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From: tj@xn.ll.mit.edu (Thomas E. Jones)
Newsgroups: comp.dsp
Subject: 300 Baud Speech Vocoding...
Message-ID: <1990Nov15.231800.119@xn.ll.mit.edu>
Date: 15 Nov 90 23:18:00 GMT
Organization: MIT Lincoln Laboratory
Lines: 20

I'm a little surprised no one has talked about the low data-rate
speech vocoding algorithms that have been developed.

Here at the laboratory, we implemented a real-time 300 Baud algorithm
developed at BBN called an LPC segment vocoder.  Yes, it takes a lot
of computation to do it in real time, and a lot of computer hardware,
but shows that low data rates are possible, and there remains lots of
work to be done on improving these.

A new vocoding algorithm known as Sinusoidal Coding has been
developed by the same group at Lincoln Lab., and offers much better voice
quality than LPC.

I'm no expert in this area, but can point people toward references if
anyone's interested.

				- tj@xn.ll.mit.edu
-- 
tj@xn.ll.mit.edu or tj@ll-xn.arpa          (one of these should work)
Thomas E. Jones, home (617) 924-8326 work (617) 981-5093