel(this._sampleRate / (double)(1 << this._baseBandDecimationStageCount), this._filterOrder, (double)this._bandwidth, (double)num3, this._windowType);
if ((this._iqFilter == null | refresh) || this._iqFilter.KernelSize != array.Length)
{
this._iqFilter = new ComplexFilter(array);
}
else
{
this._iqFilter.SetKernel(array);
}
double num4 = this._sampleRate / (double)(1 << this._decimationStageCount);
if (refresh)
{
if (this._actualDetectorType == DetectorType.CW)
{
this._audioIIR.Init(IirFilterType.BandPass, (double)Math.Abs(this._cwToneShift), num4, 3.0);
}
else if (this._actualDetectorType == DetectorType.WFM)
{
double sampleRate = this._sampleRate / (double)(1 << this._baseBandDecimationStageCount);
this._audioIIR.Init(IirFilterType.HighPass, (double)num, sampleRate, 1.0);
}
else
{
this._audioIIR.Init(IirFilterType.HighPass, (double)num, num4, 1.0);
}
}
Complex[] array2 = FilterBuilder.MakeComplexKernel(num4, this._filterOrder, (double)(num2 - num), (double)(num2 + num) * 0.5, this._windowType);
if ((this._audioFIR == null | refresh) || this._audioFIR.KernelSize != array2.Length)
{
this._audioFIR = new ComplexFilter(array2);
}
else
{
this._audioFIR.SetKernel(array2);
}
this._deemphasisAlpha = (float)(1.0 - Math.Exp(-1.0 / (num4 * 0.00014999999257270247)));
this._deemphasisState = 0f;
}
