Acoustic Waves Generated by Parametric Array Loudspeakers 1st Edition by Jiaxin Zhong, Xiaojun Qiu ISBN 1032408529 9781032408521

Acoustic Waves Generated by Parametric Array Loudspeakers 1st Edition by Jiaxin Zhong, Xiaojun Qiu – Ebook PDF Instant Download/Delivery: 1032408529, 9781032408521
Full download Acoustic Waves Generated by Parametric Array Loudspeakers 1st Edition after payment

Product details:

ISBN 10: 1032408529 
ISBN 13: 9781032408521
Author: Jiaxin Zhong, Xiaojun Qiu

Parametric array loudspeakers (PALs) are capable of generating highly directional audio beams from nonlinear interactions of intense airborne ultrasound waves. This unique capability holds great potential in audio engineering. This book systematically introduces the physical principles of acoustics waves generated by PALs, along with the commonly used and the state-of-the-art numerical models, such as the Westervelt model, the convolution directivity model, the Gaussian beam expansion method, and the spherical wave expansion method. The properties of sound fields generated by PALs are analyzed. Also analyzed are various phenomena including the reflection of acoustics waves generated by PALs from a surface, transmission through a thin partition, scattering by a rigid sphere, and propagation in rooms. Furthermore, the steering and focusing of acoustics waves generated by PALs and potential applications of PALs in active sound control are investigated. Finally, the implementation issues of hardware, signal processing techniques, measurement, and safety are discussed. The book is tailored to meet the needs of researchers in this field, as well as audio practitioners and acoustics engineers.

Acoustic Waves Generated by Parametric Array Loudspeakers 1st Table of contents:

Chapter 1 Physical Basis for Parametric Array Loudspeakers (PALs)
1.1 Introduction
1.1.1 Parametric Acoustic Arrays
1.1.2 Applications of Parametric Acoustic Arrays
1.1.3 Parametric Array Loudspeakers
1.1.4 Applications of Parametric Array Loudspeakers
1.1.5 Commercial Product Examples of Parametric Array Loudspeakers
1.2 Fundamental Equations for Acoustic Waves in Fluids
1.2.1 Conservation of Mass—Continuity Equation
1.2.2 Conservation of Momentum—Navier-Stokes Equations
1.2.3 Conservation of Energy—Kirchhoff-Fourier Equation
1.2.4 State Equation of the Fluid
1.2.5 Second-Order Approximation
1.3 Nonlinear Equations for PALs
1.3.1 General Second-Order Nonlinear Wave Equation
1.3.2 Kuznetsov Equation
1.3.3 Westervelt Equation
1.3.4 Khokhlov-Zabolotskaya-Kuznetsov Equation
1.4 Quasilinear Solution
1.4.1 Time-Domain Solutions
1.4.2 Frequency-Domain Solutions
1.4.3 Validity of the Quasilinear Approximation
1.5 Summary
Chapter 2 Numerical Models for Parametric Array Loudspeakers
2.1 Introduction
2.2 Direct Integration Method (DIM)
2.2.1 Kirchhoff-Helmholtz Integral Equation
2.2.2 Two-Dimensional Model
2.2.3 Three-Dimensional Model
2.2.4 Westervelt’s Solutions for Collimated Beams
2.2.5 Remarks
2.3 Convolution Directivity Model (CDM)
2.3.1 Two-Dimensional Model
2.3.2 Three-Dimensional Model
2.3.3 Three-Dimensional Axisymmetric model
2.3.4 Directivities of Typical Sources
2.3.5 Remarks
2.4 Gaussian Beam Expansion (GBE) Method
2.4.1 GBE Coefficients and Paraxial Approximations
2.4.2 Two-Dimensional Model
2.4.3 Circular PAL with a Uniform Profile
2.4.4 Rectangular PAL
2.4.5 Remarks
2.5 Cylindrical Wave Expansion (CWE) Method
2.5.1 Framework of the CWE Method
2.5.2 Ultrasound Field
2.5.3 Audio Sound Field
2.5.4 Remarks
2.6 Spherical Wave Expansion (SWE) Method
2.6.1 Framework of the SWE Method
2.6.2 Axisymmetric Profile
2.6.3 Non-axisymmetric Profile
2.6.4 Remarks
2.7 Other Methods
2.8 Summary
Chapter 3 Sound Fields Generated by PALs in Free Space
3.1 Introduction
3.2 Sound Field in Front Side of a Baffled PAL
3.2.1 Near Field, Westervelt Far Field, and Inverse-Law Far Field
3.2.2 Transition Distance from the Near Field to the Westervelt Far Field
3.2.3 Transition Distance from the Westervelt Far Field to the Inverse-Law Far Field
3.2.4 Sound Field Distributions
3.2.5 Remarks
3.3 Sound Field Behind a Non-Baffled PAL
3.3.1 Prediction Model Based on the Disk Scattering Theory
3.3.2 Non-Baffled Model for a Conventional Loudspeaker
3.3.3 Results and Discussions
3.3.4 Remarks
3.4 Sound Power Generated by a PAL
3.4.1 Challenges of the Sound Power Measurement for PALs
3.4.2 Sound Power
3.4.3 Conversion Efficiency from Ultrasound to Audio Sound
3.4.4 Remarks
3.5 Summary
Chapter 4 Reflection, Transmission, and Scattering of Acoustic Waves Generated by PALs
4.1 Introduction
4.2 Reflection from a Surface
4.2.1 Problem Description
4.2.2 Theoretical Model Based on the Image Source Method
4.2.3 Reflected Sound Fields
4.2.4 Remarks
4.3 Transmission through a Thin Partition
4.3.1 Problem Description
4.3.2 Theoretical Model
4.3.3 Transmitted Sound Fields
4.3.4 Remarks
4.4 Scattering by a Rigid Sphere
4.4.1 Problem Description
4.4.2 Theoretical Model
4.4.3 Scattered Sound Fields
4.4.4 Remarks
4.5 Summary
Chapter 5 Sound Fields Generated by PALs in Rooms
5.1 Introduction
5.2 Conventional Linear Sources in a Rectangular Room
5.2.1 Modal Expansion Method
5.2.2 Directional Sources in a 2D Rectangular Room
5.2.3 Directional Sources in a 3D Rectangular Room
5.3 PALs in a Rectangular Room
5.3.1 Modal Expansion Method
5.3.2 2D Sound Fields
5.3.3 3D Sound Fields
5.3.4 Remarks
5.4 Summary
Chapter 6 Steerable and Focusing PALs
6.1 Introduction
6.1.1 Steerable PALs
6.1.2 Focusing PALs
6.2 Two-Dimensional Beam Steering
6.2.1 Problem Description
6.2.2 Ultrasound Field
6.2.3 Audio Sound in the Far Field
6.2.4 Audio Sound in the Near Field
6.2.5 Remarks
6.3 Three-Dimensional Beam Steering
6.3.1 Problem Description
6.3.2 Audio Sound in the Far Field
6.3.3 Audio Sound in the Near Field
6.3.4 Remarks
6.4 Grating Lobe and Suppression Techniques
6.4.1 Problem Description
6.4.2 Uniform Array Generating Grating Lobes
6.4.3 Optimal Array Obtained Using Simulated Annealing
6.4.4 Performance of the Optimal Sparse Random 0 Array
6.4.5 Experimental Validation
6.4.6 Remarks
6.5 Beam Focusing
6.5.1 Problem Description
6.5.2 Influence of Local Effects
6.5.3 Focusing Audio Sound Field
6.5.4 Experimental Observation of the Beam Focusing
6.5.5 Remarks
6.6 Summary
Chapter 7 Active Noise Control with PALs
7.1 Introduction
7.1.1 ANC Systems and Spillover Effects
7.1.2 ANC Using Directional Loudspeakers
7.2 ANC Using One PAL
7.2.1 Problem Description and Theoretical Framework
7.2.2 Control Performance
7.2.3 Control of Broadband Noise Combining with a Remote Error Sensing Strategy
7.2.4 Remarks
7.3 Binaural ANC Using Two PALs
7.4 ANC Using Multiple PALs
7.4.1 Problem Description
7.4.2 Theoretical Framework
7.4.3 Quiet Zone and Related Metrics
7.4.4 Two-Dimensional Configuration
7.4.5 Three-Dimensional Configuration
7.4.6 Remarks
7.5 Summary
Chapter 8 Implementation of PALs
8.1 Introduction
8.2 Hardware
8.2.1 Ultrasonic Emitters
8.2.2 Power Amplifiers
8.2.3 Signal Processors
8.3 Signal Processing and Modulation Algorithms
8.3.1 Quasilinear Solutions in the Time Domain
8.3.2 Preprocessing Methods
8.3.3 Phased Array PALs
8.4 Spurious Sound in Measurement
8.4.1 Orientation of the Measurement Microphone
8.4.2 Physical Acoustic Filters
8.4.3 Phase-Cancelation Method
8.4.4 Optical Interferometery
8.5 Safety Issues
8.6 Summary

People also search for Acoustic Waves Generated by Parametric Array Loudspeakers 1st:

acoustic waves generated by parametric array
    
acoustic waves generated by parametric array loudspeakers
    
what are the acoustic parameters
    
parametric acoustic array
    
acoustic array

Tags: Jiaxin Zhong, Xiaojun Qiu, Acoustic, Parametric