What is the solution for below code? It shows error

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);

Answer 1

[Star Strider]

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.

[Yasir Ali]

star strider May I have your email Id plz as I can contact with you .

[Star Strider]

I do not use email for MATLAB Answers threads. I prefer to keep everything here.

[Yasir Ali]

actually , Iam worried Iam new to matlab I have to extract audio frequency in different parts for example I have a 5 seconds wav file I want to read there Some micro seconds and their frequency spectrum like 0.030 ms , I need code for it in which I can easily get frequency response in different parts ,your help will highly appreciated .

[Image Analyst]

Nothing that can't be worked on here instead of in private emails.

[Yasir Ali]

image analyst its ok , help me here to get solution of my problem

[Star Strider]

@Image Analyst — Thank you. My sentiments exactly.

@Yasir Ali — Private email disrupts the flow of the conversations here. For many reasons, that is not desirable.

[Yasir Ali]

you seniors are absolutely right .

@Star Strider I explain my Querry can you help me to solve it ?

[Star Strider]

@Yasir Ali — I have done my best with the information you provided. If you have more information to share, I will do my best to help you solve your problem.

[Yasir Ali]

Star Strider I have wav file of five seconds , I want to read wav file freqeuncy spectrum in Micro seconds/miliseconds e.g from five seconds I want frequency response of 0.030 ms , or in different parts .

[Star Strider]

Please read the spectrogram documentation and adjust your variables to what it requires.

[Yasir Ali]

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 .

[Star Strider]

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.