Signal
"In information theory a signal is a flow of information". (Wikipedia, 2005). In information theory are signals opposed to noise.
A signal is a kind of sign intended to warn, to give a command or to bring a message. The Russian psychologist Ivan Pavlov described human language as a second-order signal system.
Literature:
Wikipedia, the free encyclopedia. (2005). Signal (information theory). http://en.wikipedia.org/wiki/Signal_%28information_theory%29
Birger Hjørland
Last edited: 18-05-2006