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What Is the Fourier Transform?

(www.quantamagazine.org)
474 points rbanffy | 1 comments | 04 Sep 25 22:11 UTC | HN request time: 0s | source
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yshklarov ◴[05 Sep 25 00:15 UTC] No.45133701[source]▶
As everyone in this thread is sharing links, I'm gonna pitch in, too.

This lecture by Dennis Freeman from MIT 6.003 "Signals and Systems" gives an intuitive explanation of the connections between the four popular Fourier transforms (the Fourier transform, the discrete Fourier transform, the Fourier series, and the discrete-time Fourier transform):

https://ocw.mit.edu/courses/6-003-signals-and-systems-fall-2...

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RachelF ◴[05 Sep 25 05:47 UTC] No.45135339[source]▶
I wonder what happened to Wavelet transforms? The were very popular years ago, and now one never hears about them.
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1. acjohnson55 ◴[05 Sep 25 12:22 UTC] No.45137690[source]▶
They have specialized applications for sure. I think it's just not as hot an area for new applied math work as 20 years ago.