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In this paper, the design of a computationally efficient variable bandpassdigital filter is presented. The center frequency and bandwidth of this filtercan be changed online without updating the filter coefficients. The warpedfilters, obtained by replacing each unit delay of a digital filter with anallpass filter, are widely used for various audio processing applications.However, warped filters fail to provide variable bandwidth bandpass responsesfor a given center frequency using first order allpass transformation. Toovercome this drawback, our design is accomplished by combining warped filterwith the coefficient decimation technique. The design example shows that theproposed variable digital filter is simple to design and offers a total gatecount reduction of 36% and 65% over the warped filters compared to the designspresented in [3] and [1] respectively

Design of Variable Bandpass Filters Using First Order Allpass Transformation And Coefficient Decimation