FreeDV is open source. You can use the FreeDV API (http://www.rowetel.com/blog/?p=3469 <http://www.rowetel.com/blog/?p=3469>) or get a box that will implement it and can be updated with new protocols (http://www.rowetel.com/blog/?page_id=3902 <http://www.rowetel.com/blog/?page_id=3902>). Or you can download the FreeDV app. Or download the source, either one from here: http://freedv.org/tiki-index.php <http://freedv.org/tiki-index.php>
Dave Rowe (VK5DGR) is actively improving both the HF and VHF variants of FreeDV, with very interesting articles on his blog. He’s working on a low bitrate version for nasty HF signal paths (FreeDV 700), and is working on a VHF digital voice mode with two levels of fidelity always transmitted. When you get more signal, you get more fidelity (http://www.rowetel.com/blog/?p=3931 <http://www.rowetel.com/blog/?p=3931>). Here are some samples of the current 700 bitrate codec: http://www.rowetel.com/blog/?p=4291 <http://www.rowetel.com/blog/?p=4291> And some A/B comparison QSOs with SSB and FreeDV: http://www.rowetel.com/blog/?p=4527 <http://www.rowetel.com/blog/?p=4527> Dave is doing some very exciting stuff, I’m impressed. And it’s all free. wunder K6WRU CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 17, 2015, at 8:41 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > > There are advantages to digital voice, but for Amateur Band use, I don't > think we are "there yet". When we see an 'open source' digital voice mode > that is published and can be implemented by any amateur, then I may change my > position, but that is not the situation today. I do not believe that > proprietary modes of any sort should be permitted on the ham bands. > > One characteristic of digital streaming 'anything' is that if the signal > 'loses sync', things go to pot, and you have to wait until it syncs up again. > With fading on an analog signal, you can usually fill in the gaps, but with > digital, it is all or nothing. When it is "all", it is great, but the gaps > are annoying - plus the quality is determined by the bit rate in the > encoding/decoding algorithms. > > 73, > Don W3FPR > > On 9/17/2015 11:16 PM, Sandy wrote: >> I could not agree more Don! There isn't much advantage for amateur radio >> to digital voice operations. Just another "kink in the wire"! >> No advantage at all. All the digital voice stuff I have heard sounds >> terrible at times. Motorola's system (proprietary no doubt!) can sound >> absolutely awful when signal conditions are bad. >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wun...@wunderwood.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
