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Contents Chapter 1 - Basic Techniques 1 A Little Mathematics 1 The Fourier Transform and Fourier Series 2 Orthogonal Functions 4 Orthogonal Coordinate Systems 5 Electronic Basics 7 Passive Circuits 8 Active Circuits 11 Newton's Equations 15 The Simple Harmonic Oscillator 16 Coupled Systems 17 Basic T-Matrices 19 Series and Parallel Elements in a T-matrix 20 Correlation and Spectral Analysis 21 Modeling Transfer Functions 23 Summary 25 Chapter 2 - Transducer Mechanisms 26 Moving Coil Motor Structure 26 Variable Reluctance Motor Structure 27 Magnetic Circuits 30 The Electrostatic Motor 34 The Piezoelectric Motor Structure, 36 A Simply Supported Piston 38 A Simple Driven Piston Example 39 Summary 41 Chapter 3 - Acoustics 42 The Wave Equation 42 The Helmholtz Equation in Rectangular Coordinates 43 Cylindrical Coordinates 46 Spherical Coordinates 49 A Spherical Example 51 A Cylindrical Example 58 The Cylindrical Near Field 65 Summary 70 Chapter 4 - Simple Radiation 71 Circular Disk 71 Examples of Circular Aperture Radiation 75 The Rectangular Aperture As a Transform Pair 78 Generalized Rectangular Radiation 80 Transform Relationships for Circular Apertures 83 Non-planar Sources in a Flat baffle 85 Summary 87 Chapter 5 - Enclosures 89 The Simple Closed Box 89 An Enclosure in T-matrix Format 95 T-matrix and Lumped Parameter 96 A Ported Enclosure Using T-Matrices. 100 The Mechanical Acoustical Interface 103 Front and Rear Port Radiation 105 General Enclosure Types, 108 Summary 125 Chapter 6 - Waveguides 126 Historical Notes 126 Waveguide Theory 130 Waveguide Geometries 136 The Oblate Spheroidal Waveguide 137 Approximate Numerical Calculations, 147 Treatment of Mouth Diffraction 152 Diffraction Horns 161 Summary 163 Chapter 7 - Crossovers 164 Background 164 Two-Way Crossovers 166 Examples 169 Passive Electrical Effects 173 Acoustic Filters As Crossover Components 178 Summary 179 Chapter 8 - Room Acoustics 181 The Rectangular Room 181 A Wall With an Impedance 189 Fundamental Concepts in Small Room Acoustics 192 Source Placement 196 Summary 202 Chapter 9 - Transducer Arrays 203 Simple Point Source Arrays 203 Spherical Arrays 205 Displaced Spherical Arrays 208 Line Arrays in Cylindrical Coordinates 210 The Effect of Wavefront Curvature on Line Arrays 214 Cardiod Enclosures 216 Passive Low Frequency Directivity 219 Summary 221 Chapter 10 - Distortion 223 Nonlinear Systems Theory 223 Loudspeaker Component Nonlinearity 226 Simulated Results of a Nonlinear Transducer 233 Background On Distortion Perception 236 The Psychoacoustics of Distortion Perception 237 Thermal Nonlinearity 240 Summary 245 Chapter 11 - Microphones 246 Background 246 Microphone Noise 247 A Microphone Example 249 Microphone Enclosures 252 Microphone Pattern Control 254 Microphone Arrays 255 Summary 258 Chapter 12 - Measurements 259 Philosophy of Measurement 259 Measuring the First Mode Parameters 260 Polar Response Measurement 266 Measuring Component Nonlinearity 273 Measuring the Thermal Parameters 277 Summary 278 Chapter 13 - Psychoacoustics 279 Anatomy and Physiology 279 Theories of Hearing 280 Psychoacoustic Measurement Protocols 284 Masking 286 Loudness 289 Binaural Hearing 294 Summary 295 |
Last modified September 21, 2011 by Earl Geddes Copyright 2009, GedLee Associates |
