Error in dsp.LMSFilter

2020 11 23
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更新时间：2025 8 13
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Error in
matlab.system.SystemProp/setProperties
Error in dsp.LMSFilter
Error in adaptivefilters
(line 8)
h = dsp.LMSFilter(15,
0.0007);

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Rehman Tanim
Rehman Tanim 2020-11-23
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');

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回答（1 个）

Soumya
Soumya 2025-8-13

0 个投票

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!

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Soumya
Soumya
2025-8-13

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