Mobile Science - AudioSpectrum

Frequency spectrum of WAV file or audio sourced by AudioTime or AudioTime+ apps.

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.