Class SpectralPeakTracks

Finds and stores info about spectral peak tracks ie whistles and chirps in the passed spectrogram.

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

Constructors

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SpectralPeakTracks(Double[,], Double)

Initializes a new instance of the SpectralPeakTracks class. CONSTRUCTOR NOTE: Orientation of passed spectrogram is: row = spectral frames, columns = frequency bins.

Declaration
public SpectralPeakTracks(double[, ] dBSpectrogram, double peakThreshold)
Parameters
Type Name Description
Double[,] dBSpectrogram
Double peakThreshold

Properties

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Peaks

Declaration
public double[, ] Peaks { get; }
Property Value
Type Description
Double[,]
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RhzSpectrum

Gets spectrum of horizontal ridges.

Declaration
public double[] RhzSpectrum { get; }
Property Value
Type Description
Double[]
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RngSpectrum

gets spectrum of negative slope ridges.

Declaration
public double[] RngSpectrum { get; }
Property Value
Type Description
Double[]
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RpsSpectrum

Gets spectrum of positive slope ridges.

Declaration
public double[] RpsSpectrum { get; }
Property Value
Type Description
Double[]
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RvtSpectrum

Gets spectrum of vertical ridges.

Declaration
public double[] RvtSpectrum { get; }
Property Value
Type Description
Double[]
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SptSpectrum

Gets the fractional peak cover; i.e. fraction of frames in freq bin that are a spectral peak.

Declaration
public double[] SptSpectrum { get; }
Property Value
Type Description
Double[]
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TrackDensity

Gets average number of tracks per frame.

Declaration
public double TrackDensity { get; }
Property Value
Type Description
Double

Methods

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CalculateSpectralPeakTracks(AudioRecording, Int32, Int32, Int32, Boolean, Double)

CALCULATEs SPECTRAL PEAK TRACKS: spectralIndices.SPT, RHZ, RVT, RPS, RNG This method is only called from IndexCalulate.analysis() when the IndexCalculation Duration is less than 10 seconds, because need to recalculate background noise etc. Otherwise the constructor of this class is called: sptInfo = new SpectralPeakTracks(decibelSpectrogram, peakThreshold); NOTE: We require a noise reduced decibel spectrogram FreqBinWidth can be accessed, if required, through dspOutput1.FreqBinWidth.

Declaration
public static SpectralPeakTracks CalculateSpectralPeakTracks(AudioRecording recording, int sampleStart, int sampleEnd, int frameSize, bool octaveScale, double peakThreshold)
Parameters
Type Name Description
AudioRecording recording
Int32 sampleStart
Int32 sampleEnd
Int32 frameSize
Boolean octaveScale
Double peakThreshold
Returns
Type Description
SpectralPeakTracks
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ConvertSpectralPeaksToNormalisedArray(Double[,])

This method only called from Indexcalculate when returning image of the sonogram for the passed recording segment.

Declaration
public static double[] ConvertSpectralPeaksToNormalisedArray(double[, ] spectrogram)
Parameters
Type Name Description
Double[,] spectrogram
Returns
Type Description
Double[]
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GetDefaultRidgeKeys()

Declaration
public static string[] GetDefaultRidgeKeys()
Returns
Type Description
String[]
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GetPeakTracksSpectrum(Double[,], Double)

Calculates spectral peak tracks.

Declaration
public void GetPeakTracksSpectrum(double[, ] dBSpectrogram, double dBThreshold)
Parameters
Type Name Description
Double[,] dBSpectrogram

typically a decibel noise-reduced spectrogram.
Double dBThreshold

threshold for spectral peak to be a valid peak.
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GetRidgeSpectraVersion1(Double[,], Double)

Declaration
public void GetRidgeSpectraVersion1(double[, ] dbSpectrogramData, double ridgeThreshold)
Parameters
Type Name Description
Double[,] dbSpectrogramData
Double ridgeThreshold
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GetRidgeSpectraVersion2(Double[,])

Declaration
public void GetRidgeSpectraVersion2(double[, ] dbSpectrogramData)
Parameters
Type Name Description
Double[,] dbSpectrogramData
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LocalSpectralPeaks(Double[,], Double)

Finds local spectral peaks in a spectrogram, one frame at a time. IMPORTANT: Assume that the spectrogram matrix is oriented 90 degrees to visual orientation. i.e the rows = spectra; columns = freq bins.

Declaration
public static double[, ] LocalSpectralPeaks(double[, ] dBSpectrogram, double dBThreshold)
Parameters
Type Name Description
Double[,] dBSpectrogram
Double dBThreshold
Returns
Type Description
Double[,]

Extension Methods