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  1. #1
    Nokia Developer Champion
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    Implementing FFT

    hi how can i implement FFT analysis for a recorded audio file?.I have implemented the FFT algo given in wiki, but what to do next i have no idea.

  2. #2
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    Re: Implementing FFT

    Well and what did you have in mind to achieve with the implementation of FTT though? For a simple usage of FFT(generic not on Symbian), check this :-

    http://www.mts.net/~mathers/q1_fft.html
    Cheers,
    Mayank

  3. #3
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    Re: Implementing FFT

    Quote Originally Posted by vineet.jain View Post
    hi how can i implement FFT analysis for a recorded audio file?.I have implemented the FFT algo given in wiki, but what to do next i have no idea.
    What exactly do you want to achieve?

  4. #4
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    Re: Implementing FFT

    actually i want to implement FFT on an audio signal for the analysis of various sound variations in an audio file.For e.g if in a recorded audio file i have some silence and some voice, then i want to differentiate between the two by measuring its intensity graphically , i mean to measure the variations of different sounds in a particular audio file, so i was just wandering if FFT would be a better way to do it, but im not getting any idea on how to implement it in symbian.

  5. #5
    Nokia Developer Moderator
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    Re: Implementing FFT

    FFT and signal processing in general have nothing Symbian-specific in it. You either know what it is, or you should simply read and learn.
    Fourier transformation is particularly useful when you are interested in characteristic frequencies of a given audio sample. However for differentiating between "sound" and "silence" it would be simpler to rely on the energy content of the audio data. Calculate (root) mean-square over a sliding window, and specify some threshold via experimentation.

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