Digital Signal Processing Reference
In-Depth Information
28.2 TDMB
The idea for T-DMB - Terrestrial Digital Multimedia Broadcasting -
comes from Germany, it was developed in South Korea, and its physical
parameters are identical to the European DAB (Digital Audio Broadcast-
ing) standard. T-DMB is intended for the mobile reception of broadcasting
services similar to DVB-H. T-DMB corresponds wholly to DAB which it-
self supports the data stream mode also used in T-DMB (Fig. 28.1.). How-
ever, the "unequal forward error correction" possible in DAB is no longer
possible in this case because the entire subchannel used for the T-DMB
channel must be equally protected.
MPEG4 part 1
object descriptor
stream
to
DAB
data
stream
mode
Section
generator
MPEG2
PSI
(PAT, PMT)
Video
MPEG4
part 10
H.264
AVC
RS
(204,
188)
Conv.
inter
leaver
MPEG4
SL
MPEG2
PES
Audio
Similar to DVB
outer coder
MPEG4
part 3
BSAC
AAC
MPEG4
SL
MPEG2
PES
MPEG4 ISO/IEC 14496
part 1, 3, 10
MPEG2 ISO/IEC 138181
Fig. 28.5.
T-DMB modulator block diagram
In T-DMB, the video and audio contents are MPEG-4-AVC- and AAC-
coded. The video coding uses the new H.264 method. Video and audio are
then packaged in PES packets and are then assembled to form an MPEG-2
transport stream (Fig. 28.5.) which also contains the familiar PSI/SI tables.
The transport stream is then error protected similarly to DVB-C, i.e. with
Reed Solomon RS(204, 188) error protection plus Forney interleaving, af-
ter which the data stream is docked onto DAB in data stream mode (Fig.
28.6.).
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