Espectograma

[NSD]

Pudes usar webaudio en html5:
https://github.com/lontafara/El-audio-en-la-web
https://developer.mozilla.org/en-US/...rum-visualizer
http://www.smartjava.org/content/exp...ualizing-sound
http://www.sitepoint.com/5-libraries-html5-audio-api/
https://developer.mozilla.org/en-US/.../Web_Audio_API
http://www.html5rocks.com/en/tutorials/webaudio/intro/
http://www.w3.org/TR/webaudio/