fiberfibre光纤,纤维 emerge[i'm:d]ⅵ.出现,形成,浮现 emergence[i'm:3ns]n.浮现,出现 haul[h:1jvt.用力托;n.拖,拉,拖运的距离 long-haul长运距的,长途的 trunk[tr∧k]n.干线,中继线,中继线路,局内线 dominate[' d om i ne i t]vt.支配,统治;处于支配地位
The lowpass filter H(u) has a cutoff frequency wc=205T rad/ sec. Thus, c(t)is r(t) where all terms with frequency above we are removed by the lowpass filter. The terms which are kept have kwol 205T rad /sec k|< 10.25, so the output, ac(t),is r(t)= To obtain n, we sample c(t) every T=5 10-3 seconds with an impulse train The sampling frequency is 400T=2 x maximum frequency in c(t). Therefore