Dear all: This question includes Up-sampler and WSS concept..may I have any idea from you? Thanx :-) Question: Let x[n] be a WSS process with auto-correlation function R[m]. Then x[n] goes into a up-sampler with coefficient L to get an output y[n]. Finally, y[n] goes into a FIR filter to get an output z[n]. Determine whether the random process z[n] also WSS? -- = [Origin] 中興電機 拿鐵屋 bbs.ee.nchu.edu.tw = [Author] huhu post from cpe-72-227-52-99.stny.res.rr.com