Spatial Audio Estimation Based on Dual Microphone Arrays
Bo Wang, Ling-Yi Xu, Li Wei Hu, Huawei Wang, Bing Ruan, Yeqing Wan · 2025
In this paper, a spatial audio estimation method based on a bilinear 4-element microphone array is proposed to realize that inter-audio estimation through a four-step process: 1) time-domain alignment of multi-channel audio signals by using a mutual correlation algorithm; 2) calculation of signal propagation delays based on the geometrical relationship of the spatial points with the sound source and the microphone; 3) inference of the spectrum at any spatial location by means of the Fourier transform and the frequency-domain beamforming technique; 4) Finally reconstruct the time-domain signal at the spatial location by inverse Fourier transform and calculate the sound pressure level. The experimental validation shows that the absolute value of the error between the reconstructed signal sound pressure level and the real value is less than 3 dB, and the average percentage error is about 2%. In the 100-800Hz pure tone test, the law of sound pressure level change with frequency at any point in space is further revealed.