public void Test_Mel_Spectrogram()
{
(int sampleRate, double[] audio) = WavFile.ReadMono("../../../../../data/cant-do-that-44100.wav");
int fftSize = 4096;
var spec = new Spectrogram(sampleRate, fftSize, stepSize: 500);
spec.Add(audio);
spec.SaveImage("halNotMel.png", 4, true);
Bitmap bmp = spec.GetBitmapMel(250, 4, true);
bmp.Save("../../../../../dev/graphics/halMel.png", ImageFormat.Png);
}
public void Test_SFF_Mel()
{
(int sampleRate, double[] audio) = WavFile.ReadMono("../../../../../data/cant-do-that-44100.wav");
int fftSize = 1 << 12;
var spec = new Spectrogram(sampleRate, fftSize, stepSize: 700);
spec.SetWindow(FftSharp.Window.Hanning(fftSize / 3)); // sharper window than typical
spec.Add(audio);
Bitmap bmp = spec.GetBitmapMel(250, 3, true);
bmp.Save("../../../../../dev/sff/halMel.png", System.Drawing.Imaging.ImageFormat.Png);
spec.SaveData("../../../../../dev/sff/halMel.sff", melBinCount: 250);
var spec2 = new SFF("../../../../../dev/sff/halMel.sff");
Assert.AreEqual(spec.SampleRate, spec2.SampleRate);
Assert.AreEqual(spec.StepSize, spec2.StepSize);
Assert.AreEqual(spec.Width, spec2.Width);
Assert.AreEqual(spec.FftSize, spec2.FftSize);
Assert.AreEqual(spec.NextColumnIndex, spec2.FftFirstIndex);
Assert.AreEqual(spec.Height, spec2.Height);
Assert.AreEqual(spec.OffsetHz, spec2.OffsetHz);
}