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What is digital television?
Digital television is a replacement technology for existing free-to-air analog services. It will provide better picture quality and reception, plus a variety of new features that enhance the viewing experience.
The digital television industry in Australia will use the DVB (Digital Video Broadcasting) standard, first developed in Europe, rather than the American-developed ATSC standard. DVB is proving to be a very high quality system and is being used in many countries around the world. In Australia it will replace the analog PAL system

 

What benefits will digital television provide?
Digital television is a far more efficient and flexible transmission system than the current analog system. It allows broadcasters to offer viewers a range of new and different services.
Australian digital television features will include
Much improved reception capability, including the elimination of ghosting and other transmission errors

 
A 16 x 9 aspect ratio, or screen shape. This is also known as widescreen. It is similar to the aspect ratio that is widely used in the cinema.
Standard Definition television (SDTV)
High Definition television (HDTV)
High quality audio
Electronic Program Guides (EPGs). A basic EPG can be used by viewers to navigate between channels, identify the currently screening program and the next program ('now and next') on each channel. More sophisticated EPGs can be used to set reminders for program viewing, provide a short synopsis of the content of programs, identify programming in advance for several days, search for programs by genre, and provide access to some enhancements
Multichannel programs on the ABC and SBS
Radio programs on the ABC and SBS
Program enhancements on separate channels to the primary program, eg, additional camera angles on a sports match, statistics about a player, or additional information about a segment in a lifestyle or magazine program.
Broadcasters will be allowed to broadcast more than one channel when certain events, such as sporting matches, extend beyond time due to circumstances beyond the broadcasters' control, and overlap a regularly scheduled news program. This will allow viewers the option of continuing to watch the end of the event or the news bulletin.
Closed captioning of programming for hearing impaired viewers will be done for all English language news and current affairs programs as well as for all prime time programs (6.00pm to 10.30pm).

 

Over time, interactive television services and services, including selected Internet services, home shopping, computer games, etc will be provided by broadcasters and datacasters

 

 

 

 

What is a digital television set-top box?
A set-top box for digital television receives and decodes digital transmissions into a form suitable for display on analog television sets or other display devices, eg computer monitors or projection screens.
Analog television sets currently in use in Australia cannot display digital transmissions on their screens without being connected to such a set-top box converter.

 

 
What does a set top box do?
The capability of a set top box will depend upon its specifications.
A set top box, when connected to an analog television set, will usually give viewers an improved signal, SDTV-equivalent picture quality and multichannelling. Some set top boxes may also provide viewers with datacasting services and video, audio and data enhancements (see What are program enhancements?).
Set top boxes capable of receiving and displaying a HDTV signal may not be available initially.
Set top boxes can provide a picture output to either analog or digital screen displays.

 

What is Standard Definition television (SDTV)?

 

 Standard Definition television (SDTV) is digital television with improved reception capability when compared to the existing analog service.
SDTV will be in widescreen format, provide enhancements and multichannelling, and eliminate ghosting and other errors found in analog transmissions.
The Federal Government requires broadcasters to provide a digital SDTV signal at all times, even when HDTV services are being broadcast. This is to ensure that viewers will always be able to receive a digital transmission - without this requirement some viewers with a digital receiver capable only of receiving and displaying a SDTV signal would not be able to view the SDTV version of the program when the higher quality HDTV signal is transmitted.
SDTV-only integrated receivers and set top boxes are expected to be cheaper than integrated receivers and set top boxes that can display both SDTV and HDTV.

 


What is High Definition television (HDTV)?
High Definition television (HDTV) provides image resolution which is superior to SDTV and to the existing analog, with up to six times the improvement in detail.
This means that the benefits of HDTV are particularly noticeable on larger screen sets and when using projection equipment.
HDTV will be in widescreen format and provide cinema-quality viewing with Dolby surround sound.
Within two years of the commencement of digital broadcasting in an area, and in addition to their analog and Standard Definition transmissions, commercial television broadcasters and the ABC and SBS will be required to provide at least 20 hours per week of programs in HDTV.
HDTV integrated receivers and set top boxes are expected to cost more than SDTV integrated receivers and set top boxes

 

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