I was given a speech signal corrupte by an awgn. I need to demodulate and clean the signal. Can anyone help me?

Thanks

 

Probably, but you will need to give more details about the format of the speech signal.

Dave

 

awgn = Additive, White Gaussian Noise.

What is the modulation technique? AM, FM, or other?

 

http://gwc.sourceforge.net/gwc_science/node4.html

You can look for a wavelet toolbox for matlab according to this:
http://www.dsprelated.com/showmessage/76329/1.php

These seem to be free
http://www-dsp.rice.edu/software/rwt.shtml
http://www.math.rutgers.edu/~ojanen/wavekit/
http://www-stat.stanford.edu/~wavelab/
http://scwt.sourceforge.net/

Some freeware
http://www.toolsmiths.com/p/wavbox.aspx

More: deleted ieeexplore as being useless lackwitted imbeciles.
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:unofficial&hs=u7M&q=+matlab+wavelet+toolbox+-ieeexplore&btnG=Search