Any filter's group delay can be equalized by all pass filters.
Delay builds up at the filter corner. Since everything in the real world is
causal, you add delay outside that corner frequency but in the passband to
equalize it. This is to say, you can't remove delay, but just add it to
flatten out the group delay.
Yes, the compensation can be made and it has been also pointed out in the
first comment by Poul-Henning.
The only remaining question is, how stable are the analogue filter
parameters over time, to be compensated by fixed digital filter. It seems
to me, that some very small phase errors produced by such a filter-filter
mismatch may be acceptable.
At least for low-cost device which I would like to rebuild and offer for
WWVB audience (which is not present in our land).
Best regards,
Marek
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
