2006-10-02 21:40:44 · 3 answers · asked by toto fofo 1 in Science & Mathematics ➔ Engineering
Hey guy, any communication which is not analogic i.e. which uses 1 or 0 only two state value instead of waves...
2006-10-02 23:07:03 · answer #1 · answered by IQEinsten 2 · 0⤊ 1⤋
Digital communications in simplest terms is anything not analog communications.
While it does include a signalling scheme of 0's and 1's, digital communications is not only about binary encoding. There are schemes out there that use 4 values, 16 values, heck even 256 values. Digital comm. is about reliably communicating over some channel. The signal that is transmitted is actually an analog signal. A digital receiver must figure out, typically from the amount of energy received, what signal was sent.
The usual process is to take a data stream and compress it. This will reduce the redundacy. Then you encode it with an error correction scheme. Apply some channel shaping signal. Transmit. Receive and do the reverse.
Go to any college book store and you'll find books on the basics.
2006-10-03 03:33:25 · answer #2 · answered by cw 3 · 0⤊ 1⤋
Because sound waves, and especially the nuances in human language, would use up a huge processing power in electronics, the digital language has been defined.
It is a series of "1" and "0" which represent "ON" and "OFF", which is called the Binary Code (see http://www.theproblemsite.com/codes/binary.asp).
But this creates another problem: The extreme long chains of 1s and 0s are difficult to program and lead to lots of mistakes. Therefore the hexadecimal code was "invented" for easier handling. The word "Yahoo" would then look like this 59 61 68 6F 6F (see http://www.theproblemsite.com/codes/hex.asp)
2006-10-03 01:00:09 · answer #3 · answered by Marianna 6 · 0⤊ 1⤋