How can i set the plot values of a specgram.

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Peter Cristian
Peter Cristian 2022-5-24
评论： Hiro Yoshino 2022-5-24
I have a DTMF signal, that i realized a specgram of it. But i dont know how to set my own values to it, i want to put this code to this signal.
title("Spectograma semnalului DTMF")
xlabel("Timp[ms]");
ylabel("Frecventa[Hz]");
axis([0, 800, 0, 2000]);
xticks(0:200:800);
yticks([800, 900, 1000, 1100]);
grid on;

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回答（1 个）

Hiro Yoshino
Hiro Yoshino 2022-5-24
Short Time Fourier Transform?
stft(x,fs,'Window',kaiser(256,5),'OverlapLength',220,'FFTLength',512);
see: https://jp.mathworks.com/help/signal/ref/stft.html
  3 个评论
显示 1更早的评论
Hiro Yoshino
Hiro Yoshino 2022-5-24
It seems that it is just about your setting for that function.
You can remove the "overlap" and try making the window narrower.
Hiro Yoshino
Hiro Yoshino 2022-5-24
If you want to suppress areas of no-interest, you can replace those values with something else by giving a threshold to it:
x(x<threshold) = 0;

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