Lecture 3: Signal acquisition and processing
Two channels, complex Fourier transformation
- a + \b —y \Y
UJ
UJ
How many frequencies?
How many frequencies?
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
Unknown phase —> Phase correction needed