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Digital Signal Processing System

Most of the signals encountered in science and engineering are analog in nature. That is the signals are of a continuous variable, such as time or space, and usually take on values in a continuous range. Such signals may be processed directly by appropriate analog  systems.

System

A system may also be defined as a physical device that performs an operation on a signal. For example, a filter used to reduce the noise and interference corrupting a desired information- bearing signal is called a system