Add 50Hz noise to this ecg signal and then design notch filter to remove it. (MATLAB) x=0.01:0.01:2; default=input('Press 1 if u want default ecg signal else press 2:\n'); if(default==1) li=30/72; a_pwav=0.25; d_pwav=0.09; t_pwav=0.16; a_qwav=0.025; d_qwav=0.066; t_qwav=0.166; a_qrswav=1.6; d_qrswav=0.11; a_swav=0.25; d_swav=0.066; t_swav=0.09; a_twav=0.35; d_twav=0.142; t_twav=0.2; a_uwav=0.035; d_uwav=0.0476; t_uwav=0.433; else rate=input('\n\nenter the heart beat rate :'); li=30/rate; %p wave specifications fprintf('\n\np wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_pwav=0.25; d_pwav=0.09; t_pwav=0.16; else a_pwav=input('amplitude = '); d_pwav=input('duration = '); t_pwav=input('p-r interval = '); d=0; end %q wave specifications fprintf('\n\nq wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_qwav=0.025; d_qwav=0.066; t_qwav=0.166; else a_qwav=input('amplitude = '); d_qwav=input('duration = '); t_qwav=0.166; d=0; end %qrs wave specifications fprintf('\n\nqrs wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_qrswav=1.6; d_qrswav=0.11; else a_qrswav=input('amplitude = '); d_qrswav=input('duration = '); d=0; end %s wave specifications fprintf('\n\ns wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_swav=0.25; d_swav=0.066; t_swav=0.09; else a_swav=input('amplitude = '); d_swav=input('duration = '); t_swav=0.09; d=0; end %t wave specifications fprintf('\n\nt wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_twav=0.35; d_twav=0.142; t_twav=0.2; else a_twav=input('amplitude = '); d_twav=input('duration = '); t_twav=input('s-t interval = '); d=0; end %u wave specifications fprintf('\n\nu wave specifications\n'); d=input('Enter 1 for default specification else press 2: \n'); if(d==1) a_uwav=0.035; d_uwav=0.0476; t_uwav=0.433; else a_uwav=input('amplitude = '); d_uwav=input('duration = '); t_uwav=0.433; d=0; end end pwav=p_wav(x,a_pwav,d_pwav,t_pwav,li); %qwav output qwav=q_wav(x,a_qwav,d_qwav,t_qwav,li); %qrswav output qrswav=qrs_wav(x,a_qrswav,d_qrswav,li); %swav output swav=s_wav(x,a_swav,d_swav,t_swav,li); %twav output twav=t_wav(x,a_twav,d_twav,t_twav,li); %uwav output uwav=u_wav(x,a_uwav,d_uwav,t_uwav,li); %ecg output ecg=pwav+qrswav+twav+swav+qwav+uwav; figure(1) plot(x,ecg);