RE: Quick Question About Signal Processing

[Mat Spandl]

Hi Ahmed,

 

One possibility would be if y wasn’t a vector, for example if it was an array. If it’s got two rows (or columns) of data then look at them individually.

 

Hope this helps.

 

Mat.

 

 

From: Help-octave [mailto:help-octave-bounces+address@hidden On Behalf Of Ahmed Husain ?Abbas Mohamed Sahrab
Sent: 11 November 2016 13:55
To: address@hidden
Subject: Quick Question About Signal Processing

 

Dear Esteemed Volunteers.

 

I have a question about incorporating a piece of code into my project.

I have found this piece of code online

 

   Fs = 1000;

    t = 0:1/Fs:1-1/Fs;

    x = cos(2*pi*100*t)+randn(size(t));

    [Pxx,F] = periodogram(x,[],length(x),Fs);

    plot(F,10*log10(Pxx))

 

and I would like to use the wavread command and use that signal in place of the Fs,t and x. So, I wrote this bit of code

 

[y, fs]= wavread('song1.wav');

NFFT=input("Choose a fraze size of either 128, 256 and 512. ");

[Pxx,F] = periodogram(y,[],NFFT,fs);

plot(F,10*log10(Pxx))

 

But I am sad to report this it is not working, and that I am receiving this error

 

⹏፥error: periodogram: X must be a real or complex vector

 

If you can help me I would appreciate it immensely 

With Love,

Ahmed Suhrab