public void SonogramDecibelMethodsAreEquivalent()
{
var recording = new AudioRecording(PathHelper.ResolveAsset("Recordings", "BAC2_20071008-085040.wav"));
// specfied linear scale
var freqScale = new FrequencyScale(nyquist: 11025, frameSize: 1024, hertzGridInterval: 1000);
var sonoConfig = new SonogramConfig
{
WindowSize = freqScale.FinalBinCount * 2,
WindowOverlap = 0.2,
SourceFName = recording.BaseName,
NoiseReductionType = NoiseReductionType.None,
NoiseReductionParameter = 0.0,
};
// Method 1
var sonogram = new AmplitudeSonogram(sonoConfig, recording.WavReader);
var expectedDecibelSonogram = MFCCStuff.DecibelSpectra(sonogram.Data, sonogram.Configuration.WindowPower, sonogram.SampleRate, sonogram.Configuration.epsilon);
// Method 2: make sure that the decibel spectrum is the same no matter which path we take to calculate it.
var actualDecibelSpectrogram = new SpectrogramStandard(sonoConfig, recording.WavReader);
CollectionAssert.That.AreEqual(expectedDecibelSonogram, actualDecibelSpectrogram.Data, EnvelopeAndFftTests.Delta);
}
