Digital Signal Processing Reference
In-Depth Information
EXACT RECONSTRUCTION of the TRUE NUMBER of GENUINE HARMONICS by FPT
(+)
: NOISY FID
POLE − ZERO CANONICAL FORM of FPT
(+)
: P
+
K
(z)/Q
+
K
(z) = (p
+
K
/q
+
K
(z−z
+
k,P
)/(z−z
+
k,Q
)
zFPT
(+)
and pFPT
(+)
; TWO COMPLEMENTARY SPECTRAL REPRESENTATIONS of FPT
(+)
:
K
)
Π
k=1
zFPT
(+)
(
) : ZEROS of FPT
(+)
; ARGAND PLOT for ALL ZEROS z
+
k,P
in FPT
(+)
via P
+
•
K
(z) = 0
pFPT
(+)
(o) : POLES of FPT
(+)
; ARGAND PLOT for ALL POLES z
+
k,Q
in FPT
(+)
via Q
+
K
(z) = 0
FROISSART DOUBLETS (POLE − ZERO CANCELLATIONS): z
+
k,P
= z
+
k,Q
(confluence of
′•′
&
′
o
′
)
GENUINE HARMONICS in the FIRST QUADRANT, INSIDE the UNIT CIRCLE C ( |z| < 1 ), RANGING from # 1 (Lipid) to # 25 (Water)
FROISSART DOUBLETS OUTSIDE C : GENUINE & SPURIOUS HARMONICS SEPARATED in 2 DISJOINT REGIONS, |z| < 1 & |z| > 1
B
0
= 1.5T
TOTAL NUMBER of
PARTIAL FID LENGTH USED
N
P
= 2K
T
= 256
1
HARMONICS
K
T
= K = 128
1
Lipid
0.8
PADE : FPT
(+)
0.6
NUMBER of
GENUINE HARMONICS
K
G
= K
T
− K
F
= 25
0.4
CONVERGED
0.2
C
0
25
Water
−0.2
−0.4
−0.6
−0.8
NUMBER of
FROISSART DOUBLETS
K
F
= 103
−1
−1
−0.8
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
0.8
1
Re(z
k
)
FIGURE 6.3
Froissart doublets for unequivocal determination of the exact number K
G
of
the genuine harmonics from the total number K
T
≡K of all the harmonics
reconstructed by the FPT
(+)
for the FID with input data from Table 3.1 cor
rupted with random noise. The FPT
(+)
separates the genuine from spurious
harmonics in the two nonoverlapping regions, inside and outside the unit
circle C, respectively.
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