Digital Signal Processing

Abstract

In many fields of science and engineering, there is often a requirement to transform a signal, continuous or discrete, into a form which is suitable for a particular application. In a signal processing application, for instance, a given signal may contain undesirable disturbances (noise) mixed in with desirable information. It is then necessary to process the signal in order to pass (extract) only the useful information and block (reject) the noise. The system or device that accomplishes this is called a filter. A radio receiver, for instance, uses filters in order to pass the band of frequencies transmitted by the radio station we want to hear and to reject noise and frequencies transmitted by other radio stations. A control system, for another example, uses filters to modify the dynamics of a given process and thus make the performance of the overall system satisfactory.