摘要
采用软件可编程增益放大器和单片机控制实现了水声声压信号的数字式测量与监控。利用两级可编程增益放大器AD526芯片级联的方法实现宽动态范围电压信号的量程调整。通过单片机反馈控制系统调整前级放大器的倍数,使电压真有效值测量芯片AD536A工作于最优工作区间。根据当前A/D转换芯片的采样值和前级放大倍数进行运算以实现对声压信号的测量。实验结果表明:该系统电压测量动态范围可以达到68dB,频率响应范围为0～100kHz,能够满足水声信号的测量要求。
A digital measure and observation system is designed utilizing the software programmable gain amplifier and MCU. The two-level cascaded AD526 is used to realize very, wide range adjustment of the voltage signal. The MCU feedback control system can automatically change the gain of the amplifier and make the RMS-to-DC converter AD536 work in its best interval. Current measured value can be computed by the sample value of the A/D converter and amplifier＇s gain. Experiment results show that the system＇s measurement range is up to 68 dB and the frequency respond is 0-100 kHz. The system can meet the acoustics signal measurement demand.
出处
《电声技术》
2009年第2期78-81,88,共5页
Audio Engineering
