云测试网络中数字噪声探头技术研究

Research on digital video noise probe in cloud web

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。

Cloud web of audio noise detection provides the local polluted information and sends the noise values and their distribution to sever of 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 digit- al probe and is one of the major techniques. This paper describes a DSP5509 based digital noise measurement research n detail, in which IIR filter is developed to make A weighting or C weighting filter. Zigbee protocol WSN inter- face is embedded to realize information interconnection. Experiments show the probe can timely detect the audio noise signal within 20 Hz - 20 kHz in frequency and 40 dB - 100 dB in dynamic amplitude. Absolute error is controlled less than ±1 dB.