中国传媒大学_数字信号处理_2013年_考研真题

  • 格式:pdf
  • 大小:1.57 MB
  • 文档页数:2

r

* IZIK ï # A A ?#

20 1 3 1 1# J'AP t$. + V ï-t ù: JQ % X +?'A # l't '

x g j.; x. x u u. . as

1,Y.J11#,:3 : 1*-#!6>.1J1/iî-in, 4%' ;>'ë, *a3ë-#:F-4r, IA.SW-EAK.

;:.t: -. :d#J,JAtA ( #. 15 J>, 4.t 1. 5 Jy )

l . Q iJ.A f'q#zt/L lt itl # is/' h - ê,k # A %: * 5 ys , - ikkhr !: # 1 ys , l!t ,': yk ti

'#L-IIIA lûûû ,/,.4 2-FFT % # #lW/.1:ti' , % W ikk?h ,

) lk #- ,'t p , .t- 1. i.t # e1'. A h gzx -

2 . Jt' 'T' A X tt l'V (:. .Y ik X $.1 , t4 , #. . . J/ ,4i t.E , T= ' A kb ;$'

t.E .

3. x (z?) h 9 .#... 7.4 $3% #'1 , X. 9 ,#,,x DFT h T(k) , X Y T(0) =2 3 , T( 1) =2 . 2-7, T(6) =6+2 7,

4-(7) --4-2

./, 'A.M A. -r(2) = , -,r(3) = -

4 . A # 1#/ 1,t ît Q f'/ F I R 3)t îk # , 14. )7.% /# Jol ?

.% Jr Q -$ # f/J. ;4J X , it'

4 # f/J' A' X .

-- - î,-1- # - J./ #f A ( #. 5 8 kk )

1 . ( 9 y ) 4- -jj jyj.j .j. xa (? ) = 11 + COs (2zr x 50? )1 cos (2r x 1 000/ ) yjj nyy jjjyj yj.. y

1/à , * X' CL 4/ bh x, ( t ) /fJ. /é' ;t' *1 .'#.' J> #' , $: 4: ,.: zl T- 4. ;#. 11# #Y, 'A 1: é; .

( 1 ) X z1q 1,t1, X' f. IX Tg - ( 2 ) :: A X è.l l'iq l51 T ; ( 3 ) X /# X @'-I tf 1)

. N.

2. ( 8 kk ) (?s yn )% #'j x!(n) = t1(n.(,j,2, 0, 3, 5) , xatn) = R4(n4 , -1û (1) ;J-7 A (1) Vj11X ,1-1 (z?)

' i'j.n x, ( n) (f,7. 6 > . x D F T -

k 2 n'-.i a( 1 ) ')

.A7Y #'1 yln) (?t- 6 .#.,x DFT J'(/c) = ..:) (kje , X' yln) -

' jk :!.: ( 2 ) ik/./ #l1 z (z2) @J. 6 ,4L DFT Z(k) = ..:) (/c)A'a(/c)c 3 , X- zlnt -

3. ( 84/ ) i,t î.iEN ,/..7Y #'1 x (n) f6. '# 'j#.ïs -T- n't- !tt Ax (k) A' z%Pa r seva 1 '% :$ A

1

. .%'- l j N - lsjxtsljz - -s!

.v(yc)Ia

n ?V ,-n ' --

ij)

'. 4 . ( 9 I,k ) 4, - ,Y- X /fJ #1 # h 4 4 . 1 k H z 0. I,t $ -# #t #')' =T- $t' )# h X # ?$j1 #- h 4 8 k H z

i (t #)) ttr

-# ytï')' -!. , !: 1 k)t 7-- #A >: Ar4.4-tt 1# , fn (!1 r,y p'ft .

. f

j 96

.j1:

t

)( 1 ) ,:#.' L i'f'rl M Y: zl q 'h-J fi L ïlj. , # $4, C J

.S r.ù ; ( 2 ) X /23 Ik # H ( e j * ) , # $4, r/l J

.Y r.j -

t L H(ei'o) i M

x44,lktn) - x-l:ktn)

5 . ( 1 2 V ) U.u )E rl F 1 R )W i k # /1/7. -$ 'f %. l f X' 7 lzjr V h :

hlnj = (0.54,,.,:) , 0.3, 0.75, 1 .0, 0.75,0.3, 0.5)

( 1 ) SA ))t J/.t#p% .T ,,% 9: 't.kis jk )24 i/,t# ? # $,4. C,I 1

.Y. rtp .

( 2 ) i: )l4 î& )4 îk # 0. A' èt 4 t't (: , .%. .X' 4 YJA ï # 4. .@ îk # ?A #11 ::

.4' .

( 3 ) :.1 Q SA ).4 îk # ,Q X i: 1,t t'/ ,4' îk # , X. $: -fY 7(J, $). (.: 1,t

,,% H ( e/''' ) , tkt ,X' ?#1 # Prh

?.'!). h Hleil '/-= 1 ) jt. :.4. îk # t. -$ jk. Cf 84. prlu /

.'!') hj (n) , t: ,7. ;,%) ï't .k, #- :2 (fJ. ( ï: :i: . i: :i: . #; i: .

,./:1:

. f's jk 'kiis ïà *4 ) 1,t #: 2+ izt.l ?

6. (124/)

( 1 ) 'X .Jl1 711 *4 41/.7- X 2 C' I'@ :% #.1 (/J. FFT'X 1: , i.Y X 8 #,x % #l1 x (z?) = ( 1 , - 1 , 1 , - 1 , 2 ,

1 , 1 , 2 ) ft. D F T Q. ïi. . .%. X ,V V à/i Q' V , X Y )l$ X i.i X ;

( 2 ) i: )l$ 'X !:. ; ( 3 ) s't' #* x ( z?) h D F T h ïlj.

-= - .1:1*. A ( #. 2 7 % , # A 9 k )

1 . ( 9 4/ ) 76 DFT Jt. ii /.1.' C (i1 ï')' -% :i4 J'è' $/ V èJ' WJ jL 4 l ,1l î/z # (/:. -= ;f# J

,1 #. 7% ï1 k. ? ! l Al

î;t ;fL 6/J. 1YL ; 7% ïi k. ? SA Xt è# ?4. ?# Q % ?

2 . ( 9 J/ ) $,0. C/I ïi #. X fk 'jlt ;# J'Jl . /JJ 11 ;Az ifll Y1 A 7* ;Az ifll , -= '#' .',t

. l'@ h ;'4 .% .

3. (9 4/) fn ïgl /fJ FFT 7'' A.1, jk 'pi ;# JJl , ($ )ly 74 Jzfwv $, , X ï/t X> X lp ,f7, Xl: ?

!

1

!

97

.

2