Post : Arduino voice changer turns you into [Vader]
URL : http://hackaday.com/2012/10/12/arduino-voice-changer-turns-you-into-vader/
Posted : October 12, 2012 at 10:01 am
Author : Brian Benchoff
Tags : adafruit wave shield, arduino, halloween, voice changer
Categories : Holiday Hacks, musical hacks

http://hackadaycom.files.wordpress.com/2012/10/vader.png

Halloween is just around the corner, so of course we're looking forward to a bunch of awesome costumes put together by Hackaday readers. In an effort to match his voice to his costume, [Phil Burgess] over at Adafruit (and former Hackaday alumnus) put together an Arduino-powered voice changer (http://learn.adafruit.com/wave-shield-voice-changer/overview) to give his voice the gravitas of [James Earl Jones] or the lightheartedness of a member of the Lollipop Guild.

If you've ever played with a turntable, you'll know playing a 33 RPM record at 45 or 78 RPM turns your treasured copy of Dark Side of the Moon into a lighthearted aural experience with a pitch that is much too high. Likewise, playing a single at 33 or 16 RPM means those once dulcet tones are now recordings of tormented souls in an acoustic hell.

[Phil]'s voice changer operates on the same principle by recording sounds from a microphone into a circular array (http://en.wikipedia.org/wiki/Circular_buffer) Â and playing them back at a different rate; faster if the desired effect is a Munchkin, and slower if this year's Halloween costume will be a Sith lord.

The completed build incorporates a 10k pot to dynamically change the timbre of the voice changer, as well as an Adafruit Wave Shield (http://adafruit.com/products/94) to play back a few pre-recorded sounds of lightsabers clashing. In all, a very cool project for your Halloween costume that's also a very good introduction to DSP and real-time audio modifications with a microcontroller.

Read more of this post (http://hackaday.com/2012/10/12/arduino-voice-changer-turns-you-into-vader/#more-87882)

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