how to fix the following error?

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Yasir Ali
Yasir Ali 2019-3-26
评论： Jan 2019-4-4
dear Seniors and Experts I need solution for following code kindly help me to fix it .
data is
y=195840*2 double
fs=48000
t=0:0.001:2; % 2 secs @ 1kHz sample rate
x=chirp(t,0,1,150); % Start @ DC, cross 150Hz at t=1sec
F = 0:.1:100;
[y,f,t,p] = spectrogram(x,256,250,F,1E3,'yaxis');
% NOTE: 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('Frequency (Hz)');
[y,fs]=audioread('Mithe Mustafa Tey 5sec.mp3');
NW = round(fs*0.250);
[S,F,T,P] = spectrogram(y,NW,[],[],fs);
Error using spectrogram>chkinput (line 252)
X must be a vector (either row or column).
Error in spectrogram (line 166)
chkinput(x);
while I click on line 252 and 166 it shows this
line 252 = error(message('signal:spectrogram:MustBeVector', 'X'));
line 166 = chkinput(x);

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采纳的回答

Yasir Ali
Yasir Ali 2019-3-26
Thanks Dear walter If I wish to plot both channels then how to do that?
  2 个评论
Walter Roberson
Walter Roberson 2019-3-26
subplot(1,2,1)
spectrogram(y(:,1), NW, [], [], fs);
title('left channel')
subplot(1,2,2)
spectrogram(y(:,2), NW, [], [], fs);
title('right channel')
Jan
Jan 2019-4-4
@Yasir: This is not an answer, which solves the question. Marking it as "accepted" means, that your problem is solved by this answer. Please post comments in the section for comments.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2019-3-26
Your mp3 is stereo, 2 channels. spectrogram() can only process one channel at a time.
You need to do one of the following:
  1. Choose one of the two channels and only process that one; or
  2. combine the two channels into one, such as by using mean(); or
  3. call spectrogram twice, once for each of the channels.
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Yasir Ali
Yasir Ali 2019-3-26
编辑：Walter Roberson 2019-3-30
Dear walter one last guideline require I found your comments very helpful
In above code I have try to get frequency response of audio in milisecond is it good code for getting frequency in miliseconds? ?
And when I try to get spectrum above 300 like 350 ms or more than error comes index dimension exceeds.
Walter Roberson
Walter Roberson 2019-3-30
I am not sure. My calculation at the moment is that with your window of 256 that you would get resolution to about 375 Hz, but I do not trust those calculations at all.

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