Question

What are digital signals?

Answer 1

Hint: A signal is a function in signal processing that communicates information about a phenomena. It refers to any time-varying voltage, current, or electromagnetic wave that conveys information in electronics and telecommunications. A signal may also be described as a change in a property, such as quantity, that can be observed. Any property, such as a physical quantity that varies in distance or time, can be used as a signal to communicate with other observers.

Complete step by step answer:
A digital signal is one that is used to represent data as a sequence of discrete values; it can only take on one of a finite number of values at any given moment. An analogue signal, on the other hand, represents continuous values; it represents a real number within a continuous range of values at any one moment. Information is represented in discrete bands of analogue values by simple digital signals. Within a range of values, all levels reflect the same information state. The signal in most digital circuits can have two correct values; this is known as a binary signal or logic signal. They are represented by two voltage bands: one near a reference value (usually ground or zero volts) and the other near the supply voltage. These correspond to the Boolean domain values "zero" and "one," thus a binary signal represents one binary digit at any one moment (bit). Small variations in analogue signal levels do not exit the discrete envelope as a result of this discretization, and signal state detecting equipment ignores them. As a result, digital signals are noise-resistant; electrical noise will not harm digital circuits if it is not excessive, but noise will always damage the performance of analogue signals to some extent.

Note:
Multivalued logic is a term used to describe circuitry that uses digital signals with more than two states. Three-valued logic, for example, refers to signals with three potential states. A changeable electric current or voltage, the intensity, phase, or polarisation of an optical or other electromagnetic field, acoustic pressure, the magnetization of a magnetic storage medium, and other physical quantities may be used to represent information in a digital signal. All digital electronics, particularly computer equipment and data transfer, employ digital signals.