Among various technical standard in the world, Hong Kong adopted DMB-T/H national standard for the digital terrestrial television service. This standard used TDS-OFSM for transmitting compressed digital audio, video and other data, which is a multiple-carrier modulation technology. It has a 10 km greater radius of the signal coverage area than the DVB-T, a European standard. It also support the mobile digital TV services on handheld which make this superior than the current Europe standard (DVB-T) which serves only terrestrial. However, this modulation technology supports single-carrier and dual-carrier modulation scheme. Therefore, the complexity of the IC chipset is higher, resulting in higher price of receiver.
Features and Services
In principle, HDTV offers an improved picture quality and relatively free from problems like ghosting and interference. It also provides new features and services that the current analogue broadcasting is unable to support. It can provide electronic program guide (EPGs) which continuously update the menus to provide the latest information of the program schedule from TV companies. i-cable, a cable TV provider, is an example that has provided this service to its subscribers. It is a graphical user interface that takes the channel names, programs titles, program schedule into a table. Subscribers are allowed to search the program menu by time, channel and program from the input devices. Additional program information can be delivered to subscribers when they select a specific program. With EPGs, viewer can connect it to video recorder to record the scheduled program for later viewing.
Another important element is closed-captioning which displays literal script of the dialogue spoken by the hosts, actors or participants, and high quality of synchronization of sound and text. Different from the traditional caption, it is hidden unless the viewer request. The viewer can select... [continues]
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