May 2010
Beginner to intermediate
264 pages
7h 26m
English
Content preview from Digital Signal Processing 101Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 2Complex Numbers and Exponentials
Complex numbers are among those things many of us were taught a long time ago and have long since forgotten. Unfortunately, they are important in digital communications and DSP, so we need to resurrect them.
What we were taught—and some of us vaguely remember—is that a complex number has a “real” and an “imaginary” part, and the imaginary part is the square root of a negative number, which is really a nonexistent number. This explanation right away sounds fishy, and while it’s technically true, there is a much more intuitive way of looking at it.
The whole reason for complex numbers is that we are going to need a two-dimensional number plane to understand DSP. The traditional number line extends from ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.