1
.
.
, .
.
"" (signal, signum ) , . , - , , ; , - - (, , , ..) , - ( ); , , , , .. . , , - , , , , , .
, , : () , ( ).
() . "spectrum" ("") . 1571 , , . 18- , . , 1807 , ( ) ( ) , T = b - a, (, -, 1- ). :
|
|
s(t) =(a0/2) + (an cos(2pnf1t) + bn sin(2pnf1t), f1 = 1/T.
an = (2/T) s(t) cos(2pkf1t) dt, bn = (2/T) s(t) sin(2pkf1t) dt.
, , , , ( ) ( , , ..). , , . .
, , exp(j2pft), - . , .. . , , " ", , f 1/| | - . w = 2pf.
, , : , . , . , . , () , , . . , .