Design, analysis, and ECG subband processing application of new M-channel cosine modulated uniform filter banks based on exponential window family

In this study, a new method for the design of M-channel cosine modulated uniform filter banks with near perfect reconstruction is presented. In this proposed method, the exponential window is used for the design of prototype filter of the filter banks. Performance of the proposed system has been analyzed in terms of amplitude and aliasing errors by making designs for different channel numbers, minimum stopband attenuations, and filter lengths. Later, as a design example, a cosine modulated filter bank having 32-channel and a stopband attenuation with 100 dB is designed by using the proposed method and compared with Kaiser window based Lin's method. In addition, the filter banks designed by the proposed method and Lin's method are compared in terms of the amplitude and aliasing errors for different channel numbers, minimum stopband attenuations, and filter lengths. Finally, performances of the filter banks designed by the proposed method and Lin's method on subband processing application of various electrocardiogram (ECG) signals are investigated. Simulation results demonstrate that the filter banks designed by proposed method can exhibit better performance than the ones designed by Lin's method in terms of both amplitude and aliasing errors and performance evaluation parameters of ECG subband processing application.