37-傅里葉變換的基本性質(編輯修改稿)
2024-08-21 16:10 本頁面
【文章內容簡介】 0 ??? FettfFTFtfFTtj????則設0,)(1)]([????abaaFeabatfFT abj為實常數??19 )].52([),()]([)7(293179 ??? tfFTFtfFTP 求設 ?解法二：先尺度后時移 ?? 5)()]5([ jeFtfFT ????? 25)2(21)]52([ jeFtfFT ???解法一：先時移后尺度 )2(21)]2([ ?FtfFT ??? 25)2(21) } ]25(2{[)]52([ jeFtfFTtfFT ?????)(1)]([aFeabatfFT abj ??????? 25)2(21)]52([ jeFtfFT ???20 .23號的頻譜求三脈沖信例 ?)()()()( 000 TtfTtftftf ?????)(0 tf)2()]([)( 00 ???? SaEtfFTF ???)]c o s(21)[2()1)(()()()()(0000TSaEeeFeFeFFFTjTjTjTj????????????????????????21 )]c o s (21)[2()( TSaEF ????? ???22 .) ] }2([)({)(33試求其頻譜信號已知雙例 ????????? tSatSatfSa ccc)]1()1([)]([ ???? ??? uutSaFT)()()]1()1([)(0 cccccc uuuuF ????????????? ?????????)2()()]2([)()( 00 ???????? ?????? tftftSatSatf cccc)1) ] (()([)()()(2200???????????jccjeuueFFF?????????23 )1)](()([)( 2 ??????? jcc euuF ??????)si n (2)2c o s(22)]2[ si n ()]2c o s(1[)2si n ()2c o s(11222?????????????????????????jej)]()([)s i n (2)( cc uuF ??????? ????)]2([)()(: ??????? ??? tSatSatfSa cccc信號雙24 )]2([)()(: ??????? ??? tSatSatfSa cccc信號雙c??? ?25 )]()([)s i n (2)( cc uuF ??????? ????)]2([)()(: ??????? ??? tSatSatfSa cccc信號雙c??? ?26 六、頻移特性 為常數則設 00 ),(])([),()]([ 0 ???? ? ?FetfFTFtfFT tj ?? ?)()()(])([ 0)( 000 ??????? ???? ?? ? ?? ??? ?? ??? FdtetfdteetfetfFT tjtjtjtj2co s2s i n000000tjtjtjtj eetj eet???????? ????)]()([21]c o s)([ 000 ????? ???? FFttfFT)]()([2]s i n)([ 000 ????? ???? FFjttfFT（調制特性） 27 ..,)(),c o s ()()(430試求其頻譜函數如圖所示脈寬為脈幅為為矩形脈沖其中已知矩形調幅信號例??EtGttGtf ??)2()()]([ 1
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