Reset the current phase (and optionnaly frequency) of a loop filter object.
lf = lf_reset(lf, phi); lf = lf_reset(lf, phi, nu);
Loop filter object
Initial phase, in radians
Initial frequency, normalized to sampling frequency (note: only applicable to a second order loop filter)
This function can be used for example just after initial phase and frequency estimation in a data preamble.