Method of performing real input fast fourier transforms simultaneously on two data streams
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United States of America Patent
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Sep 16, 1986
Grant Date -
N/A
app pub date -
Dec 27, 1983
filing date -
Dec 27, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Simultaneous FFT's are calculated for two real input sequences utilizing a two channel recursive FFT structure. The method of operating such a structure disclosed includes the log.sub.2 N stages (for an N-point transform) known in the prior art plus a final unscrambling stage. A method of arranging the outputs of the log.sub.2 N-th stage for use as inputs to the unscrambling stage is disclosed which results in substantially unscrambled FFT outputs for the two sequences without the need for extra unscrambling hardware.
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