System for adjusting filters processing the composite video signal in a secam multistandard set

摘要

A system for adjusting filters processing the composite video signal in a multistandard set by determining the tuning phases during the quiescent phases of the composite video signal. A reference signal (fref) is applied to the filter during the tuning phases; a phase-locked loop supplies an error signal corresponding to the phase-shift of the filter; and means (14) are provided for storing the error signal of the phase-locked loop.