Chap1. 1.4 1212122121122121222y11102y0.5111y0.51.513y013013y0.51110.51.513tttttxtxtxxtdxxtxxtdtdtttxxtdtdtttttorttorttttttt 1.8 0000000001200220022002cossin222cos0,1,2,2sin0,1,2,nnnTTTnTTnTax tantbntax t dtTax tnt dtnTbx tnt dtnT傅立叶级数公式 1002212201c o sc o sc o s1c o s141c o s1c o s15.0202020 ( a )nnntnnntnnntxnnbnnaaTttTtTtx代 入 公 式 得 : 10022222012212c o s1c o sc o s11411c o s115.0c o s2( b )nnnTjntnntnnntxnbnnaannXenXTtxtx得到:根据时移性质: 1022322020201003coscos1221cos12cos41cos2 (c)nTnnntnnntxnndttntxTaatnaatx偶对称, 1 .1 2 dtetxjXtj频谱密度函数: 000222si n02si n4102si n412si n42121001-010011-011 (1)2122212212222212212221211 FFTSaFjtxFFFjdttxdFFeedttxdFFtttdttxdtttdttdxttttttxjwjw其中: ...