In an earlier article on the Fourier transform, lcamtuf’s blog talked about the frequency domain — a wondrous mathematical place where complex signals are transmuted into the amplitudes and phases of sine waveforms. The frequency domain allows us to perform all kinds of signal processing tricks that seem nearly impossible to pull off when we stare at the data in its most straightforward form — that is, in the time domain.
At the end of that deep dive, there was one question unanswered: how real is this frequency place, anyway?
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