Java - Finding frequency and amplitude of audio signal using FFT -

after reading no. of posts here have applied fft algorithm on recorded audio(.wav) file transform time domain frequency domain.

as result have got array containing values as

magnitude[i] = sqrt(re*re+im*im); 

now title says have find frequency , amplitude of signal(complex sound i.e voice) using magnitude array, have no idea of how further processing using array.the size of fft 1024 , sample rate 48000hz. please me further processing.

if you're looking single largest (sinusoidal) component scan through magnitude array until find maximum value, , convert index of value corresponding frequency, i.e.

mag_max = magnitude[0]; i_max = 0; (i = 1; < n; ++i) {     if (magnitude[i] > mag_max)     {         mag_max = magnitude[i];         i_max = i;     } } 

you have value of peak in mag_max , index in i_max. can frequency this:

f_max = i_max * fs / n; 

where fs sample rate (and n fft size of course).

of course if you're looking pitch of complex sound (e.g. voice or musical instrument) things lot more complicated. might want take @ harmonic product spectrum algorithm , pitch detection algorithms in general.