代码:
%% ------------------------------------------------------------------------ %% Output Info about this m-file fprintf(‘\n***********************************************************\n‘); fprintf(‘ <DSP using MATLAB> Problem 2.14 \n\n‘); banner(); %% ------------------------------------------------------------------------ n1 = [-10:30]; x1 = cos(pi*n1/4) .* (stepseq(-5, -10, 30)-stepseq(25, -10, 30)); n2 = [-10:30]; x2 = (0.9 .^ (-n2)) .* (stepseq(0, -10, 30) - stepseq(20, -10, 30)); n3 = [-10:10]; x3 = round( 5 * (-1+2*rand(21,1))); [x4, n4] = impseq(2, -10, 30); figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(4,1,1); stem(n1, x1); title(‘x1=cos(\pin/4)[u(n+5)-u(n-25)] sequence‘); xlabel(‘n1‘); ylabel(‘x(n)‘) ; grid on subplot(4,1,2); stem(n2, x2); title(‘x2=(10/9)^n[u(n)-u(n-20)] sequence‘); xlabel(‘n2‘); ylabel(‘x2(n2)‘); grid on; subplot(4,1,3); stem(n3, x3); title(‘x3=round(5w(n)) sequence‘); xlabel(‘n3‘); ylabel(‘x3(n3)‘); grid on; subplot(4,1,4); stem(n4, x4); title(‘x4=\delta(n-2) sequence‘); xlabel(‘n4‘); ylabel(‘x4(n4)‘); grid on; %% ------------------------------------------ %% Commutation %% ------------------------------------------ [y1, ny1] = conv_m(x1, n1, x2, n2); [y2, ny2] = conv_m(x2, n2, x1, n1); figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Commutation‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny1, y1); title(‘x1*x2 sequence‘); xlabel(‘ny1‘); ylabel(‘y1(n)‘) ; grid on subplot(2,1,2); stem(ny2, y2); title(‘x2*x1 sequence‘); xlabel(‘ny2‘); ylabel(‘y2(n)‘); grid on; %% ----------------------------------------------- %% Association %% ----------------------------------------------- [y1, ny1] = conv_m(x1, n1, x2, n2); [y2, ny2] = conv_m(y1, ny1, x3, n3); [y3, ny3] = conv_m(x2, n2, x3, n3); [y4, ny4] = conv_m(y3, ny3, x1, n1); figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Association‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny2, y2); title(‘(x1*x2)*x3 sequence‘); xlabel(‘ny2‘); ylabel(‘y2(n)‘) ; grid on subplot(2,1,2); stem(ny4, y4); title(‘x1*(x2*x3) sequence‘); xlabel(‘ny4‘); ylabel(‘y4(n)‘); grid on; %% ------------------------------------------------ %% Distribution %% ------------------------------------------------ [y1, ny1] = sigadd(x2, n2, x3, n3); [y2, ny2] = conv_m(x1, n1, y1, ny1); [y3, ny3] = conv_m(x1, n1, x2, n2); [y4, ny4] = conv_m(x1, n1, x3, n3); [y5, ny5] = sigadd(y3, ny3, y4, ny4); figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Distribution‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny2, y2); title(‘x1*[x2+x3] sequence‘); xlabel(‘ny2‘); ylabel(‘y2(n)‘) ; grid on subplot(2,1,2); stem(ny5, y5); title(‘x1*x2+x1*x3 sequence‘); xlabel(‘ny5‘); ylabel(‘y5(n)‘); grid on; %% ------------------------------------------------------------- %% Identity %% ------------------------------------------------------------- [y1, ny1] = conv_m(x1, n1, x4, n4); [y2, ny2] = sigshift(x1, n1, 2); [y3, ny3] = conv_m(x2, n2, x4, n4); [y4, ny4] = sigshift(x2, n2, 2); [y5, ny5] = conv_m(x3, n3, x4, n4); [y6, ny6] = sigshift(x3, n3, 2); figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Identity1‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny1, y1); title(‘x1*\delta(n-n0) n0=2 sequence‘); xlabel(‘ny1‘); ylabel(‘y1(n)‘) ; grid on subplot(2,1,2); stem(ny2, y2); title(‘x1(n-n0) sequence‘); xlabel(‘ny2‘); ylabel(‘y2(n)‘); grid on; figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Identity2‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny3, y3); title(‘x2*\delta(n-n0) n0=2 sequence‘); xlabel(‘ny3‘); ylabel(‘y3(n)‘) ; grid on subplot(2,1,2); stem(ny4, y4); title(‘x2(n-n0) sequence‘); xlabel(‘ny4‘); ylabel(‘y4(n)‘); grid on; figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Problem 2.14 Identity3‘) set(gcf,‘Color‘,[1,1,1]) % 改变坐标外围背景颜色 subplot(2,1,1); stem(ny5, y5); title(‘x3*\delta(n-n0) n0=2 sequence‘); xlabel(‘ny5‘); ylabel(‘y5(n)‘) ; grid on subplot(2,1,2); stem(ny6, y6); title(‘x3(n-n0) sequence‘); xlabel(‘ny6‘); ylabel(‘y6(n)‘); grid on;
运行结果:
时间: 2024-10-03 23:17:39