双重插值法噪声频谱计权计算及其误差分析

Double interpolation for the calculation of noise frequency weight and its error analysis

为实现对采集到的噪声信号进行声压级计算,提出了一种新的基于样条插值法的频谱计权算法。与传统频谱计权方法比较,该方法计算精度高,且便于计算机实现。误差分析结果显示,用该方法进行A计权噪声频谱计权计算的绝对误差总和小于0.0843dB,相对误差总和小于1.25%,最大相对误差小于0.436%。

In order to calculate the sound pressure level of noise signal, a new arithmetic of noise frequency weight, which is based on spline interpolation, is presented in this paper. It has higher precision and is easy to be realized by computer while compared with traditional means of frequency domain weighting. The error analysis results for A weighted noise frequency weight indicate that the sum of absolute error is less than 0.084 3 dB, the sum of relative error is less than 1.25%, and the maximum relative error is less than 0.436%.