Digital Signal Processing Reference
In-Depth Information
CHAPTER
1
Introduction to Digital Signal
Processing
CHAPTER OUTLINE
1.1 Basic Concepts of Digital Signal Processing .......................................................................................
1
1.2 Basic Digital Signal Processing Examples in Block Diagrams...............................................................
3
1.2.1 Digital Filtering .............................................................................................................3
1.2.2 Signal Frequency (Spectrum) Analysis.............................................................................3
1.3 Overview of Typical Digital Signal Processing in Real-World Applications ............................................
5
1.3.1 Digital Crossover Audio System.......................................................................................5
1.3.2 Interference Cancellation in Electrocardiography ..............................................................5
1.3.3 Speech Coding and Compression ....................................................................................7
1.3.4 Compact-Disc Recording System ....................................................................................7
1.3.5 Vibration Signature Analysis for Defective Gear Teeth .......................................................9
1.3.6 Digital Photo Image Enhancement ..................................................................................9
1.4 Digital Signal Processing Applications ............................................................................................
12
1.5 Summary .......................................................................................................................................
13
OBJECTIVES:
This chapter introduces concepts of digital signal processing (DSP) and reviews an overall picture of its
applications. Illustrative application examples include digital noise filtering, signal frequency analysis,
speech and audio compression, biomedical signal processing such as interference cancellation in elec-
trocardiography, compact-disc recording, and image enhancement.
1.1
BASIC CONCEPTS OF DIGITAL SIGNAL PROCESSING
Digital signal processing (DSP) technology and its advancements have dramatically impacted our
modern society everywhere. Without DSP, we would not have digital/Internet audio and video; digital
recording; CD, DVD, and MP3 players; iPhone and iPad; digital cameras; digital and cellular tele-
phones; digital satellite and TV; or wired and wireless networks. Medical instruments would be less
efficient or unable to provide useful information for precise diagnoses if there were no digital elec-
trocardiography (ECG) analyzers, digital X-rays, and medical image systems. We would also live in
many less efficient ways, since we would not be equipped with voice recognition systems, speech
synthesis systems, and image and video editing systems. Without DSP, scientists, engineers, and
technologists would have no powerful tools to analyze and visualize the data necessary for their
designs, and so on.
