This book is a collaboration of researches by renowned experts in the field of adaptive filtering. This system is used to characterize unfamiliar systems in time-variant surroundings. The main purpose of this method is to combine highest convergence speed with maximum accuracy. Every function requires a definite approach which determines the filter composition, the cost function to reduce the judgment error, the adaptive algorithm, and other parameters; and each selection involves certain cost in computational terms, that in any case should consume less time than the time necessary by the application functioning in real-time. This book is a compilation of various aspects related to adaptive filtering and it intends to help researchers in a productive manner.