13 lines
643 B
Text
13 lines
643 B
Text
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;Task:
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Calculate the FFT (<u>F</u>ast <u>F</u>ourier <u>T</u>ransform) of an input sequence.
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The most general case allows for complex numbers at the input
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and results in a sequence of equal length, again of complex numbers.
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If you need to restrict yourself to real numbers, the output should
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be the magnitude (i.e.: sqrt(re<sup>2</sup> + im<sup>2</sup>)) of the complex result.
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The classic version is the recursive Cooley–Tukey FFT. [http://en.wikipedia.org/wiki/Cooley–Tukey_FFT_algorithm Wikipedia] has pseudo-code for that.
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Further optimizations are possible but not required.
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<br><br>
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