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It looks like a windowing function. Used to turn continuous data into segments of data for FFT processing. https://en.m.wikipedia.org/wiki/Window_function

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From that article, that's the original Hamming windows with a_0 = 0.54 and a_1 = 0.46.

> Setting a_0 to approximately 0.54, or more precisely 25/46, produces the Hamming window, proposed by Richard W. Hamming. That choice places a zero-crossing at frequency 5π/(N − 1), which cancels the first sidelobe of the Hann window, giving it a height of about one-fifth that of the Hann window. The Hamming window is often called the Hamming blip when used for pulse shaping.

This is the kind of discovery that settles all debate in my mind that I could have ever been an electrical engineer, or any kind of mathematician.

This is pretty much how I feel every time delving into FFTs. Like, I get the concept, but something in my brain just shuts off when it comes to actually trying to grok it. I do however very much appreciate those that have created software where I just provide --input and they handle the rest.

I also have trouble wrapping my head around all of this, and complex numbers, for that matter. Never mind that I'm employing this stuff all the time in GNU Radio.

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