Digital Signal Processing Reference
In-Depth Information
CONSECUTIVE DIFFERENCE SPECTRA in FPT
(−)
; FID LENGTH: N/M and N/(2M) with N = 1024, M = 1−64
Subtraction of 2 Spectra; FID Length: N/32, N/64
Subtraction of 2 Spectra; FID Length: N/4, N/8
12
12
N/32 = 32
N/4 = 256
8
8
B
0
=1.5T
B
0
=1.5T
N/64 = 16
N/8 = 128
4
4
0
0
−4
−4
FPT
(−)
(N/32) − FPT
(−)
(N/64)
FPT
(−)
(N/4) − FPT
(−)
(N/8)
−8
−8
−12
−12
5
4
3
2
1
5
4
3
2
1
(i) Chemical shift (ppm)
(iv) Chemical shift (ppm)
Subtraction of 2 Spectra; FID Length: N/16, N/32
Subtraction of 2 Spectra; FID Length: N/2, N/4
12
12
N/16 = 64
N/2 = 512
8
8
B
0
=1.5T
B
0
=1.5T
N/32 = 32
N/4 = 256
4
4
0
0
−4
−4
FPT
(−)
(N/16) − FPT
(−)
(N/32)
FPT
(−)
(N/2) − FPT
(−)
(N/4)
−8
−8
−12
−12
5
4
3
2
1
5
4
3
2
1
(ii) Chemical shift (ppm)
(v) Chemical shift (ppm)
Subtraction of 2 Spectra; FID Length: N/8, N/16
Subtraction of 2 Spectra; FID Length: N, N/2
12
12
N/8 = 128
N = 1024
8
8
B
0
=1.5T
B
0
=1.5T
N/16 = 64
N/2 = 512
4
4
0
0
−4
−4
FPT
(−)
(N/8) − FPT
(−)
(N/16)
FPT
(−)
(N) − FPT
(−)
(N/2)
−8
−8
−12
−12
5
4
3
2
1
5
4
3
2
1
(iii) Chemical shift (ppm)
(vi) Chemical shift (ppm)
FIGURE 3.8
Consecutive difference spectra for absorption total shape spectra in the
FPT
(−)
for the adjacent signal lengths N/32−N/64 (i), N/16−N/32 (ii),
N/8−N/16 (iii), N/4−N/8 (iv), N/2−N/4 (v), N−N/2 (vi).
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