Low complexity implementation of variable band filters using filters banks

摘要

The paper introduces an innovative method for variable passband filters synthesis using filters banks. This techniqueudallows a fast filter passband modification with a low complexity implementation. This method, called Rcos,udhas been designed by deeply analysing the DFT (Discrete Fourier Transform) method, and the OLS (Overlap Save)udmethod. By introducing an appropriate weighting during the selection of the elementary frequency bands whichudbelong to the desired filter, it is possible to reduce the aliasing effect due to the time varying behavior of the filter,udand to obtain a simple and efficient method which has a lower complexity than that of OLS. The paper’s contributionudis the analysis, the development and the comparison between the different methods.