Editing ISDB (section)

===Technical specification===
''' Segment structure '''

ARIB has developed a segment structure called [[Orthogonal frequency-division multiplexing#BST-OFDM used in ISDB|BST-OFDM]] (see figure).
ISDB-T divides the frequency band of one channel into thirteen segments. The broadcaster can select which combination of segments to use; this choice of segment structure allows for service flexibility. For example, ISDB-T can transmit both [[LDTV]] and HDTV using one TV channel or change to 3 SDTV, a switch that can be performed at any time. ISDB-T can also change the modulation scheme at the same time.
<!--
{| border=2 style="font-weight:bold"
|- height="150"
| bgcolor="#ccffff" | s 13
| bgcolor="#ccffff" | s 11
| bgcolor="#ccffff" | s 9
| bgcolor="#ccffff" | s 7
| bgcolor="#ccffff" | s 5
| bgcolor="#ffffde" | s 3
| bgcolor="#ffffde" | s 1
| bgcolor="#ffffde" | s 2
| bgcolor="#ccffff" | s 4
| bgcolor="#ccffff" | s 6
| bgcolor="#ccffff" | s 8
| bgcolor="#ccffff" | s 10
| bgcolor="#ccffff" | s 12
|}
The most Japanese documents describes as below numbering and allocation. example, http://www.nhk.or.jp/strl/publica/dayori-new/jp/qa-0311.html (All rights reserved, reference only) -->
{| class="wikitable" style="font-weight:bold"
|- height="150"
| bgcolor="#ccffff" | s11
| bgcolor="#ccffff" | s 9
| bgcolor="#ccffff" | s 7
| bgcolor="#ccffff" | s 5
| bgcolor="#ccffff" | s 3
| bgcolor="#ccffff" | s 1
| bgcolor="#ffffde" | s 0
| bgcolor="#ccffff" | s 2
| bgcolor="#ccffff" | s 4
| bgcolor="#ccffff" | s 6
| bgcolor="#ccffff" | s 8
| bgcolor="#ccffff" | s10
| bgcolor="#ccffff" | s12
|}

The above figure shows the spectrum of 13 segments structure of ISDB-T.
<br />(''s0'' is generally used for [[1seg]], ''s1''-''s12'' are used for one [[HDTV]] or three [[SDTV]]s)

====Summary of ISDB-T====
{| class="wikitable"
|-
! rowspan=5 | Transmission<br />channel coding
! Modulation
| colspan=2 | 64QAM-OFDM,<br />16QAM-OFDM,<br />QPSK-OFDM,<br />DQPSK-OFDM<br />(Hierarchical transmission)
|-
! Error correction coding
| | Data: <br /> Inner coding: Convolutional 7/8,5/6,3/4,2/3,1/2 <br />Outer coding: Reed-Solomon(204,188)
| | TMCC: <br /> Shortened code (184,102) <br /> of Difference Cyclic Code (273,191)
|-
! Guard interval
| colspan=2 | 1/32,1/16,1/8,1/4
|-
! Interleaving
| colspan=2 | Time, Frequency, bit, byte
|-
! Frequency domain multiplexing
| colspan=2 | BST-OFDM <br />(Segmented structure OFDM)
|-
! colspan=2 | Conditional Access
| colspan=2 | Multi-2
|-
! colspan=2 | Data broadcasting
| colspan=2 | ARIB STD-B24 (BML, ECMA script)
|-
! colspan=2 | Service information
| colspan=2 | ARIB STD-B10
|-
! colspan=2 | Multiplexing
| colspan=2 | MPEG-2 Systems
|-
! colspan=2 | Audio coding
| colspan=2 | MPEG-2 Audio (AAC)
|-
! colspan=2 | Video coding
| MPEG-2 Video
| MPEG-4 AVC /H.264*
|}

* H.264 Baseline profile is used in one segment ([[1seg]]) broadcasting for portables and Mobile phone.
* H.264 High-profile is used in ISDB-Tb to high definition broadcasts.