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LabVIEW Signal Processing by Mahesh L. Chugani, Abhay R. Samant, Michael Cerna

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Chapter 1. Background

Overview

A digital signal is one that can assume only a finite set of values in both the dependent and independent variables. The independent variable is usually time or space, and the dependent variable is usually amplitude.

Digital signals are everywhere in the world around us. Telephone companies use digital signals to represent the human voice. Radio, TV, and hi-fi sound systems are all gradually converting to the digital domain because of its superior fidelity, noise reduction, and its signal processing flexibility. Transmission of data from satellites to earth ground stations is in digital form. NASA’s pictures of distant planets and outer space are often processed digitally to remove noise and to extract useful information. ...

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