Interesting
http://hackaday.com/2013/05/22/adding-stereo-to-monophonic-audio/
-Original Message-
From: Hack a Day [mailto:comment-re...@wordpress.com]
Sent: Wednesday, May 22, 2013 8:00 AM
Subject: [New post] Adding stereo to monophonic audio
Post : Adding stereo to monophonic audio
URL: http://hackaday.com/2013/05/22/adding-stereo-to-monophonic-audio/
Posted : May 22, 2013 at 8:00 am
Author : Brian Benchoff
Tags : binarual recording, binaural, head transfer function, recording,
stereo
Categories : digital audio hacks
http://hackadaycom.files.wordpress.com/2013/05/board.jpg
A lot of awesome stuff happened up in [Bruce Land]'s lab at Cornell this last
semester. Three students - [Pat], [Ed], and [Hanna] put in hours of work to
come up with a few algorithms that are able to simulate stereo audio with
monophonic sound
(http://people.ece.cornell.edu/land/courses/ece5030/FinalProjects/s2013/pmd68_ecs227_hl577/pmd68_ecs227_hl577/index.html)
. It's enough work for three semesters of [Dr. Land]'s ECE 5030 class, and
while it's impossible to truly appreciate this project with a YouTube video,
we're assuming it's an awesome piece of work.
The first part of the team's project was to gather data about how the human ear
hears in 3D space. To do this, they mounted microphones in a team member's ear,
sat them down on a rotating stool, and played a series of clicks. Tons of
MATLAB later, the team had an average of how their team member's heads heard
sound. Basically, they created an algorithm of how binaural recording
(http://en.wikipedia.org/wiki/Binaural_recording) works.
To prove their algorithm worked, the team took a piece of music, squashed it
down to mono, and played it through an MSP430 microcontroller. With a good pair
of headphones, they're able to virtually place the music in a stereo space.
The video below covers the basics of their build but because of the limitations
of [Bruce]'s camera and YouTube you won't be able to experience the team's
virtual stereo for yourself. You can, however, put on a pair of headphones and
listen to this (http://www.youtube.com/watch?v=IUDTlvagjJA) , a good example of
what can be done with this sort of setup.
Read more of this post
(http://hackaday.com/2013/05/22/adding-stereo-to-monophonic-audio/#more-98294)
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