Design of Cascaded Adaptive Filter for ECG Denoising Applications

Two stage LMS adaptive filter is designed for the purpose of ECG noise cancellation. The output of first LMS filter is given as input for second LMS. Error signal of first LMS filter is given as desired signal for second LMS filter. Signal to noise ratio of single LMS filter is compared with cascaded LMS adaptive filter and it is analyzed that noise elimination is more in cascaded LMS adaptive filter. The SNR value for 8-tap LMS filter using cascaded technique is 21.52% higher than the normal 8-tap LMS filter structure. The SNR value for 16-tap LMS filter using cascaded technique is 24.84% higher than the normal 16-tap LMS filter structure.