microphone plot response documentation results different from execution results

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Seetha Rama Raju Sanapala 2015-5-21

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https://ww2.mathworks.cn/matlabcentral/answers/217900-microphone-plot-response-documentation-results-different-from-execution-results

关闭： MATLAB Answer Bot 2021-8-20

I have taken an example program from MATLAB documentation as below (phased array)

freq = [500 1000];
hmic = phased.CustomMicrophoneElement(...
    'PolarPatternFrequencies',freq);
hmic
hmic.PolarPattern= mag2db([...
    0.5+0.5*cosd(hmic.PolarPatternAngles);...
    0.6+0.4*cosd(hmic.PolarPatternAngles)]);
plotResponse(hmic,freq,'Format','Polar');
ha = phased.ULA('NumElements',4,'ElementSpacing',0.5,...
    'Element',hmic);
figure;
plotResponse(ha,freq,340,'Format','Polar')
ha = phased.ULA('NumElements',4,'ElementSpacing',0.5,...
    'Element',hmic);
figure;
plotResponse(ha,freq,340,'Format','Polar')

When I run the results are different in the sense that the polar angle measurement is in reverse order. In the documentation plots, the angle measurement is positive for clockwise where as I get positive for anticlockwise. Why is this?

Is the documentation to be updated?

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Answer 1

Honglei Chen 2015-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/217900-microphone-plot-response-documentation-results-different-from-execution-results#answer_180679

The documentation is not up to date. Thanks for catching that. The plot is now counter clockwise so the positive angles are above 0 degrees and negative angles are below 0 degrees. This seems to match people's expectation better.