I see that the DSP library has two functions for forward FFT of real input,
namely rfft_fr16 and rfftrad4_fr16. Those two take fract16 input and give
complex_fract16 output. I do not see any functions for doing the inverse
FFT, which should take complex_fract16 input and produce fract16 output. Is
there any way of doing the inverse FFT of real input using the DSP library?
Reply by Vic●August 4, 20032003-08-04
I can't answer to you directly. But I remember for real FFT is 2 ways:
1) all Im =0,
2) 0,2,4... as Rl, 1,3,... as Im.
See as it did in your FFT functions.