第2章信号与系统的基本概念

1、0001)(ttt00001)(tttttt)2()2()(tttG)2(2) 1()()() 1()1()2() 1( 2)1()()() 1()1()(ttttttttttttttf000)(ttt1)(dtt0000)(tttttt1)(0dttttdtdttdt)()()()(tdtttdtttdtt)()()()(0000)()(tt)()()()()()0()()(000tttftttftfttf)()()()0()()(00tfdttttffdtttf)(|1)(00attatat)(tt)()2(2teett) 1()2sin(ttdttt)2() 12(dtttt)1()2(

2、 )35(5 . 15 . 1dtttt)42()2(2td) 1()42(0)(0)(ttt)()(| )2()()2(022tteeteettttt) 1() 1()2sin() 1()2sin(tttt5| ) 12()2() 12(2ttdttt2| )35(0)1()35()2()35()1()2( )35(15 . 15 . 15 . 15 . 15 . 15 . 1ttdtttdtttdtttt4| )2(21)2(21)2()42()2(2222tttdttttdtttt) 1(6) 1(6) 1()42(tddtt0001)(kkkmkmkmk01)()()()()()()0

3、()()(mkmfmkkfkfkkfmmkkfkfkfkfkf)()() 1() 1 ()()0() 1() 1()(0001)(kkkmkmkmk01)()() 1()(kfkfkf) 1()()(kfkfkf)() 1(2)2()() 1()()(2kfkfkfkfkfkfkf)2() 1(2)()() 1()()(2kfkfkfkfkfkfkfknnfky)()() 1()() 1()(kkkk)() 1()()(kkkkdtfftftf)()()(*)(2121)(*)()(*)(1221tftftftf)(*)()(*)()()(*)(3121321tftftftftftftf)(*

4、)(*)()(*)(*)(321321tftftftftftf)(*)()(21tftfty)(|1)(*)(0021tatyatatfatf)()(*)(21tytftf)()(*)()()(2)(1tytftfjiji)(*)()(21tftfty)()(*)(21tytftf)()(*)()1(2)1(1tytftf)()(*)()1(21tytftf)()(*)(00ttftttfdtfttftf)()()(*)()()(tfdf)()()(tdf) 1()(21tetft)2()(2ttf)(*)()(21tftfty) 1()1 (21)1(2)2() 1()()()(*)()()

5、1(2221222121teetdedtedtfftftftytt)(*)()(21tftfty)()(11ftf)()(22ftf)()(22 ff)()(22tff)()(21tff21)()(21ttdtff1t2t)()(21tff)(1tf)(2tf)(*)()(21tftfty1t0)(ty01t2) 1(83)(tty10 t) 12(83)(tty)4(83)(2tty0)(ty21t2t)(1tf)(2tf)(*)()(21tftfty)5 . 0(y)5 . 0()(21ff4725 . 05 . 0)21 (21)5 . 0(y) 1(5 . 1)(5 . 1)1(5 .

6、 1)(5 . 1 *)()(*)()(*)()()1(1)1(1)1(12)1(121tftftttftftftftfty)(1tf)(2tf)(*)()(21tftfty)(1tf)(1tf )( ty )(tynnkfnfkfkf)()()(*)(2121)(*)()(*)(1221kfkfkfkf)(*)()(*)()()(*)(3121321kfkfkfkfkfkfkf)(*)(*)()(*)(*)(321321kfkfkfkfkfkf)(*)()(21kfkfky)()(*)(212211mmkymkfmkf)()(*)(mkfmkkf) 1(2)(1kkfk)2()(2kkf)(

7、*)()(21kfkfky) 1() 5 . 02()1(22)2() 1(2)()()(*)()(2212121kknknnkfnfkfkfkykknnnnn)(1kf)(2kf)(*)()(21kfkfky2 , 9 ,19,25,23,16, 6)(ky)()()()(kfSkytfStykt)()()()()()()()(221122112211tyKtyKtfKtfKtytftytf)(tf)0(q)(ty0t)()0()(tfqty)()0()(2tfqty)()0()(tfdtdqty| )(|)0()(tfqty)()()()(00ttyttftytf)(tf)(ty)()(ttfty)()(tfdtdtytdfty0)()(| )(|)(tftytzxtzszsdydfdttdydttdftytf)()()()()()(0t0k0)(tf0)(kf)()()()()()()()(01)1(1)(01)1(1)(tfbtfbtfbtfbtyatyatyatyammmmnnnn)() 1(