Seeing Sounds

OK, so...

Yeah, that's the best way I can think to sum up my current idea for the final... I'm tryna create some sort of device that links sounds and colors.

I was thinking there would be some sort of microphone sensor that would detect voices, and be able to differentiate between high and low pitches. I want to somehow (probably need to use processing for this...) make it so that different pitches correlate to different colors-- like maybe high to medium pitches return red, orange, and yellow/yellow-green, and medium pitches to low pitches return green, blue, and violet tones.

These colors would be displayed on an onscreen blank white "canvas". Wherever the mouse is on the screen when a person speaks into the device, a color relating to the pitch of their voice would be placed (5 pt. circle brush or something like that) on the mouse's position. So if you spoke into it while moving the mouse, you could create lines or shapes of color. You would be able to create entire paintings based off of sound--your voice.

The only thing is how to keep it from picking up stray sounds in the surrounding environment. Maybe it belongs in a quiet, solitary place where only one person at a time can use it. Also, it would probably take a long time but I don't just want there to be six colors returned, I want it to slowly transition between all of them, so we get a wide range of colors to match the wide range of sounds--so instead of just red, blue, yellow, etc. there's hundreds of in between tones like magenta, turquoise, indigo, midnight blue, etc. It's... gonna be hard.