用于心理活动评估的多体征参数无线传输系统

Research on wireless transmission system of multi-parameter signs

目的设计一种用于心理状态评估的多参数生命体征信号无线传输方案。方法采用C8051F350片上系统，在应用层定义数据帧结构，包括通道号、控制字和数据等信息，实现各节点数据分通道有序进入上位机缓存区；在缓存区采用5sl格、1格至少48组数据的传输速率，既匹配上位机图像的动态显示，又实现各通道采集信号的稳定有序传输。结果系统经过工作实验验证，当通信距离稳定在10～15m时，上位机动态显示平滑曲线及数据，符合系统设计需求，并且数据帧优化后的发送功率能够降低到普通模式的1／12。整个系统体积小，功耗低，便于携带。结论本研究的多体征参数无线传输系统消除了与受试者相连的数据线，不影响其正常活动，有利于真实地反映受试者的心理状态，可为心理评估提供了一种可靠的检测手段。

Objective To design a wireless transmission solution of multi-parameter vital signs signal which can be applied in psychological status assessment. Methods C8051F350 SOC was used to define data frame structure, on application level, including channel number, control words, data and so on, which put all nodes data into the upper computer cache area by channel in an orderly way. A transfer rate of five seconds on a grid, each grid at least 48 groups of data was chosen in buffer, which could not only match the dynamic PC image display, but also to achieve the stability of the channel signal acquisition and orderly transfer. Results After operating test,with the communication distance within 10-15 m,the dynamical display of the upper computer showed a smooth curve data, which met the system design requirement. After optimization of the data frame,the transmission power could be reduced to 1/12 of that of normal mode.The whole system with three advantages of small size, low power and easy to carry. Conclusion Multi-parameter wireless acquisition system described in this paper eliminates the data line connected to the subjects, which does not affect their normal activities and is conducive to the real response of subjects＇ mental state, and provides a reliable means of detection for psychological assessment.