Integrated Services Digital Broadcasting (ISDB) is the Japanese standard for the broadcasting of digital television across various broadcasting mediums. ISDB encompasses:
- ISDB-C: Digital cable television.
- ISDB-S: Digital satellite television.
- ISDB-T: Digital terrestrial television.
ISDB supports both Standard Definition TV (SDTV) and High Definition TV (HDTV), featuring multichannel digital audio and an enhanced teletext version. Viewers can watch ISDB content on regular analog televisions through the use of a set-top box, a receiver that converts the incoming digital signal into an analog signal format suitable for conventional TV sets. Eventually, digital receivers will be integrated into televisions.
Similar to the European DVB system, ISDB is based on the transmission of MPEG-2 data containers. These containers can carry a flexible combination of MPEG-2 video, audio, and other data services. The data from different programs are combined in a multiplex, with each container containing Service Information (SI) detailing the broadcasted programs.
Standards for different media vary in how data containers are transmitted, optimizing the transmission for the specific medium. The error correction mechanisms also differ based on the medium.
ISDB-C and ISDB-S are based on the transmission of a single carrier, with data modulation using QPSK or 8PSK for ISDB-S and 64QAM for ISDB-C. ISDB-T, like DVB-T, relies on OFDM transmission of multiple carriers.
Please note that this information is based on the state of ISDB as of my last knowledge update in January 2022. For the most current and up-to-date information, it’s recommended to consult official sources or references in the field of digital broadcasting.