Some Investigations For High Precision Bioelectricity Acquisition System

High precision bioelectricity acquisition system is the basis of the monitoring and diagnosis of bioelectricity.Existing bioelectricity acquisition system is still to be improved in accuracy.This paper did some investigations for high precision bioelectricity acquisition syste:m.The second chapter of the paper compared and optimized the existing proposals of the front-end analog circuit of a bioelectricity acquisition system.The front-end analog circuit is divided into two parts for discussion,one is the main circuit of the front-end analog circuit and the other is right leg drive circuit.Then we designed some experiments to obtain the optimized proposal and verify that the noise is much more suppressed with it.The third chapter studied digital filtering techniques for processing the collected bioelectrical signals from two aspects.Firstly,we proposed a digital filter to reduce the distortion of acquired bioelectrical signals,called digital compensation;secondly,we applied adaptive filtering algorithms to further improve the SNR of bioelectrical signals.The fourth chapter did some investigations aiming at some problems that may occur during we use the bioelectricity acquisition system.These problems include the electromagnetic interference from the mobile devices,the influence of the idle electrodes,and so on.The fifth chapter summarized the whole paper and raised the outlook for future work.