Testing ALL The FREEDV Modes - But which one sounds best? 

The only thing missing is an audio transmission between your radio and Jonathan's radio to get an idea of what the sound quality is between your stations on FM with the analog signal

There are audio loopback examples available within GNU Radio Companion for both FreeDV and Codec2.

Interesting comparison. You can understand what's being said and can identify the speaker. All sound robotic, like over-compressed MP3. You pay your money and you get your bit rate. 🙂 I work with VoIP systems and we use G.729 as our codec. Now that the patents have expired there are no licensing issues.

Honestly I struggled to make out what he said on most of those but 2020. For vhf/uhf I’ve had much clearer audio via FM or even YSF

No doubt room for improvement. I do believe that P25 is far better, of course using Motorola XTL5000 radio's, on VHF/UHF. Not sure if their protocol is available/open source. I must say, a few years ago, I came across a fellow in Australia that was working on a HF digital voice project, developing the code, a few years ago, seemed promising, unfortunately can't recall who he was, nor could I find the documentation on my computer. Could be possibly, in QEX?? Good work as usual Mat, you are definitely an asset to the Amateur Radio Community! I've been a ham since the early 70's, (Rf Engineer since '80's, radio has been my life since the late 60's!) nice to see that someone is taking the time to inform/educate the radio community, and that you have a following. A lost tradition over the decades! You dedicate plenty of time in doing so, my respects to you, and by the way, as usual, thumbs up! HI-HI! 73's Dale ve3aam

Fascinated and definitely will be looking into this! Thanks!

Well done Mat and Jonathan! Current state of the DV art for hams is not quite viable. As newer technology comes available (obsolete for cell phones, but good for us), I think we will see dramatic improvements. As I said on Mat's channel, compare the first digital cameras with what we have now. Remember all the guys who said film will always be superior? 73, Len, KD0RC

can u test on hf band in SSB?

Ever since Dstar came out I’ve wondered why anybody would want their voice to sound that bad. These modes just demonstrated are no better and I sure can’t see any reason for their use.

To me, this sounded more like a data loss/corruption demo than a test of encoding methods.

Love your videos. Keep up the good work. Are you working on a review of the the new tidradio td-h3?

There are already too few digital mode operators, and now when you want to operate with freedv you have to make a choice between incompatible modes 🤷‍♂️

I wanted to use this on fm. The developer made for hf modes. But he said would work. I know one of the project people on freedv.

I do like to hear it on using it at SSB, both as a strong signal, and with a low SNR, to hear how godt it will perform on a god and low SNR, with the limited band with ??

Slightly choppy and garbled! Thats a understatement.. 😅

Appreciate the info and research.

Be interesting to see that same test with a more stronger signal between both stations and different modes ssb and FM, 2020 did sound better.

2020C sounds best, but it's removed in the acutal versions, didn't had this garble with 2020C compared to 2020

Can I use it with rtl-sdr to pure decoding incoming signals?

They all sounded equally poor to me. Needs lots of improvement to become something for every day use.

Freedv is developing a new board it will be available in a few no months. For about $100. Use with out internet.

Both released your videos n nearly at the same time

The problem with most digital modes is the instability of audio frequencies during vowel sounds. This makes it extremely confusing and cognitively demanding to listen to. The 2020 was maybe a bit better in that respect.

Yes I can hear you Clem Fandango! :)

To everyone commenting, don't like it. Move on, it's not for you.

Odd that multiple U Tubers all post similar subject matter videos within the same day/s as each other 🧐

I have done a fair bit of playing with FreeDV in the past, and for whatever reason, my results appear to be a lot better than yours here. And interestingly, I was doing this over SSB on HF. Maybe a re-test is needed on this one Matt? I have found it to be a really fun and impressive mode, but unfortunately this video paints the FreeDV mode in a fairly bad light, possibly unfairly.

Apart from the 2020, they are all extremely tiring to listen to.

Digital voice has loooong way to go to be honest. Hard to listen to for any length of time. Never used DStar or DMR.. they sound the same?

Personally why is it we have to do digital over analog rdio . and overall it cuts hams out of communications if they dont have freedv. this is where thigns are getting out of hand. .

horrible decoded audio even in 2020 mode. I did a similar exercise a few years ago on 10M SSB with similar results. Basically, the analogue audio is much better than the decoded digital even with noise present. What I noticed too is just how strong the signal has to be to get good copy. I'm no expert but the 2020 modes sounded like there had been some data loss and that's at S5 on FM when I'd expect to get perfectly readable analogue audio. I've been following the progress of FreeDV and Codec 2 for years and I really want this stuff to work properly but, to my tired old ears, it's still not there yet

None. Is anyone going to make a digital voice mode that doesn't sound like crap?

None of these modes are acceptable for me.

A solution searching for the problem.