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Tables of Contents for Active Noise Control Primer
Chapter/Section Title
Page #
Page Count
Series Preface
vii
Preface
ix
Introduction
1
6
Welcome to the World of Active Noise Control!
1
1
Chapter Summary
2
1
Do I Have to Read the Whole Book?
3
1
What Is Active Noise Control?
3
1
Adaptive Feedforward Active Control Noise
4
1
Advanced Reading
5
2
Background: Fundamentals of Sound
7
29
What Is Sound?
7
1
What Is Noise?
8
1
Quantifying Sound Levels
8
2
Sound Waves
10
4
Frequency Analysis
14
1
Sine Waves
15
4
Fourier Analysis
19
2
Harmonics
21
6
Anything that Rotates
22
2
Many Devices Which Use Mains Electricity
24
1
Devices Which Are Driven Beyond Their Capabilities
25
2
Human Perception of Sound
27
3
Acceptable Sound Levels
30
6
Fundamentals of Noise Control
36
10
Prerequisite Discussion: Power and Impedance
36
4
The Magnitude of Acoustic Power
40
1
Decibel Units for Acoustic Power
40
1
Power, Pressure, and Hearing Loss
41
1
Real and Imaginary Impedance
42
1
What Is Noise Control?
43
1
What Is Passive Noise Control?
43
1
What is Active Noise Control?
44
2
Free Space Noise Control
46
21
Passive Noise Control Approaches
46
5
Active Control Approaches
51
16
Enclosed Space Noise Control
67
14
Where Does the Sound Come From?
67
1
How Does the Sound Get Out Again?
68
1
How Does the Sound Field Arrange Itself?
69
5
Passive Noise Control Approaches
74
2
Active Noise Control Approaches
76
5
Control of Sound Propagation in Ducts
81
14
Sound Fields in Ducts
81
1
Modes in Ducts
82
1
Impedance in Ducts
83
1
Passive Noise Control Approaches
84
1
Sidebranch Resonator
85
1
Expansion Chamber
86
1
Helmholtz Filter
87
1
Dissipative Passive Control Techniques
88
1
Active Noise Control Approaches
89
1
Reference and Error Signal Quality
90
1
Reference Sensor/Control Source Separation Distance
91
1
Control Source Position in the Duct
92
1
Duct Response Characteristics
92
3
Active Noise Controller Overview
95
18
Some Important Facts
96
1
Digital System Requirements
96
8
Controller Output (Digital Control Filter) Requirements
104
3
Adaptive Algorithm Requirements
107
6
Controller Fundamentals
113
44
General Control System Outlines and Definitions
114
5
Physical System Limitations
119
2
Interfacing a Digital System
121
1
Background
121
3
Required Additions for Digital Control
124
3
Overview of the Controller
127
1
The Digital Filter
128
7
What Is a Digital Filter?
128
4
Specifying the ``Appropriate'' Digital Filter
132
2
Specifying the Digital Filter Length
134
1
The Adaptive Algorithm
135
11
Background: Making Use of Adaptive Signal Processing
135
1
Gradient Descent Algorithms
136
3
Evaluating the Gradient
139
1
The Convergence Coefficient
140
3
Quantization Errors and Leakage
143
2
Slowing Down the Algorithm to Improve Performance
145
1
Cancellation Path Modeler
146
11
Selecting the Sample Rate
150
4
So What Is the Optimum Sample Rate?
154
3
Index
157