[RTTY] GRITTY

[Alex, VE3NEA]

Hi Tim,

You have done an interesting experiment with your Bayesian callsign correlator. I think your experiment failed only because your 
system missed one important element, a Bayesian squelch. I hope it will not be too difficult to modify your statistical model so 
that it includes silence in addition to the callsigns.

GRITTY has a small bug due to a last minute code change, this bug prevents squelch from working properly - that's why you can 
see so many CQ's and 599's decoded from the noise. This error is already fixed, a new build will be released shortly.

Another error I have fixed is unnecessary blank lines in the text, TNX to Salvo IW1AYD for bringing this to my attention.

73 Alex VE3NEA



On 2015-04-13 09:41, Tim Shoppa wrote:
> I played around just a little with GRITTY as a third decoder in EA RTTY
> contest weekend before last. (Running on an entirely different PC than my
> usual 2Tone and MMTTY instances).
>
> Watching it do its Bayesian magic and "back-correcting" sorta like CW
> Skimmer is really cool.
>
> The Bayesian smarts in it is really sore thumb obvious - it loves to look
> at band noise and print out "599" and "DE" and "QRZ" and "CQ" (which of
> course are exceedingly common in real contesting so of course a
> straightforward Bayesian approach will see all of them.)
>
> I tried to do something similar with Bayesian decoding last year, where I
> built an auto-correlator that looked for several thousand common RTTY
> contest callsigns culled from my RTTY contest logs. It of course ended up
> printing out well-formed commonly heard callsigns when fed band noise :-).
>
> I'm not sure I'm ready to add it to my "decoder lineup" yet but will be
> trying it out some more.
>
> Tim N3QE
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