平面声场中四传声器阵列理论精度的对比分析

Comparative analysis of the theoretical accuracy for two four-microphone probes in plane sound field

主要探讨了两种四传声器阵列的理论精度,针对相应的传声器布置形式进行数值计算,比较了正四面体和直角四面体传声器探头在不同工况下的幅值误差和方向误差。结果表明,在平面波作用下,1~4 k Hz范围内正四面体传声器的幅值误差小于直角四传声器,且两者均小于1 d B,外接球心位置的幅值精度在高频段优势明显;当频率小于5 k Hz时,方向误差均控制在2°以内,因此可以满足相关的建筑声学测试要求。

The sound intensity measurement accuracies of tetrahedral and orthogonal probes are compared according to the numerical calculations of relative probes＇ positions. The errors of amplitude and directional angle are also compared for the two probes under different conditions. The results show that the magnitude error of the tetrahedral probe is less than that of the orthogonal probe for plane wave in the frequency range of I to 4 kHz, but both are less than 1 dB, which means that the center of the circumscribed sphere has higher accuracy in amplitude at high frequencies. Whenf is less than 0.9, the error of the directional angle for the two probes can be controlled within 2°, and so they can be used in the architecture acoustical measurement.