resampling wavefiles

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I needed to resample some wavefiles for a project. In first instance, I used Audacity (1.3.13-beta) running in a MacBook Pro. After finding many aliasing errors I went back to analyze the results of the resampling. Here some pics:

The results with  Audacity ® 1.3.13-beta (Unicode) and Matlab are much noisier than those obtained with Praat.

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