December 5, 2005

Audio Source Location System Using Multiple Microphones

We created an SPI expansion board with a set of four microphones at 90 degree spaced angles, as well as software that performs a basic analysis of amplitude of microphone input levels to determine audio source direction relative to the plug. This expansion supplements the existing microphone.

Above: Amber speaks into microphone 0. We shielded our microphones with plastic cups.
Below: Screenshot of interactive visualization indicating direction of sound source.
Above: Oscilloscope reading different channels of audio.
Below: Early prototype