Subject: Sound energy to charge mobile phones?

Hi 

This is in continuation to:
http://www.madsci.org/posts/archives/2006-04/1145316546.Ph.r.html

Can mobile phones be charged (to a small extent) by using sound to electrical 
transducers? There are two reasons I am asking this:
[1] The dispersion of sound will be lesser as the distance of mouth is close 
to the mobile.
[2] The more a person talks, the more it can get charged. So it gets charged 
as per usage.

Assumptions: 
[1] I am considering very basic mobile phones which dont have any multimedia 
features etc., which means lesser battery consumption.
[2] I am mentioning this as an complement to Solar mobile phones chargers.

Thanks
Niket.

Re: Sound energy to charge mobile phones?