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Re: [Discuss-gnuradio] Proposal Draft: Next Generation Digital Voice Cod
Re: [Discuss-gnuradio] Proposal Draft: Next Generation Digital Voice Codecs and Vocoders for Amateur Radio
Wed, 14 May 2008 18:56:52 -0700
Mozilla-Thunderbird 220.127.116.11 (X11/20080509)
Gregory Maxwell wrote:
Would this be useful to solve the garble problem when there's a
firefighter with a loud chainsaw in the background? That just kills the
codecs they use on APCO 25 right now.
We've been working on a new lowlatency codec for speech and music,
CELT, and are about to public a paper on it. (celt-codec.org).
While CELT wouldn't be useful for narrowbanded voice some of the
components of CELT would be very useful in an AMBE killer.
(Particularly CWRS, the algebraic vector quantizer). CELT itself
could be used for a 10-20khz wide mode (40-60kbit/sec with decent SNR)
to replace FM with something with much greater quality if there was
interest... But a lower bandwidth mode will be far more interesting.