• 2022-06-09
    设  [tex=9.0x3.643]sILcJAjxfdVqdm7AUpnuJkrwslwliQBmqUEVyxrhOaobVAIYm/mWxOWAxSaZ1jtufblYVX32Bk+ch2JNez7q570ZJr5YBahfvtHuozCzYn1Nb462YRUcF4I6Vj/UO2Bd[/tex]  是一个基波周期  [tex=3.214x1.286]vWAu8X6pR3k0qPr5hNnyaQ==[/tex]  的周期信号,傅里叶级数系数为  [tex=1.0x1.286]bjRZm1Vy1zu4e3/HqyedUQ==[/tex] , 同时令 [tex=9.071x1.286]oCx0B1yqWlVP1oQM140Z/5wzSJnTdA3KDjtOM62Wm+o=[/tex]  。(a) 证明 [tex=1.643x1.286]yPRFGrW0f4BxwcjiG4WJBA==[/tex]  的基波周期也为 10 ;(b) 求  [tex=1.643x1.286]yPRFGrW0f4BxwcjiG4WJBA==[/tex]  的傅里叶级数系数;(c) 利用  [tex=1.643x1.286]yPRFGrW0f4BxwcjiG4WJBA==[/tex]  的傅里叶级数系数和傅里叶级数一次差分性质求 [tex=4.0x1.286]LCCPh3psQih+MORum9FipiuZ0w2G9skTo4PuFE+h8Wo=[/tex] 。
  • 解(a) 因为 [tex=18.071x1.286]SMWsdTxbOYDodnssWQO0KPLandKvJuk9ATKKOu55VuOvQFNvkGmcC9gPnYpWlgso[/tex], 故[tex=21.643x1.286]oCx0B1yqWlVP1oQM140Z/6FwkVKXNT4s/DX94O9euIf9xHkOyf/qVHkDW8rRCNv8[/tex]即  [tex=6.643x1.286]vnZdloVYKGB22QsiGNFToRntQDbXyzdXMA5WRkr2StY=[/tex](b)  [tex=3.214x1.286]vWAu8X6pR3k0qPr5hNnyaQ==[/tex] , 在  [tex=4.143x1.286]7HRb/A1JAeTJpvhABzjPDRLu3duDVulFIjEeFRVSbyI=[/tex]  内,有[tex=13.357x4.786]ypLOvS+m5Q5Y2/rAug328U78qC/qzoMGjzxF+Z4+lF7jL6xhejJvNOYKXQ1MRPrf622PmXWiCmar0xHDiER3ObJ4ons91mMMX0jZ7i/23HH/A5WoCbWiDSJdgzUmmJUq[/tex]设 [tex=4.286x1.357]5zRUsF7q665fu/jm2c5mPffGNilyHbNF3osL7YdV/f4SDH3N9W6CxliTZV6G0lUyg7emHwdoqjviwE6Pl5Lc8A==[/tex] , 则[tex=25.071x2.857]rNm3BwZwxyf6MF3ynygPElWN2PcISRnYBLUjlXZqE4NIBoQzn5dcMJR0uy7UYXmD+SAcEcxLfgCnYMC1Fgvs8QWpHLBPjppib9jlj8Ng2Mv2TKIiG1qAmEAsaKMAOW06hAuIQgNsgI1fL3GzTZqr3XOQiiScWkDI7AkGqoMiDyEPhUYUb/PsySnrT+T/l41g[/tex](c) 因为 [tex=14.0x1.357]oCx0B1yqWlVP1oQM140Z/7SSSEMNR7kkPpVjSF8cndbvQOnMK5BKwRMrWjWtZZYRVPT2waOEKIPLFcK9MhW71xZhPTUki42YHkifC4t3QT0=[/tex], 所以  [tex=9.857x1.286]Xo/xy3YPTs+XUVJKADB/ZjvgdVYOsj96MS0zKPM99dA89ay/iHLsNm8HsOIwdv7y[/tex], 故[tex=21.357x2.571]2pLeeDDfoTs/GbwezPikgDRrXnnKI78cvHXKwCXOY4/jKrRhUKmYmCew3+Bs7vloTVl19QE/RcfPy68ePAgPi3NqIpUC54ndK5FUn1g2gH6rqbNFbHmTI6V0QJUaoFsTi3kY/peenzvSJcrJA5PJygO+Wk1pNEw4EWv4V579FLEUKa2xVdT3ozv/dWRQJnPL[/tex]

    举一反三

    内容

    • 0

      求下列周期函数的傅里叶级数展开式:[tex=5.857x1.286]qMOLsARs2Ww+rZ87Gf3UqkRFv4VMGpbOjRzRZ3JBlsY=[/tex]   (周期 [tex=0.643x1.286]USGVpa36zb6HMu8k0moHJA==[/tex]) .

    • 1

      求下列周期函数的傅里叶级数展开式:[tex=5.571x1.286]poXx9kzw7gxFgsEa9Qp7sEY4aEblMoGWnnSty8zDy2w=[/tex]( 周期 [tex=0.643x1.286]USGVpa36zb6HMu8k0moHJA==[/tex]) 

    • 2

      将下列周期函数展开成傅里叶级数:[tex=5.143x1.357]/hc/F/pZCirS/Rf1yGjQyw==[/tex]。提示:注意函数[tex=1.857x1.357]bZ4KhrFbnCaidqbMGQZfww==[/tex]的周期为1。

    • 3

      求下列周期函数的傅里叶级数展开式:[tex=7.143x1.357]qAU07a/UMA9qmDdYIFZHiuDbQciYplFbD010frnC35s=[/tex](周期[tex=1.071x1.0]cWYnFY7tUlCT6WhMhv7goA==[/tex])

    • 4

      设[tex=1.714x1.357]RiG8EZN5ZhRw4jDO6I5Cvg==[/tex]为一周期信号,周期为[tex=0.714x1.286]atrPPistVyxj7cY8rjePCQ==[/tex],其傅里叶级数的系数为[tex=1.0x1.0]0GU//5PJyC1ZogOpKG0U3A==[/tex],试用[tex=1.0x1.0]0GU//5PJyC1ZogOpKG0U3A==[/tex]表示下列信号的傅里叶系数。[tex=3.5x1.357]BIloFusPrBF+XgL1twUxa4eqrimDwivo/Cuo3xL6JjM=[/tex]