public static Tuple <BaseSonogram, AcousticEvent, double[, ], double[], double[, ]> Execute_Extraction(
AudioRecording recording,
double eventStart,
double eventEnd,
int minHz,
int maxHz,
double frameOverlap,
double backgroundThreshold,
TimeSpan segmentStartOffset)
{
//ii: MAKE SONOGRAM
SonogramConfig sonoConfig = new SonogramConfig(); //default values config
sonoConfig.SourceFName = recording.BaseName;
//sonoConfig.WindowSize = windowSize;
sonoConfig.WindowOverlap = frameOverlap;
BaseSonogram sonogram = new SpectrogramStandard(sonoConfig, recording.WavReader);
Log.WriteLine("Frames: Size={0}, Count={1}, Duration={2:f1}ms, Overlap={5:f2}%, Offset={3:f1}ms, Frames/s={4:f1}",
sonogram.Configuration.WindowSize, sonogram.FrameCount, (sonogram.FrameDuration * 1000),
(sonogram.FrameStep * 1000), sonogram.FramesPerSecond, frameOverlap);
int binCount = (int)(maxHz / sonogram.FBinWidth) - (int)(minHz / sonogram.FBinWidth) + 1;
Log.WriteIfVerbose("Freq band: {0} Hz - {1} Hz. (Freq bin count = {2})", minHz, maxHz, binCount);
//calculate the modal noise profile
double SD_COUNT = 0.0; // number of noise standard deviations used to calculate noise threshold
NoiseProfile profile = NoiseProfile.CalculateModalNoiseProfile(sonogram.Data, SD_COUNT); //calculate modal noise profile
double[] modalNoise = DataTools.filterMovingAverage(profile.NoiseMode, 7); //smooth the noise profile
//extract modal noise values of the required event
double[] noiseSubband = SpectrogramTools.ExtractModalNoiseSubband(modalNoise, minHz, maxHz, false, sonogram.NyquistFrequency, sonogram.FBinWidth);
//extract data values of the required event
double[,] target = SpectrogramTools.ExtractEvent(sonogram.Data, eventStart, eventEnd, sonogram.FrameStep,
minHz, maxHz, false, sonogram.NyquistFrequency, sonogram.FBinWidth);
// create acoustic event with defined boundaries
AcousticEvent ae = new AcousticEvent(segmentStartOffset, eventStart, eventEnd - eventStart, minHz, maxHz);
ae.SetTimeAndFreqScales(sonogram.FramesPerSecond, sonogram.FBinWidth);
//truncate noise
sonogram.Data = SNR.TruncateBgNoiseFromSpectrogram(sonogram.Data, modalNoise);
sonogram.Data = SNR.RemoveNeighbourhoodBackgroundNoise(sonogram.Data, backgroundThreshold);
double[,] targetMinusNoise = SpectrogramTools.ExtractEvent(sonogram.Data, eventStart, eventEnd, sonogram.FrameStep,
minHz, maxHz, false, sonogram.NyquistFrequency, sonogram.FBinWidth);
return(Tuple.Create(sonogram, ae, target, noiseSubband, targetMinusNoise));
}