Java Speech Processing

[redvirus]

I want to retrieve all the speech attributes of input voice. I want to digitalizes it so that I can manipulate attributes to produce different voices(Human).

I am so far able to retrieve a frequency spectrum of a input signal but i am not sure what to do next. Can any body help me.

I've taken following steps -

1. Input speech signal.
2. FFT of data to generate frequency spectrum.

I'm not getting how to proceed now.