基于低通滤波下A计权的噪声监测系统的实现  

Realization of A⁃weighted noise monitoring system based on low pass filtering

作　　者：黄智轩 许志浩 康兵 汪大兴 蒋善旗 HUANG Zhixuan;XU Zhihao;KANG Bing;WANG Daxing;JIANG Shanqi(Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院,江西南昌330099

出　　处：《电子设计工程》2024年第16期12-16,共5页Electronic Design Engineering

基　　金：江西省教育厅科技项目(GJJ211943)。

摘　　要：随着国内经济发展、城市用电量增加,城区变电站数目逐步递增,变电站发出的噪声将给附近居民带来许多不利影响。针对一般的噪声问题,常用A计权进行评判。经研究,通过采用巴特沃斯IIR数字滤波器下的低通滤波处理算法,可大大提高A计权下声压级计算的精确度。将上述算法部署在噪声在线监测装置内部,通过该装置采集变电站附近的音频数据。测试结果表明,采集装置可有效滤除音频噪声干扰,对实时获取的音频数据进行A计权下的声压级计算,计算结果准确率可达95%。With the development of domestic economy and the increase of urban power consumption,the number of substations in urban areas is gradually increasing.The noise from substations will bring many adverse effects to nearby residents.For general noise problems,A⁃weighting is often used for evaluation.Through research,the accuracy of sound pressure level calculation under A⁃weighting can be greatly improved by using the low pass filtering processing algorithm under Butterworth IIR digital filter.The above algorithm is deployed in the online noise monitoring device to collect audio data near the substation.The test results show that the acquisition device can effectively filter out the audio noise interference,and calculate the sound pressure level of the real⁃time acquired audio data under A⁃weighting,and the accuracy of the calculation results can reach 95%.

关 键 词：变电站噪声 A计权 低通滤波 数字滤波器 噪声监测 

分 类 号：TN0[电子电信—物理电子学]