Creating a Time-Varying Loudness Profile

This section assumes you have just created a cochlear excitogram in Octave as described in Section 4.1.

1. The first step in creating a time-varying loudness profile from a cochlear excitogram involves creating a specific loudness-gram. You can do this in Octave using the following command:

     > xSpecLoudgram = excitPat2SpecLoud(xExcitogram, bandCentersHz);
   

2. Second, to compute and plot the instantaneous, short-term, and long-term loudness profiles from the specific loudness-grams, issue the following command:

     > specLoud2LoudProf(xSpecLoudgram, bandCentersHz);
   

   A sample loudness profile, plotted in both sones and phons, is shown in Figure 6.

   Figure 6: Sample instantaneous, short-term, and long-term loudness profiles.