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Negative frequency
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Dave3:
Last week, I fell into the rabbit hole of "negative frequency". Is it just a quirk of the maths or a real-world phenomenon?

I wanted to recommend Mark Newman's enjoyable and brief "negative frequency" introduction video. Mark brings together some complex ideas into layman's terms that even a beginning hobbyist can understand.

The video clarified some tough concepts and his nifty 3-D diagrams were self-explanatory. The video briefly touches on: music, trigonometry, Fourier transform, AM/FM radio signals, sidebands, etc.

Mark is an electronics engineer who recently published the book, "How the Fourier Transform Works". He also has a great "Circle of Fifths" introduction video for aspiring musicians.

niconiconi:
In a previous project I was trying to build a software-defined radio, and initially I had a hard-time understanding the concepts of negative frequencies, analytic signals, and Hilbert transform. This video could've helped me years ago.
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