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In fact, S. M. Simpson, eventually devised an efficient 24-point Fourier transform, which was a precursor to the Cooley-Tukey fast Fourier transform in 1965. The FFT made all of Simpson's efficient autocorrelation and spectrum programs instantly obsolete, on which he had worked half a lifetime. -Proc. IEEE, Sept. 1982, p.900
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watch 'dmesg | tail -20'