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Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device |
Date: |
Wed, 19 Mar 2008 09:02:46 -0700 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
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] DV Dongle - AMBE USB Device, Eric A. Cottrell, 2008/03/18
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Rick Parrish, 2008/03/19
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Rick Parrish, 2008/03/19
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, David I. Emery, 2008/03/19
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Rick Parrish, 2008/03/20
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Jeff Brower, 2008/03/20
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Rick Parrish, 2008/03/21
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Jeff Brower, 2008/03/21
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, Rick Parrish, 2008/03/21
- Re: [Discuss-gnuradio] DV Dongle - AMBE USB Device, David I. Emery, 2008/03/21