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frequency extraction from fft components

hii i am giving a real time voice signal TO C5535 DSP CHIP and calculating its fft.

can someone pls tell me hw to extract the frequency components using these fft co efficients, or atleast direct me to where i can find the information on this.

thanks and regards

vatsa

  • Since your data is already bitreversed your output is in order. This means your first value in the result array is your static co efficient. The rest can be mapped to a distinct frequency by this formula:

    F=sample_Frequency*n/fft_size

    Sample Frequency depends on your sensor for example 16.000 Hz
    fft_size is your data size. e.g 512 or 1024
    n is your index 0 to sample/fft size

    The easiest way is to put your result data in one column in excel and calculate the corresponding frequency next to it with this formula.