一种新型肌电诱发电位仪的研制

Development of New Muscle Electricity Level Inducing Apparatus

介绍一种基于USB2.0通讯接口的肌电诱发电位仪。该仪器由数据采集卡和PC机组成,与同类电位仪不同,其采集卡为外置式,具有使用灵活、工艺容易实现等优点。在采集卡中采用CY7C8013片内带USB收发器的CPU作为主控器,简化了硬件设计;采集通道选择CPLD控制4片A/D转换器,实现了四个通道无延迟同步采样。PC机中对获得的生理信号采用"信号叠加平均法",使随机噪声相互抵消,滤波效果明显。

A muscle electric inducing apparatus on the basis of USB2.0 was introduced. This apparatus was made of data collecting card and PC, different from similar electric inducing apparatus. The new apparatus was characterized by collecting card type put outside, flexible in use and easy to complete its process. Adoption of CY7C8013 with USB transceiver CPU as main controller, simplifies hardware design in the slice among gathering card; the collecting way chooses CPLD to control 4 blocks of A/D converters without delayed sampling in step after realizing four passways. The software adopts 'the signal superposed average law' for the physiological signal that is obtained in the PC to make the random noise offset each other, and the wave filted result obvious.