April 2003
Intermediate to advanced
432 pages
11h 10m
English
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ADSL Modulations
There are three basic types of modulations for transmission of sound over a digital medium:
Amplitude modulation (AM)
Frequency modulation (FM)
Phase modulation (PM)
Amplitude modulation uses a voltage change to increase or decrease the size of peaks and valleys. For example, AM radio stations broadcast their programs using amplitude modulation.
Frequency modulation changes frequencies to cause increases and decreases in the space between waves. For example, FM radio stations broadcast their programs using frequency modulation.
Phase modulation shifts the point at which a wave begins by delaying the moment at which a wave begins transmission. Modern analog modems use a constellation of phase and amplitude combinations to represent ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.