private float Utility(ref ComplexF[] iq, float phase, float gain)
{
float[] spectrum = new float[4096];
Array.Copy(iq, 0, fftPtr, 2048, 2048);
//Array.Copy(zero, 0, fftPtr, 0, 2048);
for (var i = 0; i < 2048; i++)
{
fftPtr[i].Im += phase * fftPtr[i].Re;
fftPtr[i].Re *= gain;
fftPtr[i].Re *= window[i];
fftPtr[i].Im *= window[i];
}
fft.FFT_Quick(fftPtr, 4096, FourierDirection.Forward);
SpectrumPower(ref fftPtr, ref spectrumPtr, 4096, 50.0f);
Array.Copy(spectrumPtr, 0, spectrum, 2048, 2048);
Array.Copy(spectrumPtr, 2048, spectrum, 0, 2048);
/*Array.Copy(spectrumPtr, 0, DX.new_display_data, 2048, 2048);
* Array.Copy(spectrumPtr, 2048, DX.new_display_data, 0, 2048);
* Array.Copy(DX.new_display_data, DX.new_waterfall_data, 4096);*/
var result = 0.0f;
for (var i = 0; i < 4096 / 2; i++)
{
var distanceFromCenter = 4096 / 2 - i;
if (distanceFromCenter > (0.05f * 4096 / 2))
{
result += Math.Abs(spectrum[i] - spectrum[4096 - 2 - i]);
}
}
Array.Copy(iq, 0, fftPtr, 0, 2048);
return(result);
}