Filtering of narrowband signals using analytic sianal properties

A system used to separate and to track slow variations of the amplitudes, the frequencies and the phases of a reduced number of added sinusoids is presented. The principal difference with other methods as the adaptive line enhancement is that the signal used to reduce almost to zero the difference between the input and the estimates is synthesized from separates sources of sinusoidal signals controlled by the product of the error and the estimates and integrated in a similar fashion as the adaptive filter but using discrete PLL´s to follow the phase of each component. As a collateral result we present two new DPLL´s using only equispaced data to control the VCO frequencies of the PLL´s.