Digital Signal Processing Reference
In-Depth Information
4.5 kHz
5 kHz
9 kHz
10 kHz
18 kHz
20 kHz
Fig. 30.2.
DRM spectra at 4.5, 5, 9, 10, 18 and 20 kHz bandwidth with the same
channel frequency in each case; it must be noted that the channel frequency does
not always correspond to the band center of the DRM spectrum; compare also Ta-
ble 30.3. (K
min
/K
max
).
Table 30.2.
DRM modes and their physical parameters
DRM
robustness
mode
Symbol
duration
[ms]
Carrier
spacing
[Hz]
t
guard
[ms]
t
guard
/t
symbol
No.
of symbols
per frame
A
24
41 2/3
2.66
1/9
15
B
21.33
46 7/8
5.33
1/4
15
C
14.66
68 2/11
5.33
4/11
20
D
9.33
107 1/7
7.33
11/14
24
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