MadCow

Hello,

I am wanting to know how to make a graph which shows the volumes of frequencies of a sound (like the bar visualization in Windows Media Player). I have no idea where to start, so I need help. (I know DirectX and c++ quite well if they will help me). The difficultly I am having is I don't know how to determine the frequencies of a sound, making the graph is easy once I know that.

Thank you.

Klarre

You should check out fmod (http://www.fmod.org/). I am not really sure, but I think you can get frequences out of your sound using this library. Worth a check anyway. Great lib!

DaWei

You may be seeing just instantaneous peak representations versus time in WMP, not the same thing as magnitude of the various frequencies present. I'm not familiar with the library Klarre referenced, but if it has FFT capabilities, it'd definitely do the job.

EDIT: Hey, Klarre, I tried to follow that link and got a 404.

EDIT II: Never mind, it was the close parenthesis, lol, got there.

EDIT III: Great link, Klarre, thanks, and it does offer spectrum analysis.

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MadCow

Thanks alot, this looks great.
Hmm...good point

DaWei

Here's an FFT analysis of a C&W song. Not nearly as sexy as a lissajous pattern or an envelope amplitude varying over time. Much more useful, though. Quite a lot of the high-end clarity of the guitars got lost in the rolloff. The program that produced this is a tool, not something I've looked at hooking into.

Attached Images

FFTanalysis.jpg (17.0 KB, 28 views)

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers