(3.19), (3.20) (3.21) .
W(jw) = = = - j , (3.55)
.. U(w) = ; V(w) = .
A(w) = = ; (3.56)
j(w) = arctg = - arctg wT. (3.57)
. 3.12.
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. 3.12 , 0 ¥ 0 -90.
, w = 1/, A(1/T)= , j(1/T)=-45. . , ( ).
(3.55) 0 ¥. ,
U(-w)=U(w), V(-w)=-V(w).
|
, 0 + ¥ - ¥ 0.
.3.13.
, . .
(3.56), ().
L(w)=20lg =20lg1-20lg . (3.58)
(3.58). .
0 £ w < 1/T L(w) 20lg1. (3.59)
1/T £ w < ¥ L(w) 20lg1 - 20lgwT=-20lgwT. (3.60)
(3.59) (3.60) ( ). (3.59) , (3.60) . () .
, (3.60). , .. /:
L(10w) - L(w) = 20lg1 - 20lg(10wT) - 20lg1 - 20lgwT = -20lg 10 = -20 ,
, -20 /.
w=1/ 20lg 3 .
. 3.14.
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W(jw) = = ,
.. A(w)= j(w)=-p/2, . 3.14.
, , -90 .
-20lg A(w) = 20lg = 20lg1 - 20lg w. (3.61)
(3.61) - , -20 / . w=1-1 L(w)=0 (. . 3.14)
3.1.
3.1.
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|
(, ) | () | |||||
x = k× x, k - | , - | k - , - | 0, - , k - | , - | x(t - t)= x,(t), t - - | |
W(p) | k | T× p | ||||
- h(t) | ||||||
. 3.1.
- | (, ) | () | - | |||
L(w) | ||||||
j(w) |