public BassProfile() : base()
{
Name = "Bass";
// bass range 80 - 350 Hz: http://www.listenhear.co.uk/general_acoustics.htm
MinFrequency = 80;
MaxFrequency = 350;
this.frequencyBands = FFTUtil.CalculateFrequencyBoundariesLog(MinFrequency, MaxFrequency, FrequencyBands);
}
public VoiceProfile() : base()
{
Name = "Voice";
// vocal range 80 - 1100 Hz: http://en.wikipedia.org/wiki/Vocal_range
MinFrequency = 80;
MaxFrequency = 1100;
this.frequencyBands = FFTUtil.CalculateFrequencyBoundariesLog(MinFrequency, MaxFrequency, FrequencyBands);
}
public HumanProfile() : base()
{
Name = "Human (slow!)";
FrameSize = 16384;
FrameStep = 512;
SampleRate = 44100;
MinFrequency = 80;
MaxFrequency = 16000;
FrequencyBands = 33;
HashTimeScale = 1d / SampleRate * FrameStep;
this.frequencyBands = FFTUtil.CalculateFrequencyBoundariesLog(MinFrequency, MaxFrequency, FrequencyBands);
}
public DefaultProfile()
{
Name = "Haitsma&Kalker default";
FrameSize = 2048;
FrameStep = 64;
SampleRate = 5512;
MinFrequency = 300;
MaxFrequency = 2000;
FrequencyBands = 33;
FlipWeakestBits = 3;
HashTimeScale = 1d / SampleRate * FrameStep;
this.frequencyBands = FFTUtil.CalculateFrequencyBoundariesLog(MinFrequency, MaxFrequency, FrequencyBands);
}
private int[] MakeFrequencyMap()
{
int[] map = new int[WINDOW_SIZE / 2];
// convert FFT result to compacted frame representation
// linear mapping of first bins up to 370Hz
for (int i = 0; i < 17; i++)
{
map[i] = i;
}
// logarithmic mapping of 370Hz - 12.5kHz
// NOTE same code pattern as in FingerprintGenerator
double[] frequencyMidLogBands = FFTUtil.CalculateFrequencyBoundariesLog(370, 12500, 66);
double bandWidth = SAMPLERATE / 2d / fftFreqBins.Length;
for (int x = 0; x < frequencyMidLogBands.Length - 1; x++)
{
currentFrame[17 + x] = 0;
int lowerIndex = (int)(frequencyMidLogBands[x] / bandWidth);
int upperIndex = (int)(frequencyMidLogBands[x + 1] / bandWidth);
for (int y = lowerIndex; y < upperIndex; y++)
{
map[y] = 17 + x;
}
}
// summation of bins above 12.5kHz
currentFrame[83] = 0;
for (int i = 580; i < fftFreqBins.Length; i++)
{
map[i] = 83;
}
return(map);
}
