Design And Implementation Of Embedded Synchronous Sampling And Online Analysis System

The rapid development of computer technology,measurement and control technology,microelectronics technology and digital intelligent technology has made signal acquisition and processing technology widely used in the development of highend analysis and measurement instruments,especially portable products have been rapidly popularized in the military and civilian fields.At the same time,there is a strong demand for real-time processing in the current military and industrial fields.The simultaneous sampling and real-time processing of multiple signals has become a research hotspot in recent years.However,the high-end digital oscilloscope,a typical product that can perform simultaneous and fast processing of multiple signals,is firmly monopolized by Tektronix,Le Croy,Agilent,Fluke and other internationally renowned companies,while China is still in the initial stage of research and development technology.High-end oscilloscopes have high research and development costs and are expensive,which greatly limits their application fields.Based on the technical requirements of the embedded data processing project,this article is based on the AM5708 multi-core processor from the American TI Company,and has completed the embedded synchronous sampling and online analysis system processor module,signal acquisition module,power supply module,control module and data transmission module.Schematic design,PCB drawing and hardware debugging.The software part of the system consists of five parts: signal synchronous sampling,real-time processing,data storage,data display and curve drawing,and data upload.In order to realize the simultaneous sampling and real-time processing of multiple signals,the LINUX and SYS / BIOS operating systems for the ARM and DSP cores in the AM5708 were first set up,respectively.The ARM core-based LINUX operating system mainly completes data upload,human-computer interaction,and interface display tasks.The SYS / BIOS operating system based on the DSP core mainly completes real-time processing tasks such as signal synchronous sampling,signal FFT,wavelet transform,and signal coherent analysis and data storage tasks.With the IPC communication mechanism,real-time interaction between the ARM and DSP cores is achieved,which enables the system to have functions such as simultaneous sampling of multiple signals,signal time-frequency analysis,human-computer interaction,data display,and curves.Finally,in order to verify the effectiveness of the embedded synchronous sampling and online analysis system,a multi-channel sound source localization effect test was performed using this system.By determining the number and spacing of microphones,a five-microphone spatial array topology is proposed in this paper,and the expressions of related variables are derived based on the arrival delay.Tested in a relatively closed test environment,the test results are relatively good.