基于虚拟仪器技术的高精度拟合人耳听觉特性A计权算法

A high accuracy A weighted algorithm based on Virtual Instrument Technology

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 precisely fit the human ear auditory characteristics,for environmental noise monitoring in a core algorithm of weighted sound levels to improve proposed to logarithmic function and trigonometric function polynomial mathematical describe relations.Through curve fitting and computer simulation experiments on the platform of Lab VIEW,polynomials in the coefficients of the solution and the initial phase angle of the parameter optimization,for 40 phon equal loudness curve to achieve the high fitting accuracy and fit the absolute error is less than 0.15 d B,and for different loudness loudness curve to find the same variation.The application of virtual instrument technology makes the A weighted sound level core algorithm is easy.