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Cysip DSP Courses
http://www.cysip.com/
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These folks offer some seminars on communcations (at Arisona State University). On their page, if you go to the links to free software, you will find Matlab code for CELP and LPC Vocoders (FS-1016 and lpc10e). This same page also has a wide variety of links for speech coding stuff.
Other links to site cysip.com: