There is not an infinity of good sync words. A typical good sync word has a high positive autocorrelation when synced, sloping downwards monotonically.
Thus the cross-correlation of the received word with a locally stored reference can be used to steer the loop using a small dither and a lock-in technique. -John ================ > Hi > > The gotcha is that they may change the sync word based on test data. They > may also tweak other vague points in the spec based on the troubles they > run into in their tests or with their silicon. > > Bob > > On Jul 8, 2012, at 8:07 PM, Magnus Danielson wrote: > >> On 07/09/2012 12:46 AM, paul wrote: >>> >>> Peter indeed there could be >>> But it should not need to be decoded to undo the psk. >>> Plus documentation lacks some of the details I think to actually do it. >>> But that would be a significant project since the formats not been >>> settled completely yet. >> >> I have looked at the PTTI 2011 paper (wwvb.pdf) and much of a format is >> being shown. Has anyone established the 14 bit sync-word and verified >> the format? It seems that aligning up with the normal AM broadcast >> should be possible. >> >> Can someone record it as it has been reduced to say 2 kHz and analyze >> the produced audio file? Recoding with 48 kHz sampling rate should allow >> almost trivial 2 kHz I-Q demodulation to illustrate phase swaps. >> >> Cheers, >> Magnus >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.