public double[] Equalize(double[] gains, WavData wavData)
{
var n = FourierHelper.GetExpandedPow2(_windowLength + _filterLength - 1);
var size = wavData.Samples.Length + n - _windowLength;
var result = new double[size];
var windows = new double[size / _windowHopSize][];
var windowsComplex = new Complex[size / _windowHopSize][];
for (int i = 0; i < windows.Length; i++)
{
windows[i] = new double[n];
windowsComplex[i] = new Complex[n];
}
var windowFactors = _window.WindowFactors(_windowLength);
var gainsComplex = GenerateGains(gains, wavData.FormatChunk.SampleRate, n);
for (int i = 0; i < windows.Length; i++)
{
for (int j = 0; j < _windowLength; j++)
{
if (i * _windowHopSize + j < wavData.Samples.Length)
{
windows[i][j] = windowFactors[j] * wavData.Samples[i * _windowHopSize + j];
}
else
{
windows[i][j] = 0;
}
}
for (int j = _windowLength; j < n; j++)
{
windows[i][j] = 0;
}
windowsComplex[i] = FourierTransform.FFT(windows[i]);
windowsComplex[i] = AdjustGain(gainsComplex, windowsComplex[i]);
windows[i] = FourierTransform.IFFT(windowsComplex[i]);
}
for (int i = 0; i < windows.Length; i++)
{
for (int j = 0; j < windows[i].Length; j++)
{
if (i * _windowHopSize + j < wavData.Samples.Length)
{
result[i * _windowHopSize + j] += windows[i][j];
}
}
}
return(result);
}
public double[] Process(WavData wavData)
{
var n = FourierHelper.GetExpandedPow2(_windowLength + _filterLength - 1);
var size = wavData.Samples.Length + n - _windowLength;
var result = new double[size];
var windows = new double[size / _windowHopSize][];
var windowsComplex = new Complex[size / _windowHopSize][];
for (int i = 0; i < windows.Length; i++)
{
windows[i] = new double[n];
windowsComplex[i] = new Complex[n];
}
if (_gain < 0)
{
_gain = 1 / Math.Abs(_gain) - 1;
}
var windowFactors = _window.WindowFactors(_windowLength);
for (int i = 0; i < windows.Length; i++)
{
for (int j = 0; j < _windowLength; j++)
{
if (i * _windowHopSize + j < wavData.Samples.Length)
{
windows[i][j] = windowFactors[j] * wavData.Samples[i * _windowHopSize + j];
}
else
{
windows[i][j] = 0;
}
}
for (int j = _windowLength; j < n; j++)
{
windows[i][j] = 0;
}
}
var freq = wavData.FormatChunk.SampleRate / _lfo;
var filterSize = _endBandFreq - _bandSize - _startBandFreq;
for (int i = 0; i < windows.Length; i++)
{
var highPass = (Math.Sin(2 * Math.PI * i * _windowHopSize / freq) * 0.5 + 0.5) * filterSize + _startBandFreq;
var lowPass = highPass + _bandSize;
var bandFilterFactors = BasicFilter.BandPassFilterFactors(lowPass, highPass, wavData.FormatChunk.SampleRate, _filterLength, n);
windowsComplex[i] = FourierTransform.FFT(windows[i]);
for (int j = 0; j < windowsComplex[i].Length; j++)
{
windowsComplex[i][j] += windowsComplex[i][j] * bandFilterFactors[j] * _gain;
}
windows[i] = FourierTransform.IFFT(windowsComplex[i]);
}
for (int i = 0; i < windows.Length; i++)
{
for (int j = 0; j < windows[i].Length; j++)
{
if (i * _windowHopSize + j < wavData.Samples.Length)
{
result[i * _windowHopSize + j] += windows[i][j];
}
}
}
return(result);
}
