November 2010
Intermediate to advanced
288 pages
8h 34m
English
book
Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
by C. Britton Rorabaugh
Content preview from Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
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Note 17. FFT: Decimation-in-Time Algorithms
Consider the discrete Fourier transform for an N-point sequence
17.1
where
For even N, the DFT summation can be split into two separate summations—one for the even-indexed samples of x[n] and one for the odd-indexed samples.
17.2
Each of the summations in the final line of Eq. (17.2) is in the form of an (N/2)-point DFT. The signal flow graph (SFG) corresponding to the final line of Eq. (17.2) is shown ...
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