public static double[,] DecibelSpectra(double[,] amplitudeM, double windowPower, int sampleRate, double epsilon, FrequencyScale freqScale)
{
double[,] powerSpectra = PowerSpectra(amplitudeM, windowPower, sampleRate, epsilon, freqScale);
// Convert the power values to log using: dB = 10*log(power)
var decibelSpectra = MatrixTools.Power2DeciBels(powerSpectra, out var min, out var max);
return(decibelSpectra);
}
public static double[,] ConvertAmplitudeSpectrogramToDecibelOctaveScale(double[,] inputSpgram, FrequencyScale freqScale)
{
//var dataMatrix = MatrixTools.Submatrix(inputSpgram, 0, 1, inputSpgram.GetLength(0) - 1, inputSpgram.GetLength(1) - 1);
//square the values to produce power spectrogram
var dataMatrix = MatrixTools.SquareValues(inputSpgram);
//convert spectrogram to octave scale
dataMatrix = ConvertLinearSpectrogramToOctaveFreqScale(dataMatrix, freqScale);
dataMatrix = MatrixTools.Power2DeciBels(dataMatrix, out var min, out var max);
return(dataMatrix);
}
