User`s guide
IFFT
5-237
Example For an example of how to optimize computations when using both the IFFT 
block and FFT block in the same model, see the FFT block reference page 
example, “Use of Outputs in Bit-Reversed Order” on page 5-179.
Dialog Box
Twiddle factor computation
Computation method of the term  in Equation 5-3. In 
Table lookup mode, the block computes and stores the sine and cosine 
Input Complexity Other Parameter 
Settings
Algorithms Used for FFT Computation
Complex not applicable Radix-2 DIT
Real Radix-2 DIT
Real Radix-2 DIT in conjunction with the half-length 
and double-signal algorithms when possible
e
j2π m 1–()k 1–()M⁄










