Wave file modification

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Hi Sujoy I hail from Pakistan. I was searching on wav file processing and saw ur article on wav file processing. Thats eally wonderful and close to problem. I actually want to know how to get the frequency and amplitude of loaded file and to modify these values and play that modified file in stead of original file.

Posted 25-Mar-11 7:53am

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-03-25T08:04:00

There is not frequency and amplitude in the WAV data, there is a spectrum. Sometimes you can figure main frequencies, sometimes you cannot. Even if the sound is one pure tone, strictly speaking, its spectrum is a bit wider than one frequency point, because one fixed frequency signal (delta-function spectrum) is only a case of infinitely long signal. This is a matter of spectrum analysis.

Read this:
http://en.wikipedia.org/wiki/Frequency_spectrum[^]
http://en.wikipedia.org/wiki/Sound_spectrum[^]
http://en.wikipedia.org/wiki/Fourier_transform[^]
http://en.wikipedia.org/wiki/Fast_Fourier_transform[^]

AForge.NET library has Fourier transform methods, see http://code.google.com/p/aforge/[^].
I also found this: http://www.sdss.jhu.edu/~tamas/bytes/fftwcsharp.html[^].

—SA