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Action on close of spectrumAnalyzer() object/windows

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Dear community,
at the moment I am preparing for some real time processing on audio recordings. I want to end the inifinite recording loop, when the visualizing window is closed. How can I achieve this, i cannot even find the handle to the plotting window.
so far the loop closes when the window with tunable properties is closed and then the spectrumAnalyzer() window is closed.
Note: this is about a spectrumAnalyzer object, not dsp.spectrumAnalyzer()
Unfortunately i cannot have a look into the first, since it is p-code
deviceReader = audioDeviceReader('NumChannels',2);
% Create scope
specScope = spectrumAnalyzer('SampleRate',deviceReader.SampleRate, ...
'Method','Filter bank', ...
'PlotAsTwoSidedSpectrum',false, ...
'FrequencyScale','Log', ...
'AveragingMethod','Exponential', ...
'ShowLegend',true, ...
'ChannelNames',{'Input channel 1','Output channel 1'}, ...
'YLimits',[-102.67239232318423 -22.46657271946507]);
% just a audio plugin doing some processing
sut = audiopluginexample.SpeechPitchDetector;
% Open parameterTuner for interactive tuning during simulation
tuner = parameterTuner(sut);
% Stream processing loop
nOverruns = 0;
figs=findall(0,'type','figure'); % end loop if any until here opened window is closed
while all(ishandle(figs))
% Read from input, process, and write to output
[in,novr] = deviceReader();
nOverruns = nOverruns + novr; % Increment the overrun counter
in = in(:,1);
out = process(sut,in);
% Visualize input and output data in scope
%%%%%% This call opens the window with representation, but i cannot
%%%%%% find the handle of this window to include it in the whilw
%%%%%% statement
% Process parameterTuner callbacks
drawnow limitrate
% Clean up

Accepted Answer

Jonas on 13 Dec 2022
Edited: Jonas on 13 Dec 2022
alright, I now got it. we can close and open the scope Window using show(scope) and hide(scope) und we can check if the scope window is hidden (closed) with isVisible(scope)
edit: When using with while(), dont forget a call to drawnow limitrate

More Answers (1)

Jonas on 12 Dec 2022
my insight so far:
I have seen, that a new Process is created, and the Window Name has the title "Spectrum Analyzer". we could use that and check via cmd or powershell, if the process exist with the Window TItle I asked for
unfortunately, this causes performance issues, which made me introduce a timer, which makes it check every some seconds
checking via cmd, i Used
[~,b] = system('tasklist /fi "WINDOWTITLE eq Spectrum Analyzer"');
(credit to here)
i then check in the text for the MATLABWindow with
if ~contains(b,'MATLABWindow.exe')
using powershell over cmd, I used
system( 'powershell -command "get-process | where-object {$_.mainWindowTitle -like ''Spectrum Analyzer''}"' );
(credit to here and here)
i then check in the text for the MATLABWindow with
if ~contains(b,'MATLABWindow')
in summary: it works, but the performance (of the system call) is really poor and not acceptable




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