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| To examine a sound file further using matlab: |
Download the wav file to be examined
Download the matlab files given here into the directory where the downloaded wav file resides.
Run play_filtered_file within matlab and answer questions as they arise. Initially a pop-up box will allow you to choose the file you wish to examine. Note that you will be asked for low and high frequencies of the filter to be used. The low frequency used should not be less than 10 Hz, the high frequency used should not exceed 10000 Hz. USER BEWARE - If too narrow a frequency range is used the matlab code will give erroneous results (this condition will be obvious).
Note that the matlab file produces a figure that shows the filtered, 30 second, wav file and then a time/frequency plot of the filtered wav file. It also plays the filtered wave file.
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data_filtering.m