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Motion picture compression technique used in digital television sets

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  1. Abstract
  2. Introduction to digital television
  3. Why use digital television?
    1. Crystal clear picture and sound
    2. Big picture
    3. Multicasting
    4. Data casting
    5. Interactive application
  4. Technical background
  5. Compression and MPEG (Moving Picture Expert Group)
    1. Why MPEG?
    2. MPEG-1
    3. MPEG-2
  6. Video compression
  7. Set Top Box with a conditional access system
  8. Conclusion
  9. References

Digital television is a completely new way of broadcasting and is the future of television. With the advent of digital technology, digital audio and video compression and other advanced signal processing, it is possible to transmit and receive broadband data over co-axial cable and through satellite and terrestrial. Digital television is a telecommunication system for broadcasting and receiving moving picture and sound by means of digital signals, in contrast to analogue signals in analogue (traditional)Television. It uses digital modulation data, which is digitally compressed and requires decoding by a specially designed television set or a standard receiver with a set-top box. For all delivery mechanism a digital set-top box is needed at the customer's premises. It receives the digital transmission and decodes video, audio programs to display on normal Television Receiver.

[...] Using Motion Picture compression technique like MPEG, the difference picture is produced by subtracting every pixel in one picture from the same pixel in the next picture. MPEG-1 and MPEG-2 standards are similar in basic concepts. They both are based on motion compensated block based transform coding techniques, while MPEG-4 deviates from these more traditional approaches in its usage of software image construct descriptors, for target bit-rate in the very low range REFERENCES Digital Television News Figure- Set-Top-Box with Conditional Access System Introduction The development of digital Television and interactive services is already underway in various locations around the globe. [...]

[...] MPEG-2 It was finalized in 1994, and addressed issues directly related to digital television broadcasting such as the efficient coding of field- interlaced video and scalability. Also the target Bit rate was raised between 4 and 9 Mb/sec, resulting in potentially very high quality video. MPEG-2 consists of profiles and level. The profile defines the bit stream scalability and the colour space resolution, while the level defines the image resolution and maximum bit-rate per profile. Probably the most common descriptor in use currently is Main Profile, Main Level (MP@ML)which refers to 720 x 480 resolution video at 30 frames/sec, at bit-rate up to 15Mb/sec for NTSC video. [...]

[...] By contrast, a well designed HDTV transmission system with transmission content represented by the binary digits 1 and 0 can provide an almost can be automatically corrected and ?noise' becomes a thing of past Digital Television .big picture A digital signal can deliver far more information, and offers more options than today's analog signal. Digital television can deliver high definition movie-quality television: crystal clear pictures, CD-quality channel "surround sound," and a wide screen format (16 x 9 aspect ratio, rather than today's 4 x 3 ratio) Multicasting Instead of transmitting a single, high definition program, broadcasters can use this digital signal to transmit on one channel at least four programs in resolution of today's standarddefinition TV (SDTV). [...]

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