Method for performing complex fast fourier transforms (FFT's)
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United States of America Patent
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Nov 10, 1998
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N/A
app pub date -
Dec 28, 1995
filing date -
Dec 28, 1995
priority date (Note) -
Expired
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Abstract
A method in a computer system of performing a butterfly stage of a complex fast fourier transform of two input signals. First, a packed multiply add is performed on a first packed complex value generated from a first input signal and a set of trigonometric values to generate a first product. Then, a second product is generated which comprises the first product with a sign inverted. A packed add of the second product and a second complex value generated from a second input signal is performed to generate a first result, and the first product and the second complex value to generate a second result.
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