11.11 COMPUTATIONAL COMPLEXITY COMPARED TO DIRECT COMPUTATION
Radix-2 DIT FFT algorithm reduces number of computations which are involved in the butterfly operation shown in Fig. 11.14.
Fig. 11.14 Computations in one butterfly in which ‘subtraction’ operation avoids multiplication by ‘–1’
In the Fig 11.14, b is multiplied by 
resulting in one complex multiplication. 
and which are obtained by complex addition and subtraction. Therefore, it ...
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