ISDB-T
The Japanese answer to digital terrestrial TV is ISDB-T − Terrestrial Integrated Services Digital Broadcasting. The standard of the same name was adopted in 1999. ISDB-T uses coded orthogonal frequency division multiplexing (COFDM) in the 2K, 4K, and 8K modes. The RF signal in the 6 MHz bandwidth channel is divided into 13 segments. Owing to this segment concept, wideband and narrowband transmission can be implemented. ISDB-T is used in Japan. ISDTV, the Brazilian DTV standard, is based on the ISDB-T standard.
1-segment ISDB-T
A special form of ISDB-T is the 1-segment mode, which is used specially for mobile reception by means of handhelds. The narrow spectrum permits the reception of TV and audio content at low energy consumption.
ISDB-Tsb
ISDB-Tsb is the terrestrial digital sound broadcasting specification. The technical specification is very similar to the ISDB-T specification, with the exception that ISDB-Tsb uses a form of narrowband transmission with 1 and 3 segments.
ISDB-T Frequency 470 MHz
- 862
MHz
558 MHz
- 566
MHz
Channel 32 (VHF)
Modulation
DQPSK, QPSK, 16QAM, 64QAM
COFDM (13-segments) Bandwidth
6/ 7/ 8 MHz (5,57 MHz) Number of Services per RF Channel
x Peak Data Rate 0.28 Mbit/s
- 1.787
Mbit/s
per segment, 13 segments in total Max. Speed 800 km/h
(2K)
400 km/h
(4K)
200 km/h
(8K) Cell Radius
trial distance of 9 km Video Source Coding
MPEG-2, MPEG-4, H.264
