What is the solution for below code? It shows error

1 view (last 30 days)
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
[y,f,t,p] = spectrogram (x,256,250,F,1E3,'yaxis');
% this is the same as calling spectrogram with no outputs
axis xy; axis tight; colormap(jet);view(0,90);
xlabel ('time');
ylabel('Frequench (HZ)');
[y,fs] =audioread('filename.wav');
[,F,T,P]= spectrogram(y,NW,[],[],fs);
Error using Spectrogram>chkinput (
Xmust be a vector(either row or column)
Error in spectrogram (line166) chkinput (x);

Answers (1)

Star Strider
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.
Star Strider
Star Strider on 19 Feb 2019
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.

Sign in to comment.


Find more on Time-Frequency Analysis in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!