I have generated an EEG signal in MATLAB.Then in have added random noise to it,n then filtered it using the code as under.But i am getting an error.Can anyone help me to remove it ?
fs = 512 T = 1/fs; N =length(EEGsig); ls = size(EEGsig); tx =[0:length(EEGsig)-1]/fs; fx = fs*(0:N/2-1)/N; x= EEGsig; sd = 0.1; normal_noise = sd*randn(1, N); noisy_EEGsig = x + normal_noise; figure(); subplot(4,1,1); grid on; plot(tx, x); xlabel('Time [s]'); ylabel('Amplitude'); title('Original signal'); subplot(4,1,2); grid on; plot(tx,normal_noise); xlabel('Time [s]'); ylabel('Amplitude'); title('Noise'); subplot(4,1,3); grid on; plot(tx, noisy_EEGsig); xlabel('Time [s]'); ylabel('Amplitude'); title('Original signal + Noise'); subplot(4,1,4); d = designfilt('bandstopiir', 'FilterOrder', 2, 'HalfPowerFrequency1', 59, 'HalfPowerFrequency2', 61, 'DesignMethod', 'butter', 'SampleRate', fs); fvtool(d,'fs',fs) buttLoop = filtfilt(d, noisy_EEGsig); plot(t, noisy_EEGsig,t,buttLoop) ylabel('Voltage (V)') xlabel('Time (s)') title('filtered signal') legend('Unfiltered','Filtered') grid
The error i am getting is :
"Undefined function 'designfilt' for input arguments of type 'char'."
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