使用三阶低通滤波器对方波经行滤波,想使得方波变得平滑一些,可是滤出来结果不满意。总是在高电平到低电平很陡峭,二低电平到高电平却平滑。或是说二阶或是三阶低通滤波器滤出来以后只能是这种效果。求高手指点一二
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