With the development of science and technology, industry automation, people more and more concern with the mutual influence question between human and working environment. How to thorough accurately assess the impact of environmental factors on the staffs, has now become one of the main topics studies. Heart rate variability (HRV) is containing massive information of the cardiovascular nerve and the body fluid adjustment. In recent years, the heart rate variability analysis is a research hot spot on the heart electrical signal processing domain. It has the vital clinical significance for the not-created examination of correlation disease. For 30 years, along with the improvement of instrumentation equipment software and hardware and the clinical widespread application, the domestic and foreign scholars more and more value the HRV monitor. With the thought “the software is the instrument”, this article has designed the human heart rate variability monitor system base on the virtual instrument. The system uses the power function of virtual instrument’s application software, and completes real-time acquisition, the online analysis duty to three continual stage’s heart rate variability signals. The system platform has the strong extendibility and the flexibility. This topic mainly completes the platform’s hardware makeup, and realizes each function of software and hardware. Namely realize heart rate variability signal checking, acquisition, store and analysis. Carry on the time domain analysis and the AR model frequency domain analysis to the heart rate variability, getting the useful nerve information, applied in the cardiovascular disease clinical diagnosis.
During the topic realization, first, introduce and analysis the structure and function, and the significance of virtual instrument (Virtual Instrumentation, VI). On the base of this, study the design and realization method of the system software and hardware. Software’s design and realization becomes the key function. The system hardware uses the technical very mature electronic products, causing the system structure to be simple and high performance. The whole system structure makes up of heart rate variability sensor, data acquisition card, and computer. Then, carry on the time domain analysis, the spectrum analysis and the chaos analysis to the heart rate variability signal. Finally based on the software’s importance in virtual instrument technology, design and realize software each function from the object-oriented method angle. The whole software function includes heart rate variability signal real-time acquisition, the signal saving, signal time domain and frequency domain analysis.
Key words: virtual instrument; data acquisition; heart rate variability; AR model
