Kamis, 19 November 2009

digital television technology

Visual Display Equipment


Televisions - Digital

Digital television is an exciting new television technology that is replacing existing free-to-air analogue television. Digital television in Australia provides improved picture and sound quality, extra channels plus a variety of new features. Digital Television commenced 1st January 2001, and since then it has expanded it's coverage from major city capitals to more regional areas across the country. The major free to air channels have also added to the services they provide with electronic program guides, High Definition Demonstrations and also additional channels that can not be seen with the analogue service.

  • Much improved reception capability.
  • A 16 x 9 aspect ratio, or screen shape known as Widescreen.
  • High Definition Television
  • High quality audio
  • Electronic program Guides (EPG’s)
  • Multi-channel programs on the ABC and SBS
  • Radio programs on the ABC & 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 in a lifestyle or magazine program.
  • Broadcasters will be allowed to run more than one show on a single channel, for example if a sporting match runs overtime, the view can choose to either continue watching the game, or change to the scheduled program.
  • Closed caption programming for the hearing impaired viewers will be done for all English language news and current affairs programmes.
  • Over time, interactive television services, including selected internet shopping, computer games etc. will be provided.


What benefits will digital television provide?
Digital television is a far more efficient and flexible transmission system than the current analogue system. It allows broadcasters to offer viewers a range of new and different services.

What happens to my existing TV set?
Free-to-air broadcasters will simulcast (ie, broadcast both analogue and digital signals) for at least eight years, so viewers will continue to be able to use current analogue television sets to receive broadcasts until the end of 2008. Beyond the end of the of simulcasting, the addition of digital-to-analogue converters in the form of a set top box,will still be able to receive digital transmissions with analogue TV sets.


A set-top box decodes digital transmissions into a form suitable for display on analogue television sets. Analogue 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 is an integrated digital television receiver?

This is a television set that contains all the components necessary to receive and display digital transmissions. Wide screens, high level audio capability and high-resolution displays will generally distinguish integrated digital television receivers. They will not require a set-top box.

What Is High Definition Television (HDTV)?
HDTV offers approximately twice the vertical and horizontal resolution of a PAL signal, providing picture quality approaching that of a DVD. HDTV is particularly suited to large screen television display. It has an aspect ratio of 16:9 and at least 1,000 lines making up the picture. Conventional TV uses 4:3 aspect ratio and 625 lines.
Digital television is a replacement technology for existing free-to-air analogue television. It will provide better picture quality and reception, plus a variety of new features to enhance your 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.

What is Standard Definition Television (SDTV)?
Standard definition television (SDTV) is digital television with improved reception capability when compared to the existing analogue service. SDTV will be in widescreen format, provide enhancements and multi-channeling, and eliminate ghosting and other errors found in analogue TV.
Set-top boxes are available that convert only SDTV, or SDTV & HDTV. The Federal Government requires Broadcasters to provide a digital SDTV signal all times, as-well as HDTV.
Digital TV will be the future, and ALL A.V. are following it’s progress all the way. For more information or a quote on these new and exciting products, contact AVD now.

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