本程序是用于处理端点效应时的信号延拓方法，次程序是用于前段延拓，对于后端延拓的话直接把原信号进行翻转后再进行延拓，延拓后将信号再翻转回来就行。-This program is a signal extension methods for processing when the end effect, sub-program for front extension, extension to the rear end, then flip directly to the original signal and then carry out extension, the extension will signal the extension then flipped back on the line.