how to display spectrogram of a audio in App Designer
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![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/196911/image.png)
I want show the figure in the app designer interface.But did not success.I only can plot it outside of app designer.I am using Matlab 2018b.
spectrogram(audio,window,noverlap,nfft,fs,'yaxis');
Anyone know how to do it. Thanks.
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Edgar Guevara
2018-10-3
Dear Austin,
You need to specify which axes will be used for plotting, inside a callback for plotting such spectrogram, you may use the following example code:
t = 0:0.001:2;
x = chirp(t,100,1,200,'quadratic');
myAxe = app.UIAxes;
[S,F,T] = spectrogram(x,128,120,128,1e3);
imagesc(myAxe, T, F, log(1+abs(S)) ); %plot the log spectrum
set(myAxe,'YDir', 'normal'); % flip the Y Axis so lower frequencies are at the bottom
Let me know if that solves your problem.
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Edgar Guevara
2018-10-4
I think your spectrogram is not displayed on log scale, try the following code, which reproduces the output from the built-in function:
methods (Access = private)
% Button pushed function: Button
function plotSpec(app, event)
t = 0:0.001:2;
x = chirp(t,100,1,200,'quadratic');
myAxe = app.UIAxes;
[S,F,T] = spectrogram(x,128,120,128,1e3);
imagesc(myAxe, F, T, log(abs(S'))); %plot the log spectrum
set(myAxe,'YDir', 'normal'); % flip the Y Axis so lower frequencies are at the bottom
axis square
axis tight
colorbar
end
end
As you can see:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/192690/image.jpeg)
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