Digital Signal is a signal which can only take discrete levels. A digitized analog signal or an arbitrary bit stream are digital signals. A signal generated by a modem, is in the first case considered as a digital signal, and in the second case as converted to an analog signal. A waveform that switches between two voltage levels representing the two states of a Boolean value (0 and 1) is referred to as a digital signal. The clock signal is a special digital signal that is used to synchronize digital circuits. The mathematical manipulation of an information signal to modify or improve it is called Digital signal processing. Digital signal transmission has many advantages over analog signal transmission. Applications of digital technology include the continuously growing number of PC’s, the communication network ISDN and the increasing use of digital control stations (Direct Digital Control: DDC).
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