Reconfigurable and low complexity variable digital filter design

This paper describes a reconfigurable hardware Implementation for variable low pass, high pass, band pass and band stop FIR filters. The proposed implementation is based on a MUX based structure for various tap selection, and LUT based approach to select required configurations for each responses .In this way the arithmetic complexity will be reduced. The warped filters, obtained by replacing each unit delay of a digital filter with an all-pass filter, which are widely used for various phase shifting and time delay applications. However, warped filters require first-order and second order all-pass transformation to obtain variable low-pass or high-pass responses, band pass or band stop responses. Here we combine warped filters with the coefficient decimation technique. The proposed architecture is verified through functional verification with the filter coefficients or filter structure.