Undefined variable "dsp" or class

%% Applying the adaptive filter
% The adaptive noise canceller can use almost any adaptive procedure to perform its task. 
% For simplicity, we shall use the least-mean-square (LMS) adaptive filter with 15 
% coefficients and a step size of 0.00007. With these settings, the adaptive noise canceller 
% converges reasonably well after a few seconds of adaptation--certainly a reasonable 
% period to wait given this particular diagnostic application.
 
h = dsp.LMSfilter(15, 0.001);
[y,e] = filter(h,x,d);
 
% [y,e] = FECG_detector(x,d);
 
subplot(3,3,5); plot(t,d,'c',t,e,'r');
%axis([0 7.0 -4 4]);
grid;
xlabel('Time [sec]');
ylabel('Voltage [mV]');
title('Convergence of Adaptive Noise Canceller');
legend('Measured Signal','Error Signal');

getting this error:

Undefined variable "dsp" or class

"dsp.LMSfilter".

Can anyone fix this?

Answer 1

[Walter Roberson]

You need to license and install DSP System Toolbox; https://www.mathworks.com/products/dsp-system.html