Design of a multichannel biomedical signal acquisition system based on Cortex-M4 processor

A multichannel biomedical signal acquisition system based on core processor STM32F405 of the Cortex-M4 is presented in this paper. The paper describes the system mainly from the perspective of hardware and software design. The hardware design includes three major parts - the power conversion circuit, the signal acquisition circuit and the signal processing circuit. For the software module, data collection and transmission, and design of digital filters are of the research focus. It is demonstrated in experimental tests that the system can extract and collect a variety of human physiological signals in complex environments. In addition, data transmission between the system and PC is supported by Ethernet, which enables remote monitoring of biomedical signals of humans.