在信号处理中，很多时候都会遇到端点问题，端点处总是特殊的，这是一种认为相似的波形会在信号中多次出现的基础上编写的延拓端点的程序-In signal processing, will often encounter problems endpoint, the endpoint is always special, which is a similar wave that appears multiple times in the signal on the basis of written procedures for the endpoint extension