book

Essential Guide to Digital Signal Processing, The

by D. Lee Fugal, Richard G. Lyons

May 2014

Intermediate to advanced

208 pages

4h 38m

English

Pearson

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The Phantom TechnologyWhat Is a Signal?Analog and Digital Signals?Digital Signal ProcessingWhat You Should Remember
What Is an Analog Signal?A Temperature Analog SignalAn Audio Analog SignalAn Electrical Analog SignalA Human Speech Analog SignalWhat You Should Remember
FrequencyThe Concept of SpectrumAnalog Signal SpectraWhat You Should Remember
What Is a Digital Signal?How Digital Signals Are GeneratedA Speech Digital SignalAn Example of Digital Signal ProcessingAnother Example of Digital Signal ProcessingTwo Important Aspects of Sampling Analog SignalsSample Rate ConversionWhat You Should Remember

Analog Signal Spectra—A Quick ReviewHow Sampling Affects the Spectra of Digital SignalsThe Spectrum of a Digital Sine Wave SignalThe Spectrum of a Digital Voice SignalThe Spectrum of a Digital Music SignalAnti-Aliasing FiltersAnalog-to-Digital Converter Output NumbersWhat You Should Remember
Computing Digital SpectraA Spectral Computation ExampleA Spectral Analysis ExampleWhat You Should Remember
The Fast Fourier Transform (FFT)—A Quick ReviewThe Continuous Wavelet Transform (CWT)What You Should Remember
Analog FilteringGeneric Filter TypesDigital FilteringWhat You Should Remember
Number SystemsBinary DataWhy Use Binary Numbers?Binary Numbers and Analog-to-Digital ConvertersWhat You Should Remember
Decibels Used to Describe Sound Power ValuesDecibels Used to Measure EarthquakesDecibels Used to Describe Signal AmplitudesDecibels Used to Describe Filters
AM Radio SignalsFM Radio SignalsComparing AM and FM Radio
Unsigned Binary Number FormatSign-Magnitude Binary Number FormatTwo’s Complement Binary Number FormatOffset Binary Number FormatAlternate Binary Number Notation

Content preview from Essential Guide to Digital Signal Processing, The

4. Digital Signals and How They Are Generated

What Is a Digital Signal?

Until the early 1980s, the vast majority of the signals that we experienced in our daily lives, such as light and sound signals, were analog in nature. But the advent of digital clocks, cell phones, portable music players, and digital television has changed much of our world to digital as indicated by Table 1.1 in Chapter 1. So it’s reasonable to ask, “What does the word digital mean? What is a digital signal?” We answer those questions in the following sections.

The Notion of Digital

The development of language is a complicated, and unpredictable, phenomenon. As far as we can tell, our definition of the word digital originated from the notion of counting with your fingers. ...