How to change the resolution of a spectrogram?

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Sultan Al-Hammadi
Sultan Al-Hammadi 2018-10-24
评论： Sultan Al-Hammadi 2018-10-26
I have written a code which used to plot the spectrogram of a signal. This line was to get the spectrogram:
[s,f2,t] = spectrogram(xc,win,noverlap,FFT_LENGTH,fs,'yaxis');
Then I used imagesc to plot the spectrogram: imagesc(t,f2,20*log10(abs(s)));
Everything is working fine except the following thing:
I don't know how to change the scale/resolution for the thing circled by a red line [looks like steps] to make it looks like a straight line (not like steps)? (please see the attached spectrogram)

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