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 multi-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 so on, 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.