非均匀二次声源分布下的2.5D高阶Ambisonics声场合成算法

为了提高感兴趣区域音源的声场合成质量,提出了一种非均匀二次声源分布的声场分析与合成方法.首先,将连续二次声源的采样分为两个不同的采样区域,在总扬声器数目一定的情况下,增大感兴趣区域的样点数目并减少感兴趣区域外样点数目.然后,利用采样混叠矩阵的Hermitian特性,使用瑞利熵来估计不同非均匀采样方案的最大误差,以指导非...

Non-Uniform Secondary Source Distribution for 2.5D Higher Order Ambisonics Sound Field Synthesis

In order to improve the sound field synthesis quality of the sound source in the region of interest,a non-uniform secondary source distribution method for sound field analysis and synthesis is proposed.First,the sampling of the continuous secondary source is divided into two different sampling regions.With a certain number of loudspeakers,the number of samples in the region of interest is increased and the number of samples outside the region of interest is reduced.Then,using the Hermitian characteristic of the sampling aliasing matrix,Rayleigh entropy is used to estimate the maximum error of different non-uniform sampling schemes to guide the selection of non-uniform sampling schemes.Finally,the frequency domain calculation method of the driving signal for the non-uniform secondary source distribution is obtained.The experimental results show that the proposed non-uniform distribution method improves the aliasing-free radius by 12.9%~22.6% for the sound sources from the region of interest under the 2.5D circular boundary condition,compared with the optimal modal bandwidth of the uniform distribution.The effectiveness of the proposed method is verified.