Analog Signal :
An analog signal is a continuous signal which contains time-varying quantities.
Unlike a digital signal, which has a discrete value at each sampling point,
an analog signal has constant fluctuations.The illustration below shows an
analog pattern (represented as the curve)
alongside a digital pattern (represented as the discrete lines).
An analog signal can be used to measure changes in some physical phenomena such as light,
sound, pressure, or temperature. For instance, an analog microphone can convert sound waves
into an analog signal. Even in digital devices, there is typically some analog component
that is used to take in information from the external world,
which will then get translated into digital form (using an analog-to-digital converter).
Digital Signal :
A digital signal is a signal that is being used to
represent data as a sequence of discrete values at any given time
it can only take on one of a finite number of values.
Although digital representations are discrete ,the information represented
can be either discrete or continuous.
Digital signals are easier and more reliable to transmit with fewer errors.
Digital data has a faster rate of transmission when compared to analog, and gives better productivity.
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