日志
hht谱
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如幅值谱为H（A，f，t）,表示为H（fi,ti）,
则边际谱： HB(fi)=sum(H(fi,:)*dt)=sum(H(fi,:))*dt, (dt为采样间隔，等距)
则边际谱： HB(fi)=sum(H(fi,:)*dt)=sum(H(fi,:))*dt, (dt为采样间隔，等距)
参考http://www.chinavib.com/forum/viewthread.php?tid=37688
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