Again with the brainwaves

I’m still playing around with the EPOC neuroheadset by Emotiv, as described in previous posts, such as Realtime Brainwave Data with WPF and Fun with brainwaves, part 3: Here’s some code. This time, I’m converting brainwaves into soundwaves in realtime (well, near-realtime).

I’ve built a simple signal processing pipeline, and I feed it signals from the EPOC’s neurodata stream. Once the brainwaves are transformed into frequency space, I do some filtering and then emit an audio signal that’s synthesized by using an inverse FFT. The raw sine waves are a bit brutal on the ears, so I also drive the MIDI device with pitches that corresponding to various brainwave frequencies. This produces some interesting sci-fi sound effects that resemble the score to the last act of 2001: A Space Odyssey.

Here’s a quick video that demonstrates the signal pipeline in action.

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