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What is the meaning of a complex frequency, specifically as an output of an FFT?

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What is the meaning of a complex frequency, specifically as an output of an FFT?

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  1. The frequencies of the bins of the output of a basic (2D) FFT are real, not complex. However their values may be (and usually are) complex.

    The ratio of the real part to the complex part determines the phase of the sinusoid at that frequency.

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