Mobile Science - AudioSpectrum




    AudioSpectrum displays the frequency spectrum of a WAV file or audio sourced from AudioTime or AudioTime+.

    The spectrum is displayed in linear and logarithmic scales.

    * Panning and zooming allow exploration of the fine details of the spectrum.
    * Ensemble spectral averaging is used to construct the spectrum of continuous audio too large for a single FFT transformation.

    The application is designed for use in science education experiments that:
    * investigate the frequency components of sound,
    * determine the dominant frequency of audio.

    Screen shots illustrate Doppler shift of sound source swinging on a pendulum.
    * First shot of stationary sound source spectrum centered closely around dominant frequency of 1838.
    * Second shot of moving sound source spectrum with lower frequencies as source recedes from microphone and higher frequencies as source approaches microphone.

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