Error in dsp.LMSFilter

Error in

matlab.system.SystemProp/setProperties

Error in dsp.LMSFilter

Error in adaptivefilters

(line 8)

h = dsp.LMSFilter(15,

0.0007);

[Rehman Tanim]

This is the code:

%% 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, 0.0007);

[y,e] = filter(h,x,d);

% [y,e] = FECG_detector(x,d);

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');

Answer 1

[Soumya]

Hi @Rehman,

The error you are encountering is due to the way the ‘dsp.LMSFilter’ object is being created in the code. According to the MATLAB’s official documentation, the correct way to create a ‘dsp.LMSFilter’ object is by specifying the properties using name-value pairs. The syntax ‘dsp.LMSFilter(Name,Value)’ returns an LMS filter object with each specified property set to the specified value.

You can find the correct syntax below:

h = dsp.LMSFilter('Length', 15, 'StepSize', 0.0007); 

Please refer to the following documentation for more information:

https://www.mathworks.com/help/dsp/ref/dsp.lmsfilter-system-object.html

I hope this helps!