1、MATLAB1常见信号的MATLAB表示及运算1、用MATLAB命令函数分别绘出抽样信号、矩形脉冲信号、周期矩形脉冲信号、三角波脉冲信号、三角波周期信号的波形,理解其中参数的意义。t=-20:0.01:20;f10=inc(t);20=repul(t,);f3=qe(,2);f0=tpuls(t,0.5);f0=sawtooth(t,05);suplt(5,1,1);lo(,f10);xis(-1,0,-2,);spo(,1,2);lot(t,f20);xis(-10,0,-2,2);sbplot(5,1,3);plot(t,f30);ais(1,0,-,2);ubplo(,4);pot(t,
2、f4);as(-0,1,-2,2);subplo(5,1,5);plot(,f50);xis(-1,10,-2,2);t-20:0.01:20;f2=ectpul(,2);f21=rtpus(t,4);22=rectpus(t,8);3=repuls(,1);f24=ectpuls(,32);sublot(5,1,1);plot(t,0);xis(-10,10,2,);uplot(,1,2);lot(,f1);axis(1,10,-2,2);sbpl(5,1,3);po(t,22);xis(-0,10,-,2);ub(5,1,4);pot(t,f23);ai(-10,10,-,);subplt
3、(5,1,5);lot(t,4);axis(-8,8,2,2);=5/i;t-2:0.001:2;3=qare(t,4p);1=square(t,*pi);3=squr(t,16*pi);f33=square(mt,25);f34=squre(m*t,50);subplot(5,1,);ot(t,f3);is(-10,1,-2,);subpo(5,1,2);po(t,f3);axis(-10,10,-2,2);sup(5,1,3);plt(t,f32);ax(-10,10,-2,);bplot(5,1,4);po(t,);axs(-0,10,-,2);splot(5,1,);plot(t,f3
4、4);xis(-0,0,2,2);t0:0.:0;f40=tripul(t,2);f41=tripuls(t,4);f42=rips(t,8);43=ripls(t,16);f44=triuls(t,3);subpl(5,1,);plot(t,f40);axis(-10,0,2,2);subpot(,1,2);pot(t,f41);ais(-1,10,-2,2);subplot(,1,3);plot(t,f2);xis(-10,0,-2,);uplot(,1,);plot(t,f43);ais(-10,10,,2);ulot(5,1,5);plot(t,f44);axi(-1,8,-,2);=
5、5/pi;t-20:0.01:2;f5=swtot(t,0.25);f5=sawoth(t,.);f2=awtot(t,05);f3=swtooth(m*t,.);f5=sawtooth(t,0.7);subplot(5,1,1);plot(t,50);xis(-10,0,-2,2);sbpot(5,1,2);plt(,f);xis(-10,1,2,2);ubpot(5,1,3);plot(t,f52);axis(-10,-2,2);sublot(5,1,4);plt(t,5);is(10,10,-,2);sbl(5,1,5);plo(t,f4);axs(-1,1,-2,2);2、分别用MAA
6、B的数值运算和符号运算功能,绘出下列连续时间信号的波形。sys t;=sym(2x(2t)eaisde(t);ezplot(f,,10);=-1:0.0:0; 1=-1:0.1:-001;2=0:.0:10; f=ers(,lenth(1),ones(1,length(t2); f=(cos(it/2)*f1;lot(t,f) axis(-,10,0,21)s;f=sym(o(pi*t2)(haside(t)haviside(t4)));ezplot(f,,0);t=-:01:10;f=epfun(t,)-stefun(t,4);=(os(pi/2)*;pot(t,f)ais(,10,11,1
7、.);sm t;f=sym(exp()*os(t)*hasie(t));zpl(,-2,10);t=-2:.:10;f1ten(t,0);f(e(t).*os(t)*f1;plo(t,f)is(-2,1,70,11);sm t;f=sym(2/3*heiide(+2);zplo(f,-10,10);t-0:0001:10;f=steu(,-);f=2/.*tf1;pt(,f);ais(-10,1,-2,);3、已知信号的波形如右图所示,绘出满足下列要求的信号波形。ymst ;f=sm(2eviside(t)heavisde(t-1)-heviside(t2);fsbs(,t,t);subpt(
8、2,1,1);ezl(f,-,3);subplot(2,1,2);ezplot(f1,-3,3);yms t y;f=sy(2*hesde(t)-heaviside(t-)-aisde(t-2);f=bs(f,t,-2);ubplot(,1,);ezplot(,-3,);ubplo(2,1,);ezpt(1,3,6);3syms y;f=sm(2eaviside(t)-eavisie(-)-heavid(t-2));fsubs(,,0.5t);f2=subs(,t,2*t);subpo(3,1);ezlot(f,-3,6);tte((t);subplot(3,1,);zplot(f1,-3,6
9、);titl(f(0.5t));subplot(3,1,3);zplot(f2,-3,6);tile(f(2t);4sym t y;=(2*haiie(t)-heviside(t)-heaisie(-2);f=sbs(f,t,(0.5*t)+1);ublo(2,1,);zplot(f,-,3);tite(f(t));ubpt(2,1,2);ezpl(f1,-3,);tie(f(051);4、利用MAT画出复信号的实部、虚部、模和辅角。clear1:0.01:0;f=*exp(j*(+pi/4);t_real=ea(f);timag=imag(f);_ane =abs(f);tagle = angle(f); suplot(2,2,1);plot(,t_ra);ite(rl);rid on;suplo(2,2,2);plo(t,t_mag)ttl(mag);gri on;subpot(2,2,3);pt(t,t_rage);title(rng);grid on;subplot(2,2,4);plt(,tale);til(nge);gi on;
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