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How many complex additions are required to be performed in linear filtering of a sequence using FFT algorithm?
  • a)
    (N/2)logN
  • b)
    2Nlog2N
  • c)
    (N/2)log2N
  • d)
    Nlog2N
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
How many complex additions are required to be performed in linear filt...
The number of additions to be performed in FFT are Nlog2N. But in linear filtering of a sequence, we calculate DFT which requires Nlog2N complex additions and IDFT requires Nlog2N complex additions. So, the total number of complex additions to be performed in linear filtering of a sequence using FFT algorithm is 2Nlog2N.
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