Jared- > speex is nice. I've used it as well as the AMBE2000/2020. I wasn't in love > with > the AMBE. We ended up doing lots of hacking to make the DVSI AMBE 2000/2020 > pair > of DSPs work in our application. Specs were light and idiosyncrasies were > numerous.
What was the lowest bitrate you used with Speex? My understanding is that Speex's PESQ scores are below 3 for anything below 3000 bps. -Jeff > > Date: Wed, 19 Mar 2008 09:02:46 -0700 > > From: [EMAIL PROTECTED] > > To: [EMAIL PROTECTED] > > Subject: Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device > > CC: discuss-gnuradio@gnu.org > > > > On Wed, Mar 19, 2008 at 07:02:08AM -0600, Jeff Brower wrote: > > > Rick- > > > > > > > > I am also thinking of writing a APCO P25 Voice to AMBE2000 frame > > > > > converter > and see > > > > > if the device can decode P25 as well. This may be a general IMBE and > > > > > AMBE codec. > > > > > > > > > > > > > I hope so. I looked at this a while back. What concerned me most was the > > > > AMBE2000/2020 documentation seemed to omit P25 style IMBE compatibility. > > > > Compare the docs to another DVSI product - the VC55 - to see what I > > > > mean. > > > > > > If you're looking at low bitrate codecs for GNU radio, why use a hardware > (dongle) > > > dependent solution? You might look at MELPe, which provides 600, 1200, > > > and 2400 > bps, > > > and can be implemented as a software solution. MELPe is a US/NATO standard > (STANAG > > > 4591). Common applications are HF radio and L band satellite apps where > bandwidth is > > > very limited. > > > > > > -Jeff > > > > Unless something has changed, MELP is also encumbered. How about a > > free codec, such as speex? http://www.speex.org/ > > > > Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio