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Simple digital signals represent information in discrete bands of analog levels. In signal processing, a digital signal is an abstraction that is discrete in time and amplitude, meaning it only exists at certain time instants. A digital signal is an abstraction which is discrete in time and amplitude. The signal’s value only exists at regular time intervals, since only the values of the corresponding physical signal at those sampled moments are significant for further digital processing. The digital signal is a sequence of codes drawn from a finite set of values. In communications, sources of interference are usually present, and noise is frequently a significant problem. The main advantages of digital signals for communications are often considered to be the immunity to noise that it may be possible to provide, and the ability, in many cases such as with audio and video data, to use data compression to greatly decrease the bandwidth that is required on the communication media.
The image shown can be considered the waveform of a clock signal. Logic changes are triggered either by the rising edge or the falling edge. Falling edge: the transition from a high voltage to a low one. Although in a highly simplified and idealized model of a digital circuit we may wish for these transitions to occur instantaneously, no real world circuit is purely resistive and therefore no circuit can instantly change voltage levels. A threshold is designed for each logic family. To create a digital signal, an analog signal must be modulated with a control signal to produce it. DC signal, so that high voltages are a ‘1’ and low voltages are ‘0’.