37-傅里葉變換的基本性質(zhì)(參考版)
2025-07-28 16:10本頁面
【正文】 4)]2([ ??? Fd djFjttfFT ??)].2([),()]([)1(293179 ttfFTFtfFTP 求設(shè) ???)(1)]([ aFaatfFT ??36 八、積分特性 )(1)()0(])([),()]([ ???????? FjFdfFTFtfFT t ??? ???則設(shè))(1)()(]1)()[(])()[(])()([])([])([???????????????????????????FjFdejfddtetufdtedtufdtedfdfFTjtjtjtjtt??????????? ?? ?? ????????????????????????????)(1)0()(])([ ??????? FjFdfFT t ?????37 )(1)0()(])([ ??????? FjFdfFT t ????????? jtuFT1)()]([ ??.: 號的傅里葉變換利用積分特性求階躍信例? ??? t dtu ??? )()( ])([)]([ ? ??? t dFTtuFT ???)(1)0()()]([ ????? FjFtuFT ?? 1)( ??F38 ?????????????)(1)0()0(0)(73000tttttttty的頻譜求圖示的截平斜變信號例0t01t)(tft? ??? t dfty ?? )()()(1)0()(])([ ??????? FjFdfFT t ?????)()2()]([ 200?? ? FetSatfFTtj?? ?39 ? ??? t dfty ?? )()()(1)0()(])([ ??????? FjFdfFT t ?????200)2()(tjetSaF ??? ??200)2(1)(])([)]([tjtetSajdfFTtyFT ???????? ?????? ??????????????)(1)0()0(0)(73000tttttttty的頻譜求圖示的截平斜變信號例40 0?)(?F)(21 0?? ?F)]co s ()([ 0 ttfFT ?0?0???)(21 0?? ?F)]()([21]c o s)([ 000 ????? ???? FFttfFT41 相乘 )(tg)cos( 0t?)co s ()( 0 ttg ?m?? ?0m?? ?0 0?0??)( 0 m?? ??)( 0 m?? ??)]co s ()([ 0 ttgFT ?42 相乘 低通 )co s ()( 0 ttg ?)co s( 0t?)(0 tg)(tgm?? ?0m?? ?0 0?0??)( 0 m?? ??)( 0 m?? ??)]co s ()([ 0 ttgFT ?43 )(4)2(2)2(2)(22tEtEtEdttfd?????????????44 )4(si n84)2c o s(4422)()(2222????????????????EEEEeEeEFjjj???????? )(4)2(2)2(2)(
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