1. High Definition Television (HDTV)*
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High Definition Television (HDTV)
Ching-Kai Huang
Wing Ho Leung
Feng Guo
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2. Overview Technology advancements History Why HDTV?*
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Overview
Technology advancements
History
Why HDTV?
Current TV standards
HDTV specifications
Timeline
Application
Current status
Hardware requirement
Conclusion
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3. Technology advancements*
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Technology advancements
Video cassette recorders (VCR)
laser discs (LD)
digital versatile discs (DVD)
compact discs (CD)
digital audio tapes (DAT)
high definition television (HDTV)
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4. *
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History
First began in 60’s at NHK, the Japan Broadcasting Corporation.
Many different formats were developed in US
In Feb 1993, FCC suggested to form an alliance that would eventually create the best possible system
In May 1993, Grand Alliance formed
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5. Why HDTV? Higher-resolution picture Wider picture*
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Why HDTV?
Higher-resolution picture
Wider picture
Digital surround sound.
Additional data
Easy to interface with computers
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6. Current TV Standards NTSC: National Television Systems Committee*
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Current TV Standards
NTSC: National Television Systems Committee
PAL: Phase Alternation Line
SECAM: Séquential Couleur Avec Mèmoire
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7. HDTV and NTSC Specifications*
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HDTV and NTSC Specifications
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8. Scanning Methods Progressive Scanning vs Interlaced Scanning 9/18/2018*
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Scanning Methods
Progressive Scanning vs Interlaced Scanning
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9. Additional Specs of HDTV*
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Additional Specs of HDTV
System outlined in the ATSC standard is based on the MPEG-2 Main 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
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10. Components of HDTV systems*
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Components of HDTV systems
analog
carrier +
digital
signals
Decoded
video
signals
Display
format
video
signals
Image
Decoder
Display
Processor
digital
signals
Demodulator
Demultiplexer
Decoded
audio
signals
Audio
Decoder
audio
signals
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11. *
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Timeline of HDTV
November 1998: HDTV transmissions begin at 27 stations in the top 10 markets
May 1999: network affiliates in the top 10 markets must show at least 50% digital programming
November 1999: digital broadcasts in the next 20 largest markets
May 2002: remaining commercial stations must convert
2003: public stations must convert to digital broadcasts
2004: stations must simulcast at least 75% of their analog programming on HDTV
2005: stations must simulcast 100% of their analog programming
2006: stations relinquish their current analog spectrum
NTSC TV sets will no longer be able to pick up broadcast signals
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12. Application High definition TV for consumer Medical Purposes*
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Application
High definition TV for consumer
Medical Purposes
Video-on-demand
Internet surfing
Distance Learning
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13. Current Status 18 digital TV formats are approved by FCC*
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Current Status
18 digital TV formats are approved by FCC
More than 27 digital channels being broadcast by ABC, CBS, FOX, NBC
DirecTV has one HDTV channel
Unity Motion is broadcasting three HDTV channels
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14. Hardware Requirement Digital Decoder Digital-Ready TV set HDTV set*
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Hardware Requirement
Digital Decoder
converts digital signals to analog
allow current TV set to work
Digital-Ready TV set
Wide-screen format
progressive scanning
HDTV set
can receive 18 digital input format
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15. *
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Comparison
Current TV
HDTV
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16. Comparison (current TV)*
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Comparison (current TV)
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17. *
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Comparison (HDTV)
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18. *
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Conclusion
The history, standard, application of HDTV have been introduced
HDTV has higher resolution, uses progressive scanning and wider screen leading to better perspective on the scene
HDTV has a promising future and is believed to replace NTSC in near future
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19. References http://nbcin.kxas.com/hdtv-faq.html*
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References
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20. Q:Analog bandwidth of HDTV signals?*
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Q:Analog bandwidth of HDTV signals?
HDTV image size of 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
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21. Q:Aspect ratio of movies vs HDTV?*
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Q:Aspect ratio of movies vs HDTV?
Aspect ratio of HDTV is 16:9. However, aspect ratio of movies has many different formats:
“Movies are always shot so they can be displayed in several aspect ratios at different types of movie theaters, from the shoebox-sized foreign movie houses to the ultra big screen Star Wars jobs.” Franco Vitaliano
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22. Q:Copyright protection for HDTV?*
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Q:Copyright protection for HDTV?
We do not find any group which mention about copyright protection for HDTV.
Currently, broadcast stations sometimes put their logo on the right bottom corner of their analog broadcast programs. We think that this method can still be used as one way for protecting copyright for HDTV.
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