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提出了一种吸顶式传声器阵列阵元坐标的标定方法。针对在混响声场中,时延估计算法性能严重下降从而导致在标定传声器阵元坐标时产生较大误差的问题,提出了利用脉冲声源作为标定声源,并且截取脉冲源直达声的方法来抑制混响声场的影响,提高传声器阵元坐标标定的精度。建立了阵元坐标标定的误差分析模型,并以白噪声和脉冲声源作为标定声源进行数据仿真和对比分析。仿真结果表明,使用脉冲声源作为标定声源能有效地抑制混响声场的影响,获得传声器阵列阵元的准确坐标。同时,在封闭的房间内建立起孔径为3.5 m、64阵元的螺旋状吸顶传声器阵列进行了实验研究,实验结果验证了本文提出方法的有效性。
A calibration method of array element coordinates of ceiling microphone array is proposed. In the reverberant sound field, the performance of the delay estimation algorithm is seriously degraded, which leads to a large error in the calibration of the microphone array element coordinates. A method of using the pulse sound source as the calibration sound source and intercepting the direct sound of the pulse source Suppress the influence of reverberant sound field and improve the accuracy of microphone array coordinate calibration. The error analysis model of coordinate calibration of the array element was established. The data of white noise and pulse sound source were calibrated and compared. The simulation results show that the use of pulse sound source as a calibration sound source can effectively restrain the influence of the reverberant sound field and obtain the accurate coordinates of microphone array elements. At the same time, a helical ceiling microphone array with aperture of 3.5 m and 64 array was established in a closed room. The experimental results verify the effectiveness of the proposed method.