摘要
为了提高电声测仪试参数测量的精确度,针对电声测试仪校准设计了一款基于DDS芯片的精密信号源。该信号发生器采用直接数字合成技术,包括STM32最小系统、DDS芯片系统、带通滤波器模块以及数字电位器。利用STM32控制滤波器模块对于DDS模块产生信号的谐波成分和噪声进行滤除,实现高精度的正弦波信号的产生,以便于电声测试仪系统测量精度的提高。通过对数字电位器的控制,实现了电声测试仪对于信号不同幅值的需求。
In order to improve the accuracy of the electro-acoustic test parameters measurement,a precision signal source based on DDS chip was designed for the electroacoustic tester calibration.The signal generator uses direct digital synthesis technology,including the STM32 minimum system,DDS chip system,bandpass filter module and digital potentiometer.The STM32 control filter module is used to filter the harmonic components and noise generated by the DDS module to achieve high-precision sine wave signal generation,so as to improve the measurement accuracy of the electroacoustic tester system.Through the control of the digital potentiometer,the requirements of the electroacoustic tester for different amplitudes of the signal are realized.
作者
周静雷
尹晓东
冯源
Zhou Jinglei;Yin Xiaodong;Feng Yuan(School of Electronic Information,Xi′an Polytechnic University,Xi′an 710048,China)
出处
《电子技术应用》
2019年第11期104-107,116,共5页
Application of Electronic Technique
关键词
精密信号源
电声测试仪
DDS
带通滤波器
数字电位器
precision signal source
electroacoustic testing
DDS
bandpass filter
digital potentiometer
