List: time-nuts@lists.febo.com
From: Poul-Henning Kamp
How to recognize a PLL...
Tue, Mar 15, 2005 9:50 PM
'z' becomes the estimate of frequency change over time [1/s^2] and
we use it to adjust y in addition to the integral of the phase:
y += (x - y) * t + z * c
and we steer the oscillator as before:
a * x + b * y
All there is left is to find good values for a, b, c, t & s.