A Novel Implementation of Reconfigurable Warped Digital Filters

A novel implementation of reconfigurable warped digital filter with variable low-pass, high-pass, band-pass, and band-stop responses is presented in this project. A Comparison between reconfigurable warped digital filter combined with CDM technique and reconfigurable warped digital filter designed with Low-Power and Area-Efficient Carry Select Adder combined with CDM technique is presented in this paper. The warped filters, obtained by replacing each unit delay of a digital filter with an all-pass filter, are widely used for various audio processing applications. However, warped filters require first-order all-pass transformation to obtain variable low-pass or high-pass responses, and second-order all-pass transformation to obtain variable band-pass or band-stop responses. To overcome this drawback, the method combines the warped filters with the coefficient decimation technique(CDM). The architecture which is proposed provides variable low-pass or high-pass responses with fine control over cut-off frequency and variable bandwidth band-pass or band-stop responses at an arbitrary center frequency without updating the filter coefficients or filter structure. The design example shows that the proposed variable digital filter is simple to design and offers substantial savings in power consumption over other approaches.