Trying to explain D.C. signals
I'm trying to explain D.C. signals for my telephone history series. Take a look below to see if you can understand what I write:
Analog transmission in telephone working. At the top of the illustration we depict direct current as a flat line. D.C. is the steady and continuous current your telephone company provides to carry your conversation. The middle line shows what talking looks like. As in all things analog, it looks like a wave. The third line shows that when you talk the telephone impresses that analog wave on the direct current provided. Thus, your voice varies the telephone's electrical current. Click here for another diagram that complements this illustration. Comments? Corrections?
