Not clear on where M17 fits into the firmament.
o D-STAR (JARL copyright, Icom trademark) - a stream protocol that
uses AMBE to digitize the voice part of the stream and wiggles the
electrons as GMSK.
o YSF (presumably copyrighted and trademarked by Yaesu) - a protocol
(is it a stream or packetized) that uses AMBE+2 to digitize the voice
part of the stream and wiggles the electrons as C4FM.
o DMR (copyrighted by ETSI and maybe trademarked by them too) - a
protocol (is it a stream or packetized) that uses AMBE+2 to digitize
the voice part of the stream and wiggles the electrons as 4FSK (and
TDMA to boot).
See if I have this right:
o M17 - a protocol (stream? packetized?) that uses CODEC2 to digitize
the voice part of the stream and wiggles the electrons as ????.
IMBE, AMBE, AMBE+, and AMBE+2 are all the IP of DVSI, Inc. It's
unclear to me (K6BP probably knows! see below) whether or not the
patents on the first two have expired or not. CODEC2 is not
encumbered by patents and, for everything I've seen, actually superior
to at least the older versions of DVSI's work (meaning that we would
really like to use it for *two* reasons. :-) )
So, leaving IP aside, do I have the basics of M17 right - it's a
protocol that uses CODEC2 to digitize voice?
This is already 10 years old -
- I'll
see if Bruce has updated it.
--
Peter Laws | VE[23]UWY / N5UWY | plaws0 gmail com | Travel by Train!
Peter Laws