Lecture 3: Signal acquisition and processing
Two channels, complex Fourier transformation
- a + \b —y \Y
UJ
UJ
sR{Y(üj)}        Signal in channel 1: $t{y(t)} Q
-1-1 i-1-1 ^^^^
ó—	
	
0-	
	
Signal in channel 2: ^{y(t)}
0)
n
CD
n
o t/)
0)
71 O c
3
o'
SR{y(w)}
Signal in channel 1: SR{y(i)}
0
n
fD
n
o
Signal in channel 2: Q{y(t)} ZZ'
-■-1 i-■-1 *
J	1
	
	
1	1
3
o'
sR{Y(üj)}        Signal in channel 1: $t{y(t)}
	i
0^	
	
T|
IQ
^{y(cj)}        Signal in channel 2: 3{y(t)}
n
n
cn
Discrete signal —> Aliasing
-to
CD C
c
TO
sz u
c
TO
c CO
3
E
1-<	1-1 ■ ■ BMiUufc.........
	■ X " 1! 5 f i aa ■ *
		
	t Qx = Q2 - 2tt,	/At
-to
q; c c
TO
u c
TO C
	L ■I a hi? ? • E: £: a im.
	» s ■ * •
t
cjQi = Q2 - 2tt/A£
Unknown phase —> Phase correction needed