Spectral Power Display

    spectralPowerDisplay1 jpg

    Introduction

    This utility is used to examine the spectral power of a segment of speech. Above we are looking at the beet portion of the "beetbatbootbird.wav" file. Actually, it is the ee portion of beet, which is traditionally denoted by /i/. The /i/ section is selected by the red and blue veritical lines with boxes attached. Below we see the /ae/ selection of bat of the same file. (The /ae/ is the traditional way of denoting the a sound of bat) Note that we can visually estimate the formants of the given speech segment. (Recall, the formants are the peaks, the first peak is f1, etc.) For example in the above we visually estimate that f1=300 hz and f2=2500 hz for the sound /i/ Below, for /ae/ sound we see f1=800 hz and f2=1700 hz.

    spectralPowerDisplay2 jpg

    Finally, just as a sanitity check, we feed it a sine wave at 4000 hz which was generated by speakEasy.rb. Below is the result. (Note the lobes)

    spectralPowerDisplay4 jpg


    Features:

    • open
    • play
    • stop
    • clear graph
    • about
    • show spectrum of selection