[time-nuts] Effects of filter delay

[Peter Vince]

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