public void RealExampleDChord()
{
var spectrumAnalyser = new SpectrumAnalyzer();
float[] fft = new float[4096];
SetFrequenceLevel(fft, 290.70f, 0.203f); //D4
SetFrequenceLevel(fft, 441.43f, 0.685f); //A4
SetFrequenceLevel(fft, 592.16f, 0.456f); //D5
SetFrequenceLevel(fft, 742.90f, 0.339f); //F#5
SetFrequenceLevel(fft, 882.86f, 0.9000f); //A5 (harmonics)
SetFrequenceLevel(fft, 1184.33f, 0.291f); //D6 (harmonics)
SetFrequenceLevel(fft, 1324.29f, 0.650f); //E6 (harmonics)
SetFrequenceLevel(fft, 1485.79f, 0.380f); //F#6 (harmonics)
SetFrequenceLevel(fft, 1765.72f, 0.166f); //A6 (harmonics)
SetFrequenceLevel(fft, 2217.92f, 0.460f); //C#7 (harmonics)
SetFrequenceLevel(fft, 2357.89f, 0.403f); //D7 (harmonics)
SetFrequenceLevel(fft, 2960.82f, 0.435f); //F#7 (harmonics)
SetFrequenceLevel(fft, 3703.71f, 0.297f); //A#7 (harmonics)
List <IMusicalNote> notes = spectrumAnalyser.GetMusicalNotes(fft);
spectrumAnalyser.DeleteUnusefulNotes(ref notes);
Assert.AreEqual(6, notes.Count);
Assert.AreEqual("D4", notes[0].ToString());
Assert.AreEqual("A4", notes[1].ToString());
Assert.AreEqual("D5", notes[2].ToString());
Assert.AreEqual("Gb5", notes[3].ToString());
Assert.AreEqual("A5", notes[4].ToString());
Assert.AreEqual("D6", notes[5].ToString());
}
public void EmptyFFT()
{
var spectrumAnalyser = new SpectrumAnalyzer();
float[] fft = new float[4096];
List <IMusicalNote> notes = spectrumAnalyser.GetMusicalNotes(fft);
Assert.AreEqual(0, notes.Count);
}
public void LowCutTest()
{
var spectrumAnalyser = new SpectrumAnalyzer();
float[] fft = new float[4096];
SetFrequenceLevel(fft, 96.8f, 0.1f); //freq < 96,89941Hz
SetFrequenceLevel(fft, 96.9f, 0.1f); //freq > 96,89941Hz
List <IMusicalNote> notes = spectrumAnalyser.GetMusicalNotes(fft);
Assert.AreEqual(1, notes.Count);
}
public void A4AtNoiseLevel()
{
var spectrumAnalyser = new SpectrumAnalyzer();
float[] fft = new float[4096];
SetFrequenceLevel(fft, 440.0f, 0.0249f); //A4 - just noise (level too low)
SetFrequenceLevel(fft, 880.0f, 0.025f); //A5 - valid
List <IMusicalNote> notes = spectrumAnalyser.GetMusicalNotes(fft);
Assert.AreEqual(1, notes.Count);
Assert.AreEqual("A5", notes[0].ToString());
}
public void OneNote_A4()
{
var spectrumAnalyser = new SpectrumAnalyzer();
float[] fft = new float[4096];
var level = 0.1f;
SetFrequenceLevel(fft, 440.0f, level);
List <IMusicalNote> notes = spectrumAnalyser.GetMusicalNotes(fft);
Assert.AreEqual(1, notes.Count);
Assert.AreEqual("A4", notes[0].ToString());
Assert.AreEqual(level, notes[0].Volume);
}