AudioMasker Class Reference

#include <AudioMasker.H>

Inheritance diagram for AudioMasker:

List of all members.

Public Member Functions
	AudioMasker (int sampFreq, int fBankCount)
	AudioMasker (void)
	Audio masker constructor - allowing specification of fs and sub-band count later.
	~AudioMasker (void)
	Audio masker deconstructor.
void	excite (short int *Input, int sCount)
void	excite (double *Input, int sCount)
double	findThreshold (double freq)
Public Attributes
DepUKFB *	pfb
	roex filters

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Detailed Description

Audio masking class - top level Class to transform input audio in the time domain to a simultaneous audio mask in the frequency domain.

========================= HOWTO ===============================

// First find the masking threshold

AudioMasker masker(sampleFreq, count); // Create the audio masker class using fs=sampleFreq and count filters

masker.excite(input, sampleCount); // find the mask for the array of input data which has sampleCount time samples.

// Now do something with the masking threshold ...

// The frequency domain mask is now located here

for (int j=0; j<count;j++)

masker.mask[j]; // This is the mask at each of the count frequencies of interest

// A more sophisticated example - find the threshold for each Fourier bin

double fact=(double)sampleFreq/((double)sampleCount-1.0); // convert from an index to the equivalent Fourier bin frequency

for (int j=0; j<halfSampleCount;j++){

cout<<"finding for freq "<<j*fact<<''; // The frequency we are inspecting

double threshold=masker.findThreshold(j*fact); // The masking threshold

20*log10(threshold); // The threshold in decibels (dB)

}

Examples:

AudioMaskerExample.cc.

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Constructor & Destructor Documentation

AudioMasker::AudioMasker	(	int	sampFreq,
		int	fBankCount
	)

The Audio masking constructor @ sampFreq The sample frequency of the time domain data @ fBankCount The number of filter banks

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Member Function Documentation

void AudioMasker::excite	(	double *	Input,
		int	sCount
	)

Finds the excitation for input data @ Input Using double input data @ sCount samples

void AudioMasker::excite	(	short int *	Input,
		int	sCount
	)

Finds the excitation for input data @ Input Using short int input data @ sCount samples

These should be implemented differently for different Input types

Examples:

AudioMaskerExample.cc.

double AudioMasker::findThreshold

(

double

freq

)

Returns the simultaneous masking threshold at a particular frequency @ freq The frequency of interest

Examples:

AudioMaskerExample.cc.

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The documentation for this class was generated from the following files:

• AudioMasker.H
• AudioMasker.cc