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The Length
inverse DFT is given by [264]
![$\displaystyle x(n) = \frac{1}{N}\sum_{k=0}^{N-1} X(k) e^{j2\pi nk/N}, \quad n=0,1,2,\ldots,N-1.$](img1598.png) |
(10.16) |
This suggests that the DFT Filter Bank can be inverted by simply
remodulating the baseband filter-bank signals
,
summing over
, and dividing by
for proper
normalization. That is, we are led to conjecture that
![$\displaystyle x(n-N+1) = \frac{1}{N}\sum_{k=0}^{N-1} y_k(n) e^{j2\pi nk/N}, \quad n=0,1,2,\ldots\,.$](img1599.png) |
(10.17) |
This is in fact true, as we will later see. (It is straightforward
to show as an exercise.)
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