RE: [Discuss-gnuradio] DV Dongle - AMBE USB Device

[Jared Jensen]

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
>
>
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