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    发布日期: 2021-06-01
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.proakis.代码 《数字信号处理matlab版》代码

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% Chapter 02: Example 02.01: Signal Synthesis

%

figure(1); clf

% a) x(n) = 2*delta(n+2) - delta(n-4) -5<=n<=5

n = [-5:5];

x = 2*impseq(-2-55)-impseq(4-55);

subplot(221); stem(nx); title(‘Sequence in Example 2.1a‘)

xlabel(‘n‘); ylabel(‘x(n)‘); axis([-55-23])

%

% b) x(n) = n[u(n)-u(n-10)]+10*exp(-0.3(n-10))(u(n-10)-u(n-20)); 0<=n<=20

n = [0:20];

x1 = n.*(stepseq(0020)-stepseq(10020));

x2 = 10*exp(-0.3*(n-10)).*(stepseq(10020)-stepseq(20020));

x = x1+x2;

subplot(222);stem(nx);

title(‘Sequence in Example 2.1b‘)

xlabel(‘n‘);ylabel(‘x(n)‘);axis([020-111])

%

% c) x(n) = cos(0.04*pi*n) + 0.2*w(n); 0<=n<=50 w(n): Gaussian (01)

n = [0:50];

x = cos(0.04*pi*n)+0.2*randn(size(n));

subplot(223);stem(nx);title(‘Sequence in Example 2.1c‘)

xlabel(‘n‘);ylabel(‘x(n)‘);axis([050-1.41.4])

%

% d) x(n) = {...5432154321...}; -10<=n<=9

n=[-10:9];

x=[54321];

xtilde=x‘ * ones(14);

xtilde=(xtilde(:))‘;

subplot(224);stem(nxtilde);title(‘Sequence in Example 2.1d‘)

xlabel(‘n‘);ylabel(‘xtilde(n)‘);axis([-109-16])

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  1996-09-12 11:20  proakis\
     目录           0  1996-09-06 16:47  proakis\CHAP_02\
     文件        1081  1996-09-06 16:47  proakis\CHAP_02\ex020100.m
     文件         816  1996-09-06 16:47  proakis\CHAP_02\ex020200.m
     文件         465  1996-09-06 16:47  proakis\CHAP_02\ex020300.m
     文件         477  1996-09-06 16:47  proakis\CHAP_02\ex020400.m
     文件         764  1996-09-06 16:47  proakis\CHAP_02\ex020500.m
     文件        1163  1996-09-06 16:47  proakis\CHAP_02\ex020600.m
     文件         223  1996-09-06 16:47  proakis\CHAP_02\ex020700.m
     文件         192  1996-09-06 16:47  proakis\CHAP_02\ex020800.m
     文件        1191  1996-09-06 16:47  proakis\CHAP_02\ex020900.m
     文件         475  1996-09-06 16:47  proakis\CHAP_02\ex021000.m
     文件         328  1996-09-06 16:47  proakis\CHAP_02\ex021100.m
     目录           0  1996-09-06 16:47  proakis\CHAP_03\
     文件         637  1996-09-06 16:47  proakis\CHAP_03\ex030300.m
     文件         839  1996-09-06 16:47  proakis\CHAP_03\ex030400.m
     文件         424  1996-09-06 16:47  proakis\CHAP_03\ex030500.m
     文件         414  1996-09-06 16:47  proakis\CHAP_03\ex030600.m
     文件         454  1996-09-06 16:47  proakis\CHAP_03\ex030700.m
     文件         340  1996-09-06 16:47  proakis\CHAP_03\ex030800.m
     文件         870  1996-09-06 16:47  proakis\CHAP_03\ex030900.m
     文件         429  1996-09-06 16:47  proakis\CHAP_03\ex031000.m
     文件         393  1996-09-06 16:47  proakis\CHAP_03\ex031100.m
     文件        1162  1996-09-06 16:47  proakis\CHAP_03\ex031200.m
     文件         413  1996-09-06 16:47  proakis\CHAP_03\ex031300.m
     文件         254  1996-09-06 16:47  proakis\CHAP_03\ex031500.m
     文件         633  1996-09-06 16:47  proakis\CHAP_03\ex031600.m
     文件         561  1996-09-06 16:47  proakis\CHAP_03\ex031700.m
     文件         593  1996-09-06 16:47  proakis\CHAP_03\ex031800.m
     文件         619  1996-09-06 16:47  proakis\CHAP_03\ex03180a.m
     文件         614  1996-09-06 16:47  proakis\CHAP_03\ex03180b.m
............此处省略171个文件信息

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