Class SpectrogramMelScale

Inheritance
Object
BaseSonogram
SpectrogramMelScale
Inherited Members
Namespace: AudioAnalysisTools.StandardSpectrograms
Assembly: AudioAnalysisTools.dll
Syntax
public class SpectrogramMelScale : BaseSonogram

Constructors

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SpectrogramMelScale(AmplitudeSonogram)

Declaration
public SpectrogramMelScale(AmplitudeSonogram sg)
Parameters
Type Name Description
AmplitudeSonogram sg
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SpectrogramMelScale(AmplitudeSonogram, Int32, Int32)

Declaration
public SpectrogramMelScale(AmplitudeSonogram sg, int minHz, int maxHz)
Parameters
Type Name Description
AmplitudeSonogram sg
Int32 minHz
Int32 maxHz
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SpectrogramMelScale(SonogramConfig, WavReader)

Declaration
public SpectrogramMelScale(SonogramConfig config, WavReader wav)
Parameters
Type Name Description
SonogramConfig config
WavReader wav
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SpectrogramMelScale(String, WavReader)

Declaration
public SpectrogramMelScale(string configFile, WavReader wav)
Parameters
Type Name Description
String configFile
WavReader wav

Methods

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GetMelGridLineLocations(Int32, Int32, Int32)

THIS METHOD NEEDS TO BE DEBUGGED. HAS NOT BEEN USED IN YEARS! Use this method to generate grid lines for mel scale image Currently this method is only called from BaseSonogram.GetImage() when bool doMelScale = true; Frequencyscale.Draw1kHzLines(Image{Rgb24} bmp, bool doMelScale, int nyquist, double freqBinWidth).

Declaration
public static int[, ] GetMelGridLineLocations(int gridIntervalInHertz, int nyquistFreq, int melBinCount)
Parameters
Type Name Description
Int32 gridIntervalInHertz
Int32 nyquistFreq
Int32 melBinCount
Returns
Type Description
Int32[,]
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GetStandardMelScale(FrequencyScale)

WARNING: This method assigns DEFAULT parameters for MEL FREQUENCY SCALE. It works only for "standard" recordings, i.e. sr = 22050 and frame = 512. The default MelScale has 64 frequency bins. The Linear500-octave scale is almost similar and has 66 frequency bands. Currently, the MEL scale is implemented directly in MakeMelScaleSpectrogram() method.

Declaration
public static FrequencyScale GetStandardMelScale(FrequencyScale scale)
Parameters
Type Name Description
FrequencyScale scale
Returns
Type Description
FrequencyScale
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Make(Double[,])

Converts amplitude matrix to mel-frequency scale spectrogram. IMPORTANT NOTE: The conversion to Mel-scale is done BEFORE noise reduction. And conversion to decibels is done after noise reduction.

Declaration
public override void Make(double[, ] amplitudeM)
Parameters
Type Name Description
Double[,] amplitudeM

Matrix of amplitude values.
Overrides
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MakeMelScaleSpectrogram(SonogramConfig, Double[,], Int32)

Converts an amplitude spectrogram to mel-scale spectrogram. NOTE 1: This method assumes that the entire spectrum ispassed to filter bank. NOTE 2: The decibel array has been normalised in 0 - 1.

Declaration
public static double[, ] MakeMelScaleSpectrogram(SonogramConfig config, double[, ] amplitudeM, int sampleRate)
Parameters
Type Name Description
SonogramConfig config
Double[,] amplitudeM
Int32 sampleRate
Returns
Type Description
Double[,]

Extension Methods