恰逢清明,这几天是清明时节雪纷纷,断崖式降温;又回到了老家,儿时上蹿下跳的核桃树,远去的故乡,远去的时代……

用到的公式:

这里只放前两个小题的计算过程,都比较简单,细心就行。代码如下:

  1. %% ------------------------------------------------------------------------
  2. %% Output Info about this m-file
  3. fprintf('\n***********************************************************\n');
  4. fprintf(' <DSP using MATLAB> Problem 5.1 \n\n');
  5.  
  6. banner();
  7. %% ------------------------------------------------------------------------
  8.  
  9. % ------------------------------------
  10. % x1(n)
  11. % ------------------------------------
  12. xn = [4, 1, -1, 1]; N =4;
  13. Xk_1 = dfs(xn,N)
  14.  
  15. % ------------------------------------
  16. % x2(n)
  17. % ------------------------------------
  18. xn = [2, 0, 0, 0, -1, 0, 0, 0]; N = 8;
  19. Xk_2 = dfs(xn,N)
  20.  
  21. % ------------------------------------
  22. % x3(n)
  23. % ------------------------------------
  24. xn = [1, 0, -1, -1, 0]; N = 5;
  25. Xk_3 = dfs(xn,N)
  26.  
  27. % ------------------------------------
  28. % x4(n)
  29. % ------------------------------------
  30. xn = [0, 0, 2*j, 0, 2*j, 0]; N = 6;
  31. Xk_4 = dfs(xn,N)
  32.  
  33. % ------------------------------------
  34. % x5(n)
  35. % ------------------------------------
  36. xn = [3, 2, 1]; N = 3;
  37. Xk_5 = dfs(xn,N)

  运行结果:

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