[time-nuts] Effects of filter delay
Peter Vince
pvince at theiet.org
Sat Dec 23 17:58:38 EST 2006
Please forgive what is probably a naive question from this newbie,
but a loop filter has considerable delay (half the number of samples
for a typical(?) symmetrical FIR or block-averaging filter). This
must surely limit the usefulness of very long averaging times? And
perhaps it could exacerbate day/night changes by effectively applying
a "correction" of the wrong phase if averaging for a whole day was
attempted. Presumably you need a "crystal ball" subroutine to try
and predict what the trend is going to be in the future in order to
get your correction correct for "now"?
Peter
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