public void GetProminentFrequencies_Multiple_Frequencies(params int[] frequencies)
{
var sampleRate = 44100;
var fftSize = 1024;
var amplitude = 1;
var frequencyIndices = Enumerable.Range(0, frequencies.Length);
var sineWaves = frequencies
.Select(frequency => Generate.Sinusoidal(
sampleRate,
sampleRate,
frequency,
amplitude)
.ToList());
var samples = frequencyIndices
.Select(index =>
sineWaves
.Select(sineWave => sineWave[index])
.Sum())
.ToArray();
var prominentFrequencies = Fingerprinting.GetProminentFrequencies(samples, sampleRate);
var expectedBins = frequencies.Select(frequency => FrequencyToBin(sampleRate, fftSize, frequency));
Assert.All(prominentFrequencies, actualBins => Assert.Equal(expectedBins, actualBins));
}
public void GetProminentFrequencies_Single_Frequency(int frequency)
{
var sampleRate = 44100;
var fftSize = 1024;
var amplitude = 1;
var samples = Generate.Sinusoidal(sampleRate, sampleRate, frequency, amplitude);
var prominentFrequencies = Fingerprinting.GetProminentFrequencies(samples, sampleRate);
var expectedBin = FrequencyToBin(sampleRate, fftSize, frequency);
var expectedBins = new[] { expectedBin };
Assert.All(prominentFrequencies, actualBins => Assert.Contains(expectedBin, actualBins));
Assert.All(prominentFrequencies, actualBins => Assert.Equal(expectedBins, actualBins));
}
static void Main(string[] args)
{
// Analyser.AnalysePcmFile(440, "../js/signals/440.pcm");
// Analyser.AnalyseGenerated(440);
Fingerprinting.GetProminentFrequencies("../js/signals/almost-blue.pcm");
}