低成本非接触生命参数监测系统研究

his paper describes a high precision non-contact physiological signal acquisition system using oversampling technology, which sacrifices sampling rate for achieving a higher accuracy. As we known, due to low resolution of traditional ADC and high cost if ADC of high resolution is used, oversampling technology is used to achieve a high precision data acquisition in this paper. This technology has been remerged to be studied due to its advantage in the acquisition and analysis of weak life signs by using biomedical wireless sensor networks. In this paper, the traditional sampling and the oversampling technologies were compared by quantifying the parameters of signal-to-noise ratio and dynamic range through simulations and experimental measurements. Oversampling technology reduces the quantization noise about 40dB, in other word, the signal-to-noise increases 40dB, which has great improvement in the resolution of acquisition system for physiological signals.