Class SpectralPeakTracking2018

This class contain the pure algorithm that finds spectral peak tracks from a db spectrogram and settings.

Inheritance
Object
SpectralPeakTracking2018
Inherited Members
Namespace: AudioAnalysisTools
Assembly: AudioAnalysisTools.dll
Syntax
public static class SpectralPeakTracking2018

Methods

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CalculateAverageEnergy(Double[], Int32, Int32)

outputs the average energy within a specified band.

Declaration
public static double CalculateAverageEnergy(double[] spectrum, int minInd, int maxInd)
Parameters
Type Name Description
Double[] spectrum
Int32 minInd
Int32 maxInd
Returns
Type Description
Double
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DrawSonogram(BaseSonogram, Double[,])

draw the spectrogram with red marks indicating the local spectral peaks.

Declaration
public static Image DrawSonogram(BaseSonogram sonogram, double[, ] hits)
Parameters
Type Name Description
BaseSonogram sonogram
Double[,] hits
Returns
Type Description
SixLabors.ImageSharp.Image
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DrawTracks(BaseSonogram, Double[,], List<Track>)

draw the spectrogram with spectral tracks.

Declaration
public static Image DrawTracks(BaseSonogram sonogram, double[, ] hits, List<Track> tracks)
Parameters
Type Name Description
BaseSonogram sonogram
Double[,] hits
List<Track> tracks
Returns
Type Description
SixLabors.ImageSharp.Image
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FindLocalSpectralPeaks(Double[,], Int32[], Int32, Int32, Int32, Double)

find spectral peaks per frame by subtracting the average energy of top and bottom band from the syllable band energy. then if it is higher than a dB threshold, the index of the peak bin will be returned.

Declaration
public static Tuple<int[][], int[][]> FindLocalSpectralPeaks(double[, ] matrix, int[] peakBinsIndex, int widthMidBand, int topBufferSize, int bottomBufferSize, double threshold)
Parameters
Type Name Description
Double[,] matrix
Int32[] peakBinsIndex
Int32 widthMidBand
Int32 topBufferSize
Int32 bottomBufferSize
Double threshold
Returns
Type Description
Tuple<Int32[][], Int32[][]>
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GetArbitraryFreqBandMatrix(Double[,], Int32, Int32)

outputs a matrix with arbitrary minimum and maximum frequency bins. this method exists in PatchSampling class.

Declaration
public static double[, ] GetArbitraryFreqBandMatrix(double[, ] matrix, int minFreqBin, int maxFreqBin)
Parameters
Type Name Description
Double[,] matrix
Int32 minFreqBin
Int32 maxFreqBin
Returns
Type Description
Double[,]
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GetArbitraryMatrix(Double[,], Int32, Int32, Int32, Int32)

outputs a matrix with arbitrary boundaries to Y (freq) and X (time) axes.

Declaration
public static double[, ] GetArbitraryMatrix(double[, ] matrix, int startY, int endY, int startX, int endX)
Parameters
Type Name Description
Double[,] matrix
Int32 startY
Int32 endY
Int32 startX
Int32 endX
Returns
Type Description
Double[,]
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GetPeakBinsIndex(Double[,], Int32, Int32)

outputs an array of peak bins indices per frame.

Declaration
public static int[] GetPeakBinsIndex(double[, ] matrix, int minFreqBin, int maxFreqBin)
Parameters
Type Name Description
Double[,] matrix
Int32 minFreqBin
Int32 maxFreqBin
Returns
Type Description
Int32[]
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MakeHitMatrix(Double[,], Int32[][], Int32[][])

outputs a matrix with the same size of the input matrix. all values are zero, except the points of interest (i.e., local spectral peaks). these bins can be filled with amplitude values or 1.

Declaration
public static double[, ] MakeHitMatrix(double[, ] matrix, int[][] pointsOfInterest, int[][] bandIndex)
Parameters
Type Name Description
Double[,] matrix
Int32[][] pointsOfInterest
Int32[][] bandIndex
Returns
Type Description
Double[,]
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MakeSpectralPeakArray(Double[,], Int32[][])

Declaration
public static int[] MakeSpectralPeakArray(double[, ] matrix, int[][] targetPeakBinsIndex)
Parameters
Type Name Description
Double[,] matrix
Int32[][] targetPeakBinsIndex
Returns
Type Description
Int32[]
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SpectralPeakTracking(Double[,], SpectralPeakTrackingSettings, Double, Double)

Declaration
public static SpectralPeakTracking2018.Output SpectralPeakTracking(double[, ] spectrogram, SpectralPeakTrackingSettings settings, double hertzPerFreqBin, double timePerFrame)
Parameters
Type Name Description
Double[,] spectrogram
SpectralPeakTrackingSettings settings
Double hertzPerFreqBin
Double timePerFrame
Returns
Type Description
SpectralPeakTracking2018.Output
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SpectralPeakTracking(Double[,], Int32[], Double, Double)

if there is any local peak in a frame, this method will middle the peak bin and will count the following peaks in a pre-defined boundary (startX, endX, startY, endY). If the number of peaks in that boundary is higher than a threshold, that will be considered as a call.

Declaration
public static List<object[]> SpectralPeakTracking(double[, ] spectrogram, int[] SpectralPeakArray, double timePerFrame, double hertzPerFreqBin)
Parameters
Type Name Description
Double[,] spectrogram
Int32[] SpectralPeakArray
Double timePerFrame
Double hertzPerFreqBin
Returns
Type Description
List<Object[]>