Hi David. I think all of us that are trying (I'd hope) are experimenters in
the best spirit of it. I'd like to also suggest people receiving any of the
real world tests right now should somehow make the files available (maybe
one of us can make an FTP area or PHP uploader) since the more examples you
have, the more tweaking you can do.
However I thought it performed very well when I mixed assorted HF channel
noise at various amplitudes especially considering the lack of FEC. Also
the fact Philip was able to even make 3 words from a recording taken from a
web SDR (think compressed audio) with seriously strong LSB interference is
a pretty good result.
I'll for sure keep testing. And any signals I capture I'll also upload in
order to provide more data for future improvements.
To reiterate though it's pretty damn good so far.
Best regards,
Peter M6DGI
On May 12, 2012 11:17 PM, "David Rowe" <[email protected]> wrote:
> Hi Guys,
>
> Just wanted to point out that the current codec-modem system hasn't been
> tuned for real HF channels yet, for example you will get R2D2 noises if
> the modem can't find the signal or during fades. However it's a good
> starting point and should work OK on good SNR channels.
>
> I would be interested to see how the modem performs over various real
> world channels, even with the test data frames.
>
> I also have a small database of speech samples that "break" the Codec
> (i.e. sound relatively poor compared to some other source material), I
> will like to work through them and see what I can do.
>
> Cheers,
>
> David
>
>
>
>
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