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为了精确拟合人耳的听觉特性,针对环境噪声监测中A计权声级核心算法进行改进,提出了以对数函数加三角函数的多项式数学描述关系式。通过在Lab VIEW平台上进行曲线拟合及计算机仿真实验,对多项式中待定系数及初相角实现了参数优化,对于40phon等响曲线实现了高精度拟合,其拟合绝对误差小于0.15d B,并且针对不同响度的等响曲线找到了相同的变化规律。虚拟仪器技术的应用使得A计权声级核心算法实现变得简便易行。
In order to accurately fit the auditory characteristics of the human ear, aiming at the improvement of A-weighted sound level core algorithm in environmental noise monitoring, a polynomial mathematical description relation based on logarithmic function and trigonometric function is proposed. Through the curve fitting and computer simulation experiments on Lab VIEW platform, the parameters of the polynomial to be determined and the initial phase angle are optimized, and the fitting accuracy of the 40 phon equal-loud curve is achieved with the fitting error less than 0.15d B , And the same change rule is found for the equal loudness curve of different loudness. The application of virtual instrument technology makes A-weighted sound level core algorithm becomes easy and convenient.