How can I force the time-axis unit of spectrogram to be 'second(s)' ?
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When I use the spectrogram function (https://www.mathworks.com/help/signal/ref/spectrogram.html) , I find that depends on the time duration of the y data, the time-axis units are dynamic, shifting between 'second(s)' and 'milisecond(s)'. So is it possible to force the unit to be 'second(s)'?
2 commentaires
Adam Danz
le 25 Mai 2021
Are you referring to your inputs or are you referring to something in the plot produced by spectrogram?
It would be helpful to provide a screen shot of the figure or supply the input data, depending on what you're describing.
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Adam Danz
le 26 Mai 2021
Modifié(e) : Adam Danz
le 27 Mai 2021
I don't know whether there's an input to spectrogram that could solve this but here's how to fix the labels after the plots are created.
You could detect whether the x-axis is in seconds or ms by the xlabel;
if strcmpi(ax1.XLabel.String, 'Time (ms)')
ax1.XTickLabels = compose('%.1f',ax1.XTick/1000); % set tick labels
xlabel(ax1, 'Time (s)') % set axis label
end
P1=[10,-1];
fs = 32000;
y1 = wgn(1*fs,1,1);
y2 = wgn(2*fs,1,1);
figure;
ax1 = subplot(2,1,1); % get handle
spectrogram(y1,hamming(512),512-round(fs/1e3),512,fs,'yaxis');
subplot(2,1,2)
spectrogram(y2,hamming(512),512-round(fs/1e3),512,fs,'yaxis');
ax1.XTickLabels = compose('%.1f',ax1.XTick/1000); % set tick labels
xlabel(ax1, 'Time (s)') % set axis label
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