Pure Data

This is a video documentation of an audio feedback-based installation.

The core unit of this installation is the built-in audio system of a common computer, and a "seed": an application software implemented in Pure Data.

HOW IT WORKS

Audio feedback is the main principle involved.
The sound captured by the computer's microphone is digitally processed by means of: a band pass filter, a pulse width modulator, a granular synthesizer, and a stereo reverb, each one with the values of the main parameters randomly determined. Every 15 seconds, the application software turns on the microphone, raises the speaker's volume up to a value between 0.9 and 1, and changes randomly the values of the audio processes. After 15 seconds it turns off the microphone and lowers the speaker's volume down to 0 for 0.25 seconds. After that it restarts the cycle. In this way every 15 seconds a new larsen could happen (or not!). The sonic features of the sound event are determined by: the physics features of the computer's audio system; the values of the electroacoustic process; the specific nature of the environment where the installation takes place, the particular position of the computer in this space, the number of computers involved.
Each larsen is accompany with a colored light flickering on the computer screen in response to the audio feedback's raw pitch and amplitude.

INNER VOICES can be realized using minimum one computer up to any number of computers, by anyone, in any place, in any configuration, for any duration.

For the version documented in this video I’ve used 8 computers: 6 laptops with the built-in audio system; 1 laptop with the built-in microphone, external loudspeakers and video projector; 1 iMac with external microphone, external loudspeakers and subwoofer.

For more informations visit marcocecotto.com/works/inner-voices

Thanks to RIZOO GROUP for the support , and Samuele Grando (manocollective.com/) for the video.

j vimeo.com/62904221

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