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Eric P Postpischil, 6216 Woodhaven Cir, Merrimack, NH 03054

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16 Woodhaven Cir, Merrimack, NH 03054   

330 Mathilda Ave, Sunnyvale, CA 94085   

1100 Lake Shadow Cir, Maitland, FL 32751   

6 Hamlett Dr, Nashua, NH 03062    603-8885484    603-8885485   

6 Hamlett Dr #17, Nashua, NH 03062    603-8885484   

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Us Patents

Hybrid Fast Fourier Transform

US Patent:
2012013, May 24, 2012
Filed:
Nov 22, 2010
Appl. No.:
12/952071
Inventors:
Eric David Postpischil - Merrimack NH, US
Assignee:
APPLE INC. - Cupertino CA
International Classification:
G06F 17/14
US Classification:
708404
Abstract:
A hybrid fast Fourier transform (FFT) combines a prime-factor algorithm (PFA) with a Cooley-Tukey algorithm (CTA). The combining includes performing combined permutations and combined weight multiplications during CTA processing using permutations and weights derived from the PFA processing and the CTA processing to improve efficiency. The combined permutations can include the last permutation of the PFA processing combined with the first permutation of the CTA processing. The combined weights can include multiplying weights resulting from a permutation that was omitted during PFA processing by “twiddle” factors generated during CTA processing. The combined weights can be pre-computed and stored in table where they can be applied during CTA processing.

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