How to compute and plot a Spectrogram?

Hey I'm very new to MATLAB...like I've never used it for anything other than checking answers to my matrices homework. I'm trying to load data from two ".mat" files and use that data to compute and plot a spectrogram. Does anyone have any idea how I might be able to do that? Thank you!

I've computed the spectrogram using the command:

[y,f,t,p] = spectrogram(song_waveform, 128, 120, 256, 1E3, 'yaxis');

where "song_waveform" is the file containing the loaded data. Am I using this command right? The next step is to plot the computed spectrogram using the "IMAGESC" command. I've tried "Help IMAGESC" and didn't really get anything out of it. What do you think I should do now? Thank you for any help you can give.

Answer 1

[Azzi Abdelmalek]

Look at

help load
help plot

[adam]

Hey, so I'm still working on this. It's taking forever but I'm trying to persevere. I've calculated the spectrogram, but I'm not able to plot it. I was told to use the IMAGESC command, but there is not much help when doing help imagesc so I was wondering if you had any more advice?

[Azzi Abdelmalek]

For more details use

doc imagesc

%Or look at this link

http://www.mathworks.com/help/matlab/ref/imagesc.html#f25-762613

You can also search on the net with keyword: matlab imagesc

[adam]

Is there any benefit in using "IMAGESC" versus "surf" in plotting a spectrogram?

Answer 2

[Youssef Khmou]

try to use help, like abdelmalek answered, or use the function directly :

 >>spectrogram(randn(200,1));      %  white noise