For a walking robot installation – with the intention to react to humans – I made a system to calculate the direction of the source of sound. To achieve this, two microphones were used, and mounted 50cm apart from each other. The delay in arrival of the sound is input for the direction, and was calculated using a real-time Fast Fourier Transform.
The direction was displayed with a Servo system and a handle rotating to successfully point the direction.
The system was integrated into the Halobject.