How to get the frequency of the sound to draw spectrum in JavaME?

I have a problem and I 开发者_Python百科need your help. I want to read a media file (mp3, wav,...), play it, and draw its spectrum but I don't know how to get the frequency of the sound in J2ME. Anybody can give me an answer ? Thanks!

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What you are looking for is called "Fast Fourier Transform" or FFT for short. It is a method of analyzing a sound to extract spectrum information. See http://www.developer.nokia.com/Community/Discussion/showthread.php?165183-Frequency-Analysis-in-J2ME for links to some sources.

You can also Google for j2me fft