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Issue No.08 - August (1979 vol.28)
pp: 577-580
A.R. Butz , Department of Electrical Engineering, Northwestern University
When the FFT is employed for nonrecursive digital filtering, the time required to process one block of input data, N samples long, is often approximately of the form N(logr (N) + Q), where Q = 0. Earlier results on determining optimum N have assued Q =0, becauese it has long been informally observed that typically little is to be gained by taking the value of Q > 0 into account, and because the assumption that Q = 0 permits determination of N without reference to machine dependent parameters
nonrecursive filtering, Convolution, correlation, FFT
A.R. Butz, "FFT Length in Digital Filtering", IEEE Transactions on Computers, vol.28, no. 8, pp. 577-580, August 1979, doi:10.1109/TC.1979.1675414
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