Some Investigations And Implementation For Two Embedded Real-time Systems

This paper did several studies on two specific embedded real-time systems-the fetal ECG embedded real-time system and the real-time online monitoring system of the grinding wheel contacting time point.This paper is divided into five chapters. Firstly, in chapter 2, we investigate the feasibility of applying DSP TMS320C5515 to the two embedded systems. In this section, as an example, we implemented FFT with DSP, which can explain the fact that DSP can work faster and more efficient. The result makes us more confident to apply the DSP in the two future embedded systems. Secondly, in chapter3, to solve the problem of polarization voltage in the pre-circuit of the fetal ECG embedded real-time system and the offset voltage and other low frequency interferences in the pre-circuit of the real-time online monitoring system of the grinding wheel contacting time point, we did the extension of integral feedback based implementing approach to a high pass filter. The result showed that, the proposed high pass filter implementing scheme is feasible and can be easier to achieve better phase frequency characteristics on the pass-band, in comparison with the typical implementing of same order high-pass filter and direct use of the integral feedback without extension.Thirdly, in chapter 4, we gives a complete method of implementing the real-time online monitoring system of the grinding wheel contacting time point. We designed analog circuits and PCB board, wrote the corresponding program code. Further more, we have made a prototype machine. Through testing, the system is stable and reliable, which can monitor the grinding wheel contacting time point real-time and correctly. Finally, the chapter 5 gives the summary of all work in this paper, and prospects some future works.