Wavelet transforms have been around for a while, and even used in JPEG 2000 for compression [1]. The article on Wikipedia does a great job of describing it. Hil

Wavelet transforms have been around for a while, and even used in JPEG 2000 for compression [1]. The article on Wikipedia does a great job of describing it. Hilbert transforms are involved. I learned of wavelet transforms when I was learning about fractals in the late 1990's. [1] https://en.wikipedia.org/wiki/Wavelet_transform https://en.wikipedia.org/wiki/Wavelet_transform