# libaudiomask - Simultaneous audio mask threshold estimation library

### 1.0

Authors:
  Dr Matt R. Flax <flatmax@>

## Academic

This code also implements the roex auditory filters.

Please read the article located on the debian file system file:///usr/shar/doc/libaudiomask-1.0/Flax.2000.Improved.Auditory.Masking.Models.pdf

It may also be found on the web http://www.assta.org/sst/SST-00/cache/SST-00-Chapter9-p2.pdf

## Introduction

This example shows how to use Dr M.R. Flax's (2000) hybrid simultaneous audio masking class to find the masking threshold of a time domain signal.

The compilation of this file is demonstrated in Makefile. Run this file : ./AudioMaskerExample View the results of this file using www.octave.org by running the script view.m

- simply type view once octave has started and you are in the suitable directory.

The input audio should be stored in the file INPUTFILENAME in text format - each sample seperated by a white space.

========================= 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<<'\t'; // The frequency we are inspecting
             double threshold=masker.findThreshold(j*fact); // The masking threshold
             20*log10(threshold); // The threshold in decibels (dB)
         }

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