123,---ABCDEA.()(ttf(t))f(n)f(nTs)f(t)f(nTs)f(n)TsTsnnt=nTs1/Tsf(nTs)f(t)t=t0n=n0t< t0n< n0: t0=0n0=0t< t0n< n0第 1 页,共 65 页
B.T>0f(t)f(n)TrNN:1-1Nf(t)f(n)r1-2x(t),y(t)T1/T2[0-T]0~N-1T1;T2T1/T2T1x(t)+y(t)T2:1:2:3=m1:m2:m3T=2*mi/i1sin2tcos3tT1/T2=3/22=f1(t)T1= 2/1=s1=2 rad/s3rad/sT2= 2/2=(2/3) sT1T22C.(f(t)(-,)(-,)f(t)f(t)((0 D.t,1.(T),:r(t)=Asin(?t+)2.*f(t)1.-Addition()Multiplication(())*FT1-12.0ttimeshiftingt tf(t)f1(t)f2(t)tt t-1b1t-1+b11+bt-1-b1-b ttt tbb3.1(reflection)2Timescaling:f(t)f(t)a<0,1-201t-11102t01t0-202 t|a|>1|a|<11-2P9-10f(t)f(t)1/|a||a|第 3 页,共 65 页
2021年河海大学863信号与系统考研精品资料之管致中《信号与线性系统》考研辅导课件
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