How can I plot a non-normalized spectrogram in MATLAB?

Question

I want to plot a non-normalized spectrogram in MATLAB. my input signal is y with 16KHz sample rate and 8bit per second. How can I plot its spectrogram in its frequency, not in normalized frequency?

multiply the normalized frequency by the Nyquist frequency – Hoki Dec 06 '14 at 10:38 — Hoki, Dec 06 '14 at 10:38

score 1 · Accepted Answer · answered Dec 06 '14 at 10:49

1

Assuming you have a license for the MATLAB signal processing toolbox, you can use the function spectrogram. You find details on this function on the MATLAB help page. The syntax is

S = spectrogram(x,window,noverlap,nfft,fs);

where fs is the sampling frequency. If you want to plot a spectrogram of a signal x with default parameters and sampling frequency 16kHz, you can just omit the other parameters:

spectrogram(x,[],[],[],16e3);

answered Dec 06 '14 at 10:49

hbaderts

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Thank you hbaderts! I do that but don't know why the axis scaling is the half of anything I enter as FS? – user3305284 Dec 07 '14 at 10:43

How can I plot a non-normalized spectrogram in MATLAB?

1 Answers1