: . , . , .
. , . , : , .
So - ,
s(t) , . . s( t) = s(t), e , bk= 0 sk=k. s( t) = - s(t) , bk= sk k = 0.
. . . . 1.6. . , .
, (sk ω1; S, sk2 2 ω1 . .).
. . 1.7 , ,
, . , , . 1.6, ∆F= 6ω1 ω, . . . So, ω , ∆F= 6ω1.
, . , ( . 1,6ω1). .
, , . .
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|
(1.1) , , ∆F . , . , . , , 9599% . , 9,5% 300...3400 .
:
1. ?
2. ? .
3. .
4. .
1. . , .
[1, . 22-30].
1. u(t) = Um sin(ω1t +ψ), - ∞ t + ∞. , 90˚?
.. | .. | .. |
Spectrum | ||
Periodic | ||
Acyclic | ||
Model of a signal | ||
ққ ү | The time form | |
ү | The spectral form | |
ұқ құ | Constant component | |
Harmonic |
3
: . . , , , , , . , .
, . :
.
-
.
.1.
.2. :
; ;
-
-:
U (t) = (Um+ Um sinΩt) * sinwt;
:
U (t) = Um sinwt +m Um/2cos(w+Ω)t - m Um/2cos(w-Ω)t, m , m = Um/≥ Um.
, - 2 , - . (w+Ω) , (w-Ω) . - m =0, : Um≤ Um. , .. , -. m = 0,5.
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- ,
, , 66,6%, 33,3%. , ().