An analog signal uses some property of the medium to communicate signal information. In an electrical signal, the voltage, current, or frequency of the signal can be varied to represent the information. There are two main types of signals used in electronics- analog and digital signals. In this article, we will know what is Analog and Digital signal and what is the difference between the two.
What Is Analog Signal
An analog signal is any continuous signal that represents some other quantity. In contrast, a digital signal represents the original time-varying quantity as a sampled sequence of quantized values. This imposes some bandwidth and dynamic range constraints on the representation, but can avoid further electronic noise and distortion, unlike analog signals.
The term analog signal usually refers to electrical signals; However, mechanical, pneumatic, hydraulic and other systems may also give or be considered analog signals. For example, in an analog audio signal, the instantaneous signal voltage varies continuously with the pressure of the sound waves.
An analog signal uses some property of the medium to communicate signal information. For example, an aneroid barometer uses rotary position as a signal to provide pressure information. In an electrical signal, the voltage, current, or frequency of the signal can be varied to represent the information.
Any information that can be communicated by an analog signal, such a signal may be a measured response to a change in physical variable, such as sound, light, temperature, position or pressure. The physical variable is converted into an analog signal by the transducer.
What Is Digital Signal
A digital signal is a signal that represents data as a sequence of discrete values; At any given time it can only accept, at most, one of a limited number of values. This is in contrast to an analog signal, which represents continuous values, in that any time it represents a real number within a continuous range of values.
Simple digital signals represent information in discrete bands of analog levels. All levels within a band of values represent the same information state. In most digital circuits, a signal can have two potentially valid values; This is called a binary signal or a logic signal. While digital signals with more than two states are sometimes used, circuitry using such signals is called multivalued logic.
In digital electronics, a digital signal is a pulse train, i.e. a sequence of fixed-width square wave electrical pulses or light pulses, each occupying one of a discrete number of amplitude levels. A special case is a logic signal or a binary signal, which varies between a low and a high signal level.
Read Also –