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Pruning the decimation-in-time FFT algorithm with frequency shift

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1 Author(s)
Nagai, K. ; University of Tsukuba, Ibaraki, Japan

Fourier transformed components within desired narrow-band can be efficiently calculated by the pruned version of the decimation-in-time FFT algorithm. A new pruning method is proposed here which invloves frequency shift. The shifting simplifies the pruning algorithm because its flowgraph has a repetitive pattern of butterflies between adjacent stages.

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Acoustics, Speech and Signal Processing, IEEE Transactions on  (Volume:34 ,  Issue: 4 )