i want to analyze fft of siganl which is coming in in parts (25 to 101 bytes).

[jai ho]

i am getting siganls from serial port . but siganl is coming in variable form . it is varying from 25 to 101 bytes . so accordingaly fft  is varying .

i want clear fft .. can i store data ,, or shuld i do anything else ..

 ..

ankur k