1. A method for filtering a signal to produce a filtered signal, the method comprising the steps of: determining a value of a variable parameter λ; determine a density generator vector ƒ={ƒ 1 ,ƒ 2 ,. .. , ƒ n }; constructing a q-measure based on the variable parameter λ and vector ƒ; and producing a filtered signal by filtering the signal based on the q-measure.