High Definition Television
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High Definition Television

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All about HDTV pre-2008. Very Comprehensive and in depth about the fundamentals of TV transmission.

All about HDTV pre-2008. Very Comprehensive and in depth about the fundamentals of TV transmission.

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  • 1. Overview • Technology advancements • History • Why HDTV? • Current TV standards • HDTV specifications • Timeline • Application • Current status • Hardware requirement • Conclusion
  • 2. •Video Home System (VCR) & Video CD 330×480 (250 lines) •Digital Versatile Discs (DVD) 9GB /210 Mbps | 720×480 (520 lines) NTSC / 720×576 (576 lines) PAL •Blu-Ray (HD) 150GB / 432 Mbps | 920×1080 (1080 lines) / 1280×720 (720 lines) --------------- •NTSC / PAL 30fps / 25fps •High Definition Television (HDTV) progressive / interlaced
  • 3. BluRay DVD VHS
  • 4. •Color Television Transmission breakthrough in 1940 GC Camarena of Mexico •MPEG is born at NASA’s Video Pattern Recognition entre MPEG has since been used for standardization of video formats. •MPEG-1 standard provided the foundation for DTV But was not popular due to popularity and wide acceptance of ATV •DTV via DTH services took off in late 1990s Popular ones in India are Zee’s DishTV and Tata’s TataSKY •MPEG-2 standard finalized in ‘93 and implemented in 2004 18 countries already run HDTV broadcasts.
  • 5. •Higher-resolution picture •Wider picture •Digital surround sound •Additional data •Easy to interface with computers
  • 6. NTSC: National Television Systems Committee PAL: Phase Alternation Line SECAM: Séquential Couleur Avec Mèmoire TV Standards NTSC PAL ATSC Regions North Asia, Europe, World America South America Standard Channel Bandwidth 6MHz 8MHz 6MHz Aspect ratio 4:3 4:3 16:9
  • 7. •Progressive scan rewrites whole screen at one pass Interlaced scan rewrites half the screen •P-scan draws all the lines of moving pictures in a sequence Interlaced draws odd or even lines at a time •Flickering is more common in interlaced display But anti-aliasing and interpolation techniques have helped reduce flickering •Progressive scan has higher vertical res. Consequently requires higher bandwidth for same no. of frames as interlaced
  • 8. HDTV SDTV
  • 9. •System outlined in the ATSC standard is based on the MPEG-2 Main Profile and MPEG-4 AVC Profile •Video formats span the range of Main Level to High Level •Audio Compression is based on the Dolby AC-3 system with sampling rate 48kHz and perceptually coded •5.1 Channels of surround-sound audio •Transport subsystem based on MPEG-2 Transport Stream •Packets consist of 188 bytes •RF subsystem is 8 VSB
  • 10. •System outlined in the ATSC standard is based on the MPEG-2 Main Profile and MPEG-4 AVC Profile •Video formats span the range of Main Level to High Level •Audio Compression is based on the Dolby AC-3 system with sampling rate 48kHz and perceptually coded •5.1 Channels of surround-sound audio •Transport subsystem based on MPEG-2 Transport Stream •Packets consist of 188 bytes •RF subsystem is 8 VSB
  • 11. •HDTV image size of 1050 by 600 at 30 frames per sec, the bandwidth required to carry that image quality using the analog transmission system is 18MHz. However, it will require more bandwidth to transmit it in digital format. •With the MPEG-2 compression, the bit rate is compressed from more than 1 Gbps to about 20 Mbps, which transmit digitally only require bandwidth 6MHz