... FFF, N À 1: 4: 4: 24
Equation (4. 4.23) is called the analysis equation for calculating the spectrum from the
signal, and (4. 4. 24) is called the synthesis equation used to reconstruct the signal from ... as
X!jX!je
jf
x
!
, 4: 4:9a
Y!jY!je
jf
y
!
: 4: 4:9b
Substituting (4. 3.18) and (4. 4.9) into (4. 4.8),we have
jY!je
jf
y
!
jH!kX!je
jf!f
x
!:
4: 4:10...