Wireless multi-node physiological signal monitoring system based on low-power-consumption Bluetooth
A low-power bluetooth, physiological signal technology, applied in wireless communication, time division multiplexing systems, services based on specific environments, etc., can solve the problem that the absolute clock cannot be implemented, and the starting point synchronization of multi-node physiological data of mobile phone nodes has not been found. and other problems to achieve the effect of small overhead and maintaining data synchronization
Inactive Publication Date: 2019-07-30
NANJING UNIV
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The disadvantage of this solution is: in the context of low-power Bluetooth applications, in order to ensure the realization of low power consumption or ultra-low power consumption, maintaining an absolute clock cannot be implemented on such nodes
[0012] In short, in the context of Bluetooth low energy consumption, no good solution has been found for the cooperation of mobile phone nodes and wireless measurement nodes to realize the synchronization of the starting point of multi-node physiological data
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[0045] According to the technical scheme of the present invention, according to the attached figure 1 Structural block diagram, designed the physiological signal acquisition module side of three nodes, the smartphone platform adopts the Android system; the low-power Bluetooth wireless microcontroller of the module side uses TI's CC2640R2F, each module includes an analog front-end, a wireless micro-controller device and power supply.
[0046] Taking the application scenario of EEG, ECG, and respiratory signals as an example, the sampling rate is set to 500Hz, including 16 channels of EEG, 4 channels of ECG and a single channel of respiratory signals. Each sampling value is quantized by 3 bytes, and each The packet also includes a 4-byte sample value count, and the packet payload structure for each signal is shown in the attached Figure 7 As shown, in the case of one-to-many, the EEG node places 5 sampling data per packet, the ECG node places 10 sampling data per packet, and ...
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The invention discloses a wireless multi-node physiological signal monitoring system based on low-power-consumption Bluetooth. The system is composed of a plurality of physiological signal measurementnodes and a smart phone routing node. Transmission is carried out between each measurement node and the mobile phone node based on a low-power-consumption Bluetooth protocol. The system is characterized in that starting point synchronization among measurement data of each measurement node adopts the following method: (1) sequentially sending a synchronous trigger packet to each measurement node by a mobile phone, and the synchronous trigger packet carrying a timestamp of the current sending moment of the mobile phone and a timestamp field of the synchronous trigger moment of each node; (2) calculating the time difference of two timestamps in the received synchronous triggering packet by each measuring node, and taking the nearest sampling point as an initial uploading sampling point, namely an initial data starting point when the synchronous triggering moment arrives; and (3) adding the counting of the sampling values of the packet data into each uploaded packet of data. The scheme ofthe system can ensure synchronization of data starting points of all measurement nodes on a time axis.
Description
technical field [0001] The invention relates to a wireless multi-node physiological signal monitoring system based on low-power bluetooth. [0002] When there are many types of physiological signals monitored or a large number of measuring points, it is necessary for the physiological signal monitoring system to adopt the mode of wireless communication with multiple measurement nodes. Quantity, so as to ensure the recording quality of the measured physiological signals and the comfort of the human body during monitoring. The function of each measurement node includes the conditioning of physiological signals, AD and functions as a terminal for wireless communication. [0003] Due to the popularity and powerful functions of smart phones, such a multi-node wireless physiological signal monitoring system often uses the mobile phone as a routing node. On the one hand, it communicates with other measurement nodes and collects the physiological signal data detected by each node in ...
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IPC IPC(8): H04W56/00H04J3/06H04W4/38H04W4/80
CPCH04W56/001H04W56/007H04J3/0664H04W4/80H04W4/38H04Q2209/845H04Q2209/43Y02D30/70
Inventor 刘红星许利特司峻峰
Owner NANJING UNIV