一种植入式神经控制信号传输的数据编码方法

A Data Coding Method for Transmitting Implantable Neural Control Signals

采用差分编码的方式将神经控制信号传送至植入式神经信号获取系统的体内模块时,需要体内、体外模块的时钟高度同步,这使得电路的设计非常困难.文中提出了一种新的数据编码传送方法——在体外模块用脉宽调制的方法将需要传送的数据进行编码,通过二进制相移键控(BPSK)调制和解调方式传送到体内模块后,使用时钟检测器、时钟分频器、脉冲宽度计数器以及脉冲逻辑判决器进行解码,这样体内模块和体外模块可以工作在不同时钟频率,使得电路的设计和验证大为简化.该方法已经成功应用于无线植入式神经信号获取系统的板级电路中,波形测试的结果显示了该方法的可行性.经过M序列发生器所产生的1MB随机数据的传输测试未发现有误码产生,表明所设计的编解码方式具有较高的可靠性.

In the transmission of neural control signals to the internal module of a implantable neural-signal acquisition system using the differential coding method,high clock synchronization between the internal and the external systems is required,which makes the circuit design extremely difficult.In order to solve this problem,a new data coding method is presented.In the external module,control signals coded by pulse-width modulation are transmitted to the internal module through binary phase shift keying（BPSK）modulation and demodulation, and the clock detector, clock divider, pulse width counter and pulse logic judger are used to decode the signals. Thus, both the internal and the external modules can work at asynchronous system clock frequencies, and the circuit design and verification are greatly simplified. The new coding method has been successfully applied to a board circuit system for wireless implantable neural-signal acquisition, and the waveform test results verify the feasibility of the method. Moreover, no error has been found in the transmission test of 1 000 000 B random data produced by a M-sequence generator, thus coming to the conclusion that the proposed coding method is highly reliable.