DekTec DTC-300 StreamXpress User Manual
Page 50
DTC-300-SP – StreamXpress
USER MANUAL
50
ISDB-T is the standard used for Terrestrial broadcast where ISDB-T has been adopted (Mostly Japan,
Brazil and many other South American countries).
There are lots of parameters for ISDB-T so most of the parameters are set under Params.
The ISDB-T format is a very versatile modulation format and allows up to three transmissions
channels in a single RF Channels. The different channels can be Mobile, HDTV, and SDTV for
example. There are 13 segments in an ISDB-T transmission that be allocated in different manners
depending on the applications. 1seg is typically used for mobile TV broadcasting.
ISDB-T use470 MHz-770 MHz, bandwidth of 300 MHz, allocate 50 channels of the over air
spectrum, namely ch.13-ch. 62, each channel is 6 MHz width. These 50 channels, ch.13-ch.62, are
called "physical channel.
ISDB-T signals can be carried on cable channels without changing the modulation. In the case the
RF channel is translated to a different frequency.
ISDB-T modulator accepts 188 bytes MPEG-2 TS but many can also accept TMCC format. The
TMCC format is a 204 byte packet TS format. The first 188 bytes are reserved for the MPEG-2 TS
and the 16 additional bytes carry the modulation information. The StreamXpress is capable of
streaming the TMCC encoded stream and using the modulation information to modulate the MPEG-
2 TS. DekTec offers a utility called TMCCENC.exe to create TMCC encoded streams. Please contact
DekTec support for more information at
Variable
Type
Description
Details Diag
ISDB-T
Parameters
Display
Display the ISDB modulation information if file is TMCC
encoded
#1
1
CH#
Display/
Selection
Select the pre allocated RF output channel
#2
2
Frequency
Drop
Down
Set the bandwidth of the RF channel
#3
3
Use TMCC
info
Tick Box Will appear when file open has TMCC encoded information.
Tick to use the file settings
#4
4
Params…
Button
Select this to change the ISDB-T modulation parameters
#5
5