麦克风阵列安装偏差引起的旋转声源定位误差

对旋转声源定位中3种常见阵列安装偏差即角度偏差、x轴向偏移偏差、z轴向偏移偏差导致的定位误差进行了详细研究。结果表明:当角度偏差在-10°～10°范围内,声源定位位置误差随角度偏差呈近似线性变化,最大定位位置误差为0.089 m,定位强度误差呈随机变化,其中最小定位强度误差为0.97 dB,最大为4.69 dB;当x轴向偏移偏差在-0.1～0.1 m范围内,声源定位位置误差随x轴向偏移偏差呈近似线性变化,最大定位位置误差为0.098 m,定位强度误差呈随机变化,其中最小定位强度误差为0.91 dB,最大为4.94 dB;当z轴向偏移偏差在-0.1～0.1 m范围内,最大定位位置误差为0.01 m,正偏移偏差引起的定位强度误差总体小于负偏移偏差,其中最小定位强度误差为0.81 dB,最大为4.51 dB。研究结果可为麦克风阵列在实际应用中控制测量误差提供指导。 

Error in rotating sound source localization caused by installation deviation of microphone array

The localization error caused by three types of common array installation deviation, namely angular deviation, x-axis offset deviation and z-axis offset deviation was studied in detail in the rotating sound source localization. Research showed that when angular deviation was within the range from -10° to 10°, the position error varied approximately linearly with the angular deviation, the maximum positioning error was 0.089 m, the strength error was randomly distributed, the minimum strength error was 0.97 dB and the maximum strength error was 4.69 dB; when x-axis offset deviation was within the range from -0.1 m to 0.1 m, the position error varied approximately linearly with x-axis offset deviation, the maximum positioning error was 0.098 m, the strength error was randomly distributed, the minimum strength error was 0.91 dB and the maximum strength errors was 4.94 dB; when z-axis offset deviation was within the range from -0.1 m to 0.1 m, the maximum positioning error was 0.01 m, strength error caused by the positive z-axis offset deviation was smaller than the negative z-axis offset deviation generally, the minimum strength error was 0.81 dB and the maximum strength error was 4.51 dB. Research results can provide guidance for controlling the localization error of microphone arrays in practical applications.