aditya aditya - 5 months ago 67
Android Question

How to generate the spectrogram of a wav file in Matlab with frequency on the x-axis

As part of a research project, I would like to analyze a sound file by generating it's spectrogram.

I have been able to successfully generate the spectrogram of the wave file in matlab with frequency on the y-axis and the time on the x-axis. I would however, like to generate the spectrogram with the frequency on the x-axis and the time on the y-axis. How can this be done?

I have searched through stack and have not found any accepted answers.

My code which generates the spectrogram with the frequency on the y-axis and the time on the x-axis (Matlab code):

[song, fs] = wavread('filename.wav');
windowSize = 256;
windowOverlap = [];
freqRange = 0:300;
spectrogram(song, windowSize, windowOverlap, freqRange, fs, 'yaxis');

I changed the parameter 'yaxis' in the function spectrogram to 'xaxis' and the frequency is now on the x-axis with time on the y-axis. But, I get a spectrogram different from what is generated from a reliable source.

Here is the spectrogram that I generate - spectrogram

The spectrogram generated from a reliable source (I don't have the code).


Moreover, the color scheme is different in both the spectrograms. And my recording is 50 seconds long whereas the time displayed on the label is 9 seconds. How can I resolve these issues?

My end task is to be able to generate the spectrogram on an android device (probably using the GraphView library in android). So I would have to write code to generate the spectrogram in Java.

Any help on this is greatly appreciated.



Sorry, I don’t have whichever