function or algorithm to analyse signal content

Hello,

I'm trying to classify an audio signal I have by the following table which is taken from page 15 in this article

I'm not sure how to do it using matlab. perhaps anyone could refer me to some useful functions? the code I've tried is this one which plots the signal content in time domain:

    % get input paths
    input = importdata('paths\input_p1.txt');
    % create audio object for the algorithm
    [signal, fs] = audioread(char(input(index)));
    
   
    f0 = figure;
    t = 0:1/fs:1-1/fs;
    signal = resample(signal,1,90)';
    plot(t, signal);
    title('Signal Content');

And I got something that looks like `Narrowband random signal` ad shown below

but I wasn't sure I've understood it correctly, so i'de appreciate if anyone could explain to me how exactly can I plot the signal content using matlab.

Thank you

Answer 1

[Xavier]

MATLAB has a built-in FFT function (documentation) which may be of use