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  • 1. 2011 - 2012 1

2. , . , 2 3. . , t, , , t .3 4. , . , ..4 5. . , . x1=1t xx2A A2A2x2=A2(t+) ,x1 t A1 : x = x1 + x2 5 6. . , . : x=A(t+) :x x2 A2 A=A12 + A2 + 2A1 A2 2A2 A2 : 2x1 2 = t A11 + 2 . 6 7. ... 1. , =0 x1 = 1t x2 = 2t x = x1 + x2 = Ao(t+) Ao = 1 + 2 + 2 1 2 2 2 = 0 =1 = ( 1 + 2 ) 2 = 1 + 2 22 0 = =0 = = 0 = 01 + 2 1 + 2 1 x = (1 + 2)t H .7 8. ... 2. , = x1 = 1t x2 = 2(t+) 2>1 x = x1 + x2 = Ao(t+) Ao = + + 2 1 22122 = = 1 = + 2 A1 A2 = 2 122 2( 0 ) 1 2 2 = 1 2 = = = 2 = 0 = 01 + 2 1 + 2 1 = x = (2 - 1)(t+) H . 8 9. ... a2. , = x1 = 1t x2 = 2(t+) 2 = 1 = x = x1 + x2 = Ao(t+) Ao = + + 2 1 2 2 122 = = 1 = = 1 = 2 + 2 2 A2 = 0 9 10. !!! , x1=A1(t+01) x2=A2(t+02) 02>01) =02-01Ao = 1 + 2 + 2 1 2 (02 01 ) 2 2 2 (02 01 ) =1 + 2 (02 01 ) x=(t+01+) 10 11. B. , (1~2) .x1=A1t , x2=A2t :x = x1 + x2 = A1t + A2t= A(1t + 2t) A , ... + + = 2 2 2, 1 + 2 1 2 x = 2 A t t 2 2 11 12. B. , (1~2) . :1 - 2 1 + 2x = 2A ( t ) ( t) 2 2 1 + 2 = 2 1 2 !!! A(t ) = 2 A t 2 x = A(t ) t , !!! 12 13. x = A(t ) t1. 2 A(t ) = 2 A 1t 0 2 2 2. , , 1 + 22f1 + 2f 2 f +f = 2 f = f = 1 2 22 23. . . () . 13 14. x1=A1t x2=A2t : f = f - f2 1 14 15. f - f2 A = 2A2( 1t ) .2 f1 + f2 f = .2 f = f - f2 1 . 1 1T == f f - f2 1 . 15 16. , f1=4000z f2=4004Hz. f1 + f 2 4000 + 4004 8004f = = = f = 4002 Hz 222 , f = f1 - f 2 = 4000 4004 f = 4 Hz 4 4 . 16 17. . t1 t2 , = t1 - t2, t1 t2 , (t)=01 2 1 2 A(t ) = 0 2 A t = 0 t =0 22 1 2 1 2 t = t = (2 + 1)2 2 22 =01 2 2 f1 f 21t= t1 = t1 = 2 2 2 2 2 f1 f 2 =1 1 23 2 f1 f 233 t= t2 = t2 =22 2 22 f1 f 2 17 18. =01 2 2 f1 f 21 t= t1 = t1 =2 22 22 f1 f 2 =1 1 23 2 f1 f 233t= t2 = t2 = 22 2 22 f1 f 2311T = t 2 t1 = T =2 f1 f 2 2 f1 f 2f1 f 2f = |f1 - f2| 18 19. !!! 1 - 2 =( ) .2 . 1 + 2 =( ) 2 2 (s). 1 - 2