public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
FFT fft = new FFT(1024, 44100);
float[] samples = new float[1024];
float[] spectrum = new float[1024 / 2 + 1];
float[] lastSpectrum = new float[1024 / 2 + 1];
List <float> spectralFlux = new List <float>();
while (decoder.Read(samples, 0, samples.Length) > 0)
{
fft.Forward(samples);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
System.Array.Copy(fft.GetSpectrum(), 0, spectrum, 0, spectrum.Length);
float flux = 0;
for (int i = 0; i < spectrum.Length; i++)
{
flux += (spectrum[i] - lastSpectrum[i]);
}
spectralFlux.Add(flux);
}
Plot plot = new Plot("Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, 1024, FILE);
//new PlaybackVisualizer(plot, spectralFlux.Count, FILE);
}
public static void Main(string[] argv)
{
const float frequency = 440; // Note A
float increment = (float)(2*Math.PI) * frequency / 44100;
float angle = 0;
float[] samples = new float[1024];
FFT fft = new FFT(1024, 44100);
for(int i = 0; i < samples.Length; i++)
{
samples[i] = (float)Math.Sin(angle);
angle += increment;
}
fft.Forward(samples);
Plot plot = new Plot("Note A Spectrum", 512, 512);
plot.plot(fft.GetSpectrum(), 1, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
const float frequency = 440; // Note A
float increment = (float)(2 * Math.PI) * frequency / 44100;
float angle = 0;
float[] samples = new float[1024];
FFT fft = new FFT(1024, 44100);
for (int i = 0; i < samples.Length; i++)
{
samples[i] = (float)Math.Sin(angle);
angle += increment;
}
fft.Forward(samples);
Plot plot = new Plot("Note A Spectrum", 512, 512);
plot.plot(fft.GetSpectrum(), 1, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
FFT fft = new FFT(1024, 44100);
fft.Window(FFT.HAMMING);
float[] samples = new float[1024];
float[] spectrum = new float[1024 / 2 + 1];
float[] lastSpectrum = new float[1024 / 2 + 1];
List<float> spectralFlux = new List<float>();
while(decoder.Read(samples, 0, samples.Length) > 0)
{
fft.Forward(samples);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
System.Array.Copy(fft.GetSpectrum(), 0, spectrum, 0, spectrum.Length);
float flux = 0;
for(int i = 0; i < spectrum.Length; i++)
{
float @value = (spectrum[i] - lastSpectrum[i]);
flux += @value < 0 ? 0 : @value;
}
spectralFlux.Add(flux);
}
Plot plot = new Plot("Hamming Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, 1024, FILE);
}
