mweb: info., telecomm.
used to transmit or convey information beyond the range of human voice;
sound or image conveyed in telegraphy, telephony, radio, radar, or television;
detectable physical quantity or impulse (voltage, current, or magnetic field
strength) by which messages or information can be transmitted
something that coveys information;
synthesized to convey information between humans or machines and humans;
time as independent variable (but may be something else actually);
kinds of signals:
- discrete time signals are lists of numbers;
- digital signals are signals that also have discrete amplitude.
proakis and manolakis: any physical variable; any function
(any physical quantity that varies with time, space,
or any other independent variable or variables... a function of one or more
independent variables.)
