Download PDF by Chiong Ching Lai, Sven Erik Nordholm, Yee Hong Leung: A Study into the Design of Steerable Microphone Arrays

By Chiong Ching Lai, Sven Erik Nordholm, Yee Hong Leung

ISBN-10: 9811016895

ISBN-13: 9789811016899

ISBN-10: 9811016917

ISBN-13: 9789811016912

The ebook covers the layout formulations for broadband beamformer focusing on nearfield and farfield resources. The ebook content material contains historical past details at the acoustic surroundings, together with propagation medium, the array geometries, sign types and easy beamformer designs. accordingly 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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Signal Process. 46(8), 2147–2156 (1998) 6. R. A. Goubran, M. El-Tanany, Robust near-field adaptive beamforming with distance discrimination. IEEE Trans. Speech Audio Process. 12(5), 478–488 (2004) 26 2 Acoustic Environment, Source Models and Sensor Arrays Theory 7. H. Chen, S. Wee, Y. Zhu Liang, Optimal design of nearfield wideband beamformers robust against errors in microphone array characteristics. IEEE Trans. Circuits Syst. I, Reg. Papers 54(9), 1950–1959 (2007) 8. P. Hacker, H. Schrank, Range distance requirements for measuring low and ultralow sidelobe antenna patterns.

Signal Process. 57(4), 1383–1395 (2009) 15. A. Manikas, A. Alexiou, H. Karimi, Comparison of the ultimate direction-finding capabilities of a number of planar array geometries, in Proceedings of the IEE Radar, Sonar and Navigation, vol. 144, no. 6, Dec 1997, pp. 321–329 16. A. Sleiman, A. Manikas, The impact of sensor positioning on the array manifold. IEEE Trans. Antennas Propag. 51(9), 2227–2237 (2003) 17. M. C. S. Allen, Effect of surface treatment on array microphone selfnoise, in Proceedings of the AIAA/CEAS Aeroacoustics Conference, Lahaina, HI, 12–14 June 2000 18.

This observation is in agreement with the array gain plot in Fig. e. SNR improvement) at frequency above 1800 Hz but negative array gain at low frequencies. This negative gain implies that any mismatch or error between the design model and practical environment will be significantly amplified, thus degrading the SNR at low frequencies. This is because at low frequencies, the designs behave as super-directive beamformers which are sensitive to any mismatch, in this case, the mismatch in r between the design specifications and the actual operating r.

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A Study into the Design of Steerable Microphone Arrays by Chiong Ching Lai, Sven Erik Nordholm, Yee Hong Leung

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