www.gusucode.com > 调制识别 基于决策论的通信信号调制识别实现matlab源码程序 > moulation classification/classification rate simulink/dif.m
function so=dif(s,fs,Ac) a=diff(s); aa1=fs/2/pi/mean(abs(s))*abs(a); h=[1/4,1/4,1/4,1/4];so=filter(h,1,aa1);