public static double[,] ExtractFreqSubband(double[,] m, int minHz, int maxHz, bool doMelscale, int binCount, double binWidth)
{
int c1;
int c2;
AcousticEvent.Freq2BinIDs(doMelscale, minHz, maxHz, binCount, binWidth, out c1, out c2);
return(DataTools.Submatrix(m, 0, c1, m.GetLength(0) - 1, c2));
}
/// <summary>
/// Extracts an acoustic event from a sonogram given the location of a user defined rectangular marquee.
/// NOTE: Nyquist value is used ONLY if using mel scale.
/// </summary>
/// <param name="m">the sonogram data as matrix of reals</param>
/// <param name="start">start time in seconds</param>
/// <param name="end">end time in seconds</param>
/// <param name="frameOffset">the time scale: i.e. the duration in seconds of each frame</param>
/// <param name="minHz">lower freq bound of the event</param>
/// <param name="maxHz">upper freq bound of the event</param>
/// <param name="doMelscale">informs whether the sonogram data is linear or mel scale</param>
/// <param name="nyquist">full freq range 0-Nyquist</param>
/// <param name="binWidth">the frequency scale i.e. herz per bin width - assumes linear scale</param>
/// <returns></returns>
public static double[,] ExtractEvent(double[,] m, double start, double end, double frameOffset,
int minHz, int maxHz, bool doMelscale, int nyquist, double binWidth)
{
int r1;
int r2;
AcousticEvent.Time2RowIDs(start, end - start, frameOffset, out r1, out r2);
int c1;
int c2;
AcousticEvent.Freq2BinIDs(doMelscale, minHz, maxHz, nyquist, binWidth, out c1, out c2);
return(DataTools.Submatrix(m, r1, c1, r2, c2));
}
public static double[] ExtractModalNoiseSubband(double[] modalNoise, int minHz, int maxHz, bool doMelScale, int nyquist, double binWidth)
{
//extract subband modal noise profile
int c1, c2;
AcousticEvent.Freq2BinIDs(doMelScale, minHz, maxHz, nyquist, binWidth, out c1, out c2);
int subbandCount = c2 - c1 + 1;
var subband = new double[subbandCount];
for (int i = 0; i < subbandCount; i++)
{
subband[i] = modalNoise[c1 + i];
}
return(subband);
}
