By Chiong Ching Lai, Sven Erik Nordholm, Yee Hong Leung
The ebook covers the layout formulations for broadband beamformer concentrating on nearfield and farfield resources. The e-book content material comprises historical past info at the acoustic atmosphere, together with propagation medium, the array geometries, sign types and simple beamformer designs. hence it introduces layout formula for nearfield, farfield and combined nearfield-farfield beamformers and extends the layout formula into electronically steerable beamformers. furthermore, a strong formula is brought for all of the designs mentioned.
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Additional resources for A Study into the Design of Steerable Microphone Arrays
6 Design Examples and Evaluation A number of design examples are presented here to illustrate the design formulations discussed. For all the design examples provided in this section, the array geometry used is the spiral arm array discussed in Sect. 5. 1. 2 are provided to cover the nearfieldonly, farfield-only and mixed nearfield–farfield beamformer designs. 11). 2 Design examples for each design formulation Design formulation Name Value of r Weighted LS (Eq. 46) Weighted TLS (Eq. 56) LSnear LSfar LSmixed TLSnear TLSfar TLSmixed Description 1 100 1 ≤ r ≤ 100 1 100 1 ≤ r ≤ 100 Nearfield LS design Farfield LS design Mixed nearfield–farfield LS design Nearfield TLS design Farfield TLS design Mixed nearfield–farfield TLS design and r2 = 2La2 max (f ) .
Proper study and modelling of these environmental factors are necessary to ensure designed beamformers to work. It is also essential to capture and model these factors as close as possible to its practical counterparts so that the designed beamformers, verified theoretically or through simulations, will continue to work when deployed to its real-world application environment. References 1. H. Kuttruff, Room Acoustics, 5th edn. (Spon Press, 2009) 2. M. Kleiner, J. Tichy, Acoustics of Small Rooms (CRC Press, 2014) 3.
56) LSnear LSfar LSmixed TLSnear TLSfar TLSmixed Description 1 100 1 ≤ r ≤ 100 1 100 1 ≤ r ≤ 100 Nearfield LS design Farfield LS design Mixed nearfield–farfield LS design Nearfield TLS design Farfield TLS design Mixed nearfield–farfield TLS design and r2 = 2La2 max (f ) . 69) That is a broadband source, for all f ∈ Ω, is a nearfield source for r < r1 , a farfield source for r > r2 and a mixture of both for r1 ≤ r ≤ r2 . e. 1. 58 m. Hence, r = 1 m is chosen for nearfield-only designs and r = 100 m for farfield-only designs.
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