A study into the design of steerable microphone arrays

• Main Authors: Lai, Chiong Ching (Author), Nordholm, Sven Erik (Author), Leung, Yee Hong (Author)
• Format: Electronic eBook
• Language: English
• Published: Singapore : Springer, [2016]
• Series: SpringerBriefs in electrical and computer engineering. Signal processing.
• Subjects: Microphone arrays.; elektronické knihy; electronic books
• ISBN: 9789811016912; 9789811016899
• ISSN: 2191-8112
• Physical Description: 1 online resource (xi, 116 pages) : illustrations (some color)

The book covers the design formulations for broadband beamformer targeting nearfield and farfield sources. The book content includes background information on the acoustic environment, including propagation medium, the array geometries, signal models and basic beamformer designs. Subsequently it int...

Table of Contents:

• Preface; Contents; Acronyms; 1 Introduction; 1.1 Beamforming; 1.2 Practical Applications; 1.3 Chapter Organisation; References; 2 Acoustic Environment, Source Models and Sensor Arrays Theory; 2.1 Introduction; 2.2 Environment and Channel Modelling; 2.3 Source Models; 2.3.1 Distributed and Point Source; 2.3.2 Nearfield and Farfield Source; 2.4 Sensor Arrays Theory; 2.4.1 Spatial Aliasing; 2.4.2 Array Geometry; 2.5 Spiral Arm Array Geometry; 2.5.1 Ring Radii; 2.5.2 Twist Angle; 2.6 Conclusions; References; 3 Broadband Beamformer Design; 3.1 Introduction; 3.2 Beamformer Structure.
• 3.2.1 Weight-and-Sum Beamformer3.2.2 Filter-and-Sum Beamformer; 3.3 Design Formulation; 3.3.1 Weighted LS Formulation; 3.3.2 Weighted TLS Formulation; 3.4 Mixed Nearfield
• Farfield Design Formulation; 3.5 Performance Metrics; 3.6 Design Examples and Evaluation; 3.7 Conclusions; References; 4 Steerable Broadband Beamformer Design; 4.1 Introduction; 4.2 Beamformer Structure; 4.3 Design Formulations; 4.3.1 Weighted LS Formulation; 4.3.2 Weighted TLS Formulation; 4.4 Mixed Nearfield
• Farfield Design Formulation; 4.5 Steering Function; 4.5.1 Steering Range; 4.5.2 Normalisation of Steering Function.
• 4.6 Performance Metrics4.7 Design Examples and Evaluation; 4.8 Conclusions; References; 5 Robust Formulation; 5.1 Introduction; 5.2 Conventional White Noise Gain Constraint; 5.3 Stochastic Error Model; 5.3.1 Multiplicative Error; 5.3.2 Additive Error; 5.3.3 Multiplicative and Additive Error; 5.4 Robust Formulation Using Stochastic Error Model; 5.4.1 Weighted LS Formulation; 5.4.2 Weighted TLS Formulation; 5.5 Performance Metrics; 5.6 Design Examples and Evaluation; 5.6.1 Design Specifications; 5.6.2 Array Gain and Sensitivity; 5.6.3 Perturbation in Sensor Characteristics.
• 5.6.4 Perturbation in Sensor Positions5.6.5 Perturbation Due to Local Scattering; 5.7 Conclusions; References; 6 Conclusions and Future Work; 6.1 Summary; 6.2 Future Work; 6.3 Final Remarks; References; Appendix A Closed Form Integration for Fixed Beamformer Design; Appendix B Closed Form Integrations for Steerable Beamformer Design.