基于ARM7的新型开放式多功能医用信号仪的研制

目的现有的常用信号发生器或生理信号发生器不能同时输出常用信号和模拟生理信号，本文提出一种新型开放式多功能医用信号仪，用于检测各种生理信号，听取不同频率、不同信号的声音及输出常用信号等。方法该仪器以STM32F103RF和高性能集成芯片MAX038为核心。此医用信号仪包括硬件和软件两部分，其中硬件含有ARM7单片机控制单元、按钮组输入单元、数据存储单元等12个单元，软件用C语言编写，并采用keil C进行编译。结果该仪器不仅能输出常用的正弦、方波、三角波、锯齿、矩形信号，还能输出医学中常用的多种生理信号如心电、脉搏波等，且信号波形频率、幅度、类型、波形均采用直观的LCD液晶显示。此外，该仪器具有一个高驱动能力的接口，可直接驱动耳机等，以方便对人耳频率特性和人体阻抗特性的研究和教学。同时，为了便于使用一般示波器能观察各种生理信号，对同一种生理信号可输出不同的频率。结论本仪器使用方便，可广泛应用于科研、教学、测试和仪器维修等。

Development of a Novel Open Multi-Function Instrument Based on ARM7 for Generating Medical Signal

Objective To overcome shortages of available common multi-function physiological signal generators, which can not output the common and physiological signals simultaneously, a novel opening muhi- function generator for physiological signal was introduced in this paper so that we can observe various physiological signals, hear the sound of different frequency or type signals, and obtain common signals. Methods Based on STM32F103RF microcomputer and the high performance signal chip MAX038, this instrument includes two parts, hardware and software. Its hardware, including microcontroller ARM7, keyboard, data memory and soon, was divided into twelve units. And complied by Keil C Vision3, the software was programmed by C language. Results This instrument output not only common types of signals, such as sine, square, triangle and sawtooth signals, but also many kinds of physiological signals such as electrocardiosignal, pulse wave signals. At the same time, the frequency, amplitude, type and waveform of a signal were given by LCD. Especially, an output interface,which may connect to earphone directly, was improved. Therefore, it was convenient to hear sound of different frequencies and kinds of signals, for research on frequency characteristic of human ear and impedance characteristic of human body. In addition, each kind of physiological signal with several various frequencies was availed and might be observed with a normal oscilloscope. Conclusions It was suppose that the instrument might be widely used in research, teaching, examination and maintenance.