public LinqedDetector()
{
sampleRate = 8000;
numSamples = 205;
threshold = 35.0;
lows = lowTones.Select(f => Goertzel.Init(f, sampleRate, numSamples)).ToArray();
highs = highTones.Select(f => Goertzel.Init(f, sampleRate, numSamples)).ToArray();
}
public LessStatefulDetector()
{
sampleRate = 8000;
numSamples = 205;
threshold = 35.0;
initLoResps = lowTones.Select(f => Goertzel.Init(f, sampleRate, numSamples)).ToArray();
initHiResps = highTones.Select(f => Goertzel.Init(f, sampleRate, numSamples)).ToArray();
}
public void TestGoertzel()
{
float[] array = { 1, 2, 3, 4, 5, 6, 7, 8 };
var cmpx = new Goertzel(8).Direct(array, 2);
Assert.Multiple(() =>
{
Assert.That(cmpx.Real, Is.EqualTo(-4).Within(1e-6));
Assert.That(cmpx.Imaginary, Is.EqualTo(4).Within(1e-6));
});
}
public static Goertzel MeasureFrequency(this IEnumerable <float> samples, int targetFreq) => samples
.Take(Config.Default.SampleBlockSize)
.Aggregate(
Goertzel.Init(targetFreq, Config.Default.SampleRate, Config.Default.SampleBlockSize),
(g, s) => g.AddSample(s));
