Zhu, Q, Qiu, X, Coleman, P & Burnett, I 2020, 'A comparison between two modal domain methods for personal audio reproduction', JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 147, no. 1, pp. 161-173.View/Download from: Publisher's site
Han, Z, Wu, M, Zhu, Q & Yang, J 2019, 'Three-dimensional wave-domain acoustic contrast control using a circular loudspeaker array.', The Journal of the Acoustical Society of America, vol. 145, no. 6.View/Download from: Publisher's site
This paper proposes a three-dimensional wave-domain acoustic contrast control method to reproduce a multizone sound field using a circular loudspeaker array. In this method, sound field analysis is based on spherical harmonic decomposition, and the loudspeaker weights are obtained by maximizing the acoustic energy contrast between the predefined bright zone and dark zone. Simulation results show that the proposed method provides good multizone separation performance over a large spatial region and requires lower-order spherical harmonics, resulting in a much lower number of microphones required to measure the acoustic transfer functions.
Zhu, Q, Coleman, P, Qiu, X, Wu, M, Yang, J & Burnett, I 2019, 'Robust Personal Audio Geometry Optimization in the SVD-Based Modal Domain', IEEE/ACM Transactions on Audio Speech and Language Processing, vol. 27, no. 3, pp. 610-620.View/Download from: Publisher's site
© 2014 IEEE. Personal audio generates sound zones in a shared space to provide private and personalized listening experiences with minimized interference between consumers. Regularization has been commonly used to increase the robustness of such systems against potential perturbations in the sound reproduction. However, the performance is limited by the system geometry such as the number and location of the loudspeakers and controlled zones. This paper proposes a geometry optimization method to find the most geometrically robust approach for personal audio amongst all available candidate system placements. The proposed method aims to approach the most 'natural' sound reproduction so that the solo control of the listening zone coincidently accompanies the preferred quiet zone. Being formulated in the SVD-based modal domain, the method is demonstrated by applications in three typical personal audio optimizations, i.e., the acoustic contrast control, the pressure matching, and the planarity control. Simulation results show that the proposed method can obtain the system geometry with better avoidance of 'occlusion,' improved robustness to regularization, and improved broadband equalization.
Han, Z, Wu, M, Zhu, Q & Yang, J 2018, 'Two-dimensional multizone sound field reproduction using a wave-domain method.', The Journal of the Acoustical Society of America, vol. 144, no. 3, pp. EL185-EL185.View/Download from: Publisher's site
This paper addresses a two-dimensional multizone sound field reproduction approach using a wave-domain method. The desired sound fields in the bright and dark zones are described as orthogonal expansions of basis functions over the regions. The loudspeaker weights are obtained by maximizing the contrast among multiple zones in the wave domain. Simulation results demonstrate that compared with the conventional acoustic contrast control approach, the proposed method improves the level of acoustic contrast and array gain over the entire control region and is less sensitive to the selection of the regularization parameter.
Lu, L, Sun, H, Wu, M, Zhu, Q & Yang, J 2017, 'A modified electro-acoustical reciprocity method for measuring low-frequency sound source in arbitrary surroundings', APPLIED ACOUSTICS, vol. 116, pp. 1-8.View/Download from: Publisher's site
Zhu, Q, Coleman, P, Wu, M & Yang, J 2017, 'Robust Acoustic Contrast Control with Reduced In-situ Measurement by Acoustic Modeling', JOURNAL OF THE AUDIO ENGINEERING SOCIETY, vol. 65, no. 6, pp. 460-473.View/Download from: Publisher's site
Qiu, X, Zhu, Q, Wang, S & Zhong, J 2019, 'A case study on the new reverberation room built in University of Technology Sydney', Proceedings of the 23rd International Congress on Acoustics, International Congress on Acoustics, EEA, Aachen, Germany.
A new reverberation room has just been built at Centre for Audio, Acoustics and Vibration in University of Technology Sydney. The paper reports some key parameters of the room, which include the background noise and its spectrum, the number of modes in low frequency bands, the cut-off frequency, the standard deviation of the spatial variations of the reverberant field, the decay curves of the sound pressure level versus time, the reverberation times, and the absorption coefficients. These parameters are compared with the published data of other reverberation rooms and some important issues for making accurate measurements are discussed.
Zhu, Q, Qiu, X, Coleman, P & Burnett, I 2019, 'Reducing Transfer Function Measurement in Local Sound Field Reproduction using Acoustic Modelling', Proceedings fo the 23rd International Congress on Acoustics, International Congress on Acoustics, EAA, Aachen, Germany, pp. 2684-2689.
Broadband local sound field reproduction over an extended spatial region is a challenging problem, when only limited transfer function measurement is available. In this paper, an acoustic modelling based approach is proposed to reduce the required transfer function measurements in the local sound field reproduction. The proposed method only requires measuring the transfer functions from each source to a few samples over the boundary of the controlled region, and the transfer functions to the samples inside the controlled region are estimated through an efficient acoustic modelling. The simulation demonstrates that the proposed method requires less transfer function measurement than existing methods such as the least squares and the spatial harmonic decomposition methods.
Zhu, Q, Coleman, P, Wu, M & Yang, J 2016, 'Robust personal audio reproduction based on acoustic transfer function modelling', Proceedings of the AES International Conference.
Personal audio systems generate a local sound field for a listener while attenuating the sound energy at predefined quiet zones. Their performance can be sensitive to errors in the acoustic transfer functions between the sources and the zones. In this paper, we model the acoustic transfer functions as a superposition of multipoles with a term to describe errors in the actual gain and phase. We then propose a design framework for robust reproduction, incorporating additional prior knowledge about the error distribution where available. We combine acoustic contrast control with worst-case and probability-model optimization, exploiting limited knowledge of the error distribution. Monte-Carlo simulations over 10000 test cases show that the method increases system robustness when errors are present in the assumed transfer functions.
Zhu, Q, Wu, M, Lu, L & Yang, J 2015, 'Measurement of loudspeaker radiation patterns using planar microphone arrays', INTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering.
© 2015 by ASME. The measurements of the spatial directivity and frequency response of a sound source are important in sound field reconstruction and noise control. General approaches for obtaining this spatial radiation feature usually require measuring acoustic pressure or velocity on spherical surfaces surrounding the tested source. Due to cost and limitation on measuring condition, the spherical surface measurements are not flexible for in-situ measurement. This paper investigates the link between spherical arrays and planar arrays from a new perspective and proposes a method for measuring radiation patterns of sound sources through planar microphone arrays. Uniformly-spaced arrays and concentric-ring arrays are discussed regarding to their accuracies in estimating coefficients of radiation patterns. Different configurations of planar arrays, such as one-layer array, double-layer array and one-layer array with image method, are also compared by simulation. Considering the convenience of planar arrays over spherical arrays, this method is promising in practice.