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脉搏波中包含着人体心血管系统的生理和病理信息,已有的脉搏波检测设备对心血管疾病的临床诊断与治疗有很大帮助。为实现对脉搏波检测设备性能指标的测试,需要获得准确的波形;然而,现有的信号发生器不能提供精确对应多种生理、病理状态的脉搏波输入信号。本文基于弹性腔理论设计了一种脉搏波发生器,对心血管系统进行建模,得到四种不同阻力条件下波形输出,同时添加噪声选择、设置信噪比(SNR)等功能。由于需要系统具有便携、动态响应好、可扩展性强、低功耗等特点,所以本文采用了现场可编程门阵列(FPGA)作为硬件开发平台,在可编程片上系统(SOPC)开发流程下,完成了脉搏波生成算法设计、外围存储器及用户接口控制。通过液晶屏和触摸屏,用户可通过输入关键参数设定想要的脉搏波,在液晶屏上显示波形,同时输出低电压电压模拟信号。本文设计的脉搏波发生器结构简单,为脉搏波的教学与科研以及采集与诊断设备的检测提供了解决方案。
The pulse wave contains the physiological and pathological information of the human cardiovascular system. The existing pulse wave detection equipment is of great help in the clinical diagnosis and treatment of cardiovascular diseases. However, the existing signal generators can not provide pulse wave input signals corresponding precisely to a variety of physiological and pathological conditions. In this paper, a pulse wave generator is designed based on the elastic cavity theory. The cardiovascular system is modeled, and the waveform output is obtained under four different resistance conditions. At the same time, noise selection and SNR setting function are set. Because of the need of the system is portable, good dynamic response, scalability, low power consumption and other characteristics, this article uses a field programmable gate array (FPGA) as a hardware development platform, programmable system on chip (SOPC) development process, Completed the pulse wave generation algorithm design, peripheral memory and user interface control. Through the LCD screen and touch screen, users can enter the key parameters to set the desired pulse wave, the waveform displayed on the LCD screen, while the output low-voltage voltage analog signals. The pulse generator designed in this paper has a simple structure and provides a solution for the teaching and research of pulse waves and the detection of the acquisition and diagnosis equipment.