beyer@.erg.sri.com (beyer) (11/27/90)
> Subject: 300 Baud Speech Vocoding... > > I'm a little surprised no one has talked about the low data-rate > speech vocoding algorithms that have been developed. I am also interested in speech encoding algorithms. Specifically, I'm interested in low- to medium-rate algorithms (300 bps to 16 kbps) that have been implemented for real-time operation on off-the-shelf hardware (e.g., on the NeXT computer, or on DSP boards for the SPARCstation or the PC). I'd greatly appreciate receiving any information on such implementations that could be obtained with little cost. (I realize that understandable-quality, real-time, < 1 kbps encoding, on off-the-shelf hardware is probably asking too much.) For context: In a current research project, we are building a speech interface to variable data rate packet-switched networks (e.g., packet radio networks) that can adapt its encoding rate, possibly by switching between different encoding algorithms, according to the current throughput provided by the underlying network. Of course, any "software contributions" would be acknowledged. Thanks in advance for any information, Dave Beyer SRI International Menlo Park, CA 94025 beyer@sri.com (415) 859-6335