2.2, , ,. .
, . , . , - (. . 2.3 2.4).
, .
:
, .
2.1 .
2.1.
/ | ||
.
, .
, . , .
(3.1)
.
(3.2)
- ( )
(3.3)
(3.3), , , , ,
(3.4)
.
(3.1) (3.2), ,
(3.5)
(3.2)
h(t).
, (3.6)
W(p) - .
- ( ) w(t).
. (3.7)
, . , f(t)
|
|
X(p)=W(p)× F(p), (3.8)
, (3.9)
.. t t w(t - t). w(t) . k(t).
f(t) = af× sinwt. (3.10)
,
, (3.11)
, (3.12)
(. (3.10) (3.11)).
,
..
(3.12)
. (3.13)
(3.14)
( )
, (3.15)
(), ().
(3.15)
bx = afW(jw). (3.16)
(3.10) (3.11),
. (3.17)
. (3.18)
(3.15) ,
W(jw) = Re W(jw) + jIm W(jw) = U(w) + jV(w) = A(w) , (3.19)
A(w) = - , (3.20)
j(w) = arctg(V(w)/U(w)) - . (3.21)
(3.18) (3.19)
x(t)=Im[A(w)af ]= A(w)af × sin[wt+j(w)]=ax × sin[wt+j(w)]. (3.22)
, ,
ax = A(w)af (3.23)
j(w) = arg W(jw).
(3.22) (3.23) .
.
- .
A(w) j(w) () () .
A(w) j(w) .
, , : . ()? .
(. (2.44))
W(p)= .
p jw,
W(jw)= . (3.24)
, W(jw)= A(w) (3.25)
Wi (jw)= Ai (w) (3.26)
(3.25) (3.26) (3.24),
A(w) = ,
,
A(w)= ; (3.27)
j(w) = . (3.28)
(3.27) (3.28) , . , . (3.27) :
|
|
L(w) = 20lgA(w) = ;
Li(w) = 20lgAi(w).
. . ( /), , 0,1 1, 1 10 ..
mw = m × ( 2 9),
m - ,
mw - ( ).
() . A(w), L(w)=20lgA(w) .
j(w) .
, , (. 3.1).