Tag Archives: Third-Order

Study and Design of Differential Microphone Arrays

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Jacob Benesty, Jingdong Chen, "Study and Design of Differential Microphone Arrays"
English | 2013 | ISBN-10: 364233752X, 3642427561 | 180 pages | PDF | 6 MB

Study and Design of Differential Microphone Arrays
Microphone arrays have attracted a lot of interest over the last few decades since they have the potential to solve many important problems such as noise reduction/speech enhancement, source separation, dereverberation, spatial sound recording, and source localization/tracking, to name a few. However, the design and implementation of microphone arrays with beamforming algorithms is not a trivial task when it comes to processing broadband signals such as speech. Indeed, in most sensor arrangements, the beamformer output tends to have a frequency-dependent response. One exception, perhaps, is the family of differential microphone arrays (DMAs) who have the promise to form frequency-independent responses. Moreover, they have the potential to attain high directional gains with small and compact apertures. As a result, this type of microphone arrays has drawn much research and development attention recently. This book is intended to provide a systematic study of DMAs from a signal processing perspective. The primary objective is to develop a rigorous but yet simple theory

for the design, implementation, and performance analysis of DMAs. The theory includes some signal processing techniques for the design of commonly used first-order, second-order, third-order, and also the general Nth-order DMAs. For each order, particular examples are given on how to form standard directional patterns such as the dipole, cardioid, supercardioid, hypercardioid, subcardioid, and quadrupole. The study demonstrates the performance of the different order DMAs in terms of beampattern, directivity factor, white noise gain, and gain for point sources. The inherent relationship between differential processing and adaptive beamforming is discussed, which provides a better understanding of DMAs and why they can achieve high directional gain. Finally, we show how to design DMAs that can be robust against white noise amplification.
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“Acoustic Waves: From Microdevices to Helioseismology” ed. by Marco G. Beghi

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"Acoustic Waves: From Microdevices to Helioseismology" ed. by Marco G. Beghi
InTeOpP | 2011 | ISBN: 9533075724 9789533075723 | 665 pages | PDF | 51 MB
This book presents several aspects of the active research ongoing in the field of Acoustic Waves. Theoretical efforts are leading to a deeper understanding of phenomena, also in complicated environments like the solar surface boundary. A whole class of widespread microdevices, including filters and sensors, is based on the behaviour of acoustic waves propagating in thin layers. The search for better performances is driving to new materials for these devices, and to more refined tools for their analysis.

“Acoustic Waves: From Microdevices to Helioseismology” ed. by Marco G. Beghi
Contents
Part 1 Theoretical and Numerical Investigations of Acoustic Waves
1 Analysis of Acoustic Wave in Homogeneous and Inhomogeneous Media Using Finite Element Method
2 Topological Singularities in Acoustic Fields due to Absorption of a Crystal
3 An Operational Approach to the Acoustic Analogy Equations
4 Exact Solutions Expressible in Hyperbolic and Jacobi Elliptic Functions of Some Important Equations of Ion-Acoustic Waves
5 A coustic Wave
Part 2 Acoustic Waves as Investigative Tools
6 Acoustic Waves: A Probe for the Elastic Properties of Films
7 Evaluation Method for Anisotropic Drilling Characteristics of the Formation by Using Acoustic Wave Information
8 Machinery Faults Detection Using Acoustic Emission Signal
9 Compensation of Ultrasound Attenuation in Photoacoustic Imaging
10 Low Frequency Acoustic Devices for Viscoelastic Complex Media Characterization
11 Modeling of Biological Interfacial Processes Using Thickness-Shear Mode Sensors
12 Analysis of Biological Acoustic Waves by Means of the Phase-Sensitivity Technique
13 Photoacoustic Technique Applied to Skin Research: Characterization of Tissue, Topically Applied Products and Transdermal Drug Delivery
14 Acoustic-Gravity Waves in the Ionosphere During Solar Eclipse Events
Part 3 Acoustic Waves as Manipulative Tools
15 Use of Acoustic Waves for Pulsating Water Jet Generation
16 Molecular Desorption by Laser-Driven Acoustic Waves: Analytical Applications and Physical Mechanisms
17 Excitation of Periodical Shock Waves in Solid-State Optical Media (Yb:YAG, Glass) at SBS of Focused Low-Coherent Pump Radiation: Structure Changes, Features of Lasing
18 An Optimal Distribution of Actuatorsin Active Beam Vibration: Some Aspects, Theoretical Considerations
Part 4 Acoustic Wave Based Microdevices
19 Multilayered Structure as a Novel Material for Surface Acoustic Wave Devices: Physical Insight
20 SAW Parameters Analysis and Equivalent Circuit of SAW Device
21 Sources of Third-Order Intermodulation Distortion in Bulk Acoustic Wave Devices: A Phenomenological Approach
22 Shear Mode Piezoelectric Thin Film Resonators
23 Polymer Coated Rayleigh SAW and STW Resonators for Gas Sensor Applications
24 Ultrananocrystalline Diamond as Material for Surface Acoustic Wave Devices
25 Aluminum Nitride (AIN) Film Based Acoustic Devices: Material Synthesis and Device Fabrication
26 Surface Acoustic Wave Devices for Harsh Environment
27 Applications of In-Fiber Acousto-Optic Devices
28 Surface Acoustic Waves and Nano-Electromechanical Systems
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