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What is the solution for below code? It shows error

Asked by Yasir Ali on 18 Feb 2019
Latest activity Commented on by Star Strider
on 19 Feb 2019
t=0:0.001:2; %sec @ 1 khz sample rate
x=chirp(t,0,1,150); %start @ DC ,cross 150 HZ at t=1 sec
F=0:.1:100;
[y,f,t,p] = spectrogram (x,256,250,F,1E3,'yaxis');
% this is the same as calling spectrogram with no outputs
surf(t,f,10*log10(abs(p)),'edgeColor','none');
axis xy; axis tight; colormap(jet);view(0,90);
xlabel ('time');
ylabel('Frequench (HZ)');
[y,fs] =audioread('filename.wav');
NW=round(fs*0.025);
[,F,T,P]= spectrogram(y,NW,[],[],fs);
Error using Spectrogram>chkinput (
line252)
Xmust be a vector(either row or column)
Error in spectrogram (line166) chkinput (x);

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1 Answer

Answer by Star Strider
on 18 Feb 2019

I suspect the error refers to this assignment:
[,F,T,P]= spectrogram(y,NW,[],[],fs);
(that also seems to be missing an output, so it will throw an error). I assume that you intend:
[Y,F,T,P]= spectrogram(y,NW,[],[],fs);
Note that the second assignment to ‘y’ is the result of:
[y,fs] =audioread('filename.wav');
and if ‘y’ is a stereo signal, it will have 2 columns, so check that with the size function. The most likely correction is to choose one of them for each spectrogram call.

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Please read the spectrogram documentation and adjust your variables to what it requires.
I gone through it but Iam not understanding how to adjust according my choice I have try my level best but I unable to find a good result as I am not much familiar with matlab programming thats why Iam asking to help for coding .
The documentation describes all of this much better than I can. You will likely have to experiment with your code until it does what you want it to.
That is how I learned programming, and likely how the rest of us here learned.

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