将声音文件在时间轴上分割成几段，分别将段的秩序及某些段内的秩序颠倒，从而实现了对声音文件的加密。首先，先读取一个声音信号，对信号做1024点FFT变换，取完点之后，分成四个向量，四个向量组成一个矩阵，再对每一个向量进行转置，再重新整合，从而就实现了回密的过程。-Sound files on the timeline will be divided into paragraphs, each paragraph of the order and reversed the order of some

四轴飞行器控制端，需配置crazyflies的客户端软硬件-Four aircraft control terminal, configure client software and hardware crazyflies

固高科技GT系列运动控制卡DEMO控制程序，最多可控制四个轴-Googoltech GT series motion control card DEMO control procedures, can control up to four axes

华科电子设计大赛的，，四轴无人机源代码-China Electronics Design Contest ,, axis UAV source code! ! !