支付宝的声波支付(当面付)是什么原理? - 知乎

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前两位为信息头,采用“hj”,用以通知接收端开始接收。中间10位为有效的信息位,是有效的传输信息,即Key值经过映射后的频率信息。最后8位为RS(Reed-Solomon)校验位,通过RS校验算法,对中间10位进行计算,生成8位的校验信息。。如下图:


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