云测试网络中数字噪声探头技术研究

云噪声测试网络可检测区域声音污染形态,将噪声值和噪声分布等信息发送至云服务器等处,协助有关部门实现噪声信息化监测。网络的底层,即物理层为噪声监测数字探头,是关键技术之一。文章详细描述了基于DSP 5509数字声级计技术,选用IIR数字滤波器实现噪声的A计权和C计权滤波,嵌入Zigbee无线通讯接口实现信息互联。实验表明,该数字声级计探头能够实时采集监测20 Hz~20 k Hz频域范围、40 d B~100 d B幅值动态范围的噪声信号,误差可控制在±1 d B范围之内。

Research of digital video noise probe in cloud web

Cloud web of audio noisedetection providesthe local polluted information and send thenoise values and their distribution to the sever in cloud web center or other websites. It serves Environmental Protection Authority for noise monitoring in digital and intelligent ways. Bottom layer of the web, namely physical layer, is the noise detection digital probe and is one of the major techniques. The paper describes a DSP5509 based digital noise measurement research, in which IIR filter is developed to make A or C weighting. Zigbee protocol WSN interface is embedded to realize information interconnection. Experiments show the probe can timely detect the audio noise signal within 20~20kHz in frequency and 40~100dB in amplitude. Absolute error is controlled less than ±1dB.