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From: | Jared Jensen |
Subject: | RE: [Discuss-gnuradio] DV Dongle - AMBE USB Device |
Date: | Wed, 19 Mar 2008 12:41:58 -0400 |
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. j0j > Date: Wed, 19 Mar 2008 09:02:46 -0700 > From: address@hidden > To: address@hidden > Subject: Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device > CC: address@hidden > > 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 > address@hidden > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio Connect and share in new ways with Windows Live. Get it now! |
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