HDTV

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HDTV
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HDTV
Best Buy ad November 2003
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World TV Standards

• Max. Lines Frames per second
• NTSC 525 30
• (National TV Standards Committee) A color TV
  standard that was developed in the U.S.
  Administered by the FCC, NTSC broadcasts 30
  interlaced frames per second (60 half frames per
  second, or 60 "fields" per second in TV jargon)
  at 525 lines of resolution. NTSC is used
  throughout the world including the U.S., Canada,
  Japan, South Korea and several Central and South
  American countries.
• PAL 625 25
• PAL (Phase Alternating Line) A color TV
  standard that was developed in Germany. It
  broadcasts 25 interlaced frames per second (50
  half frames per second) at 625 lines of
  resolution. Brazil uses PAL M, which broadcasts
  30 fps. PAL is used throughout Europe and China
  as well as in various African, South American and
  Middle Eastern countries.
• SECAM 625 25
• SECAM (Systeme En Couleur Avec Memoire) A color
  TV standard that was developed in France. It
  broadcasts 25 interlaced frames per second (50
  half frames per second) at 625 lines of
  resolution. SECAM is used in France and Russia
  and many countries in Africa, Eastern Europe and
  the Middle East.

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HDTVOriginal Timeline

• November 1999 Affiliates from the top 30 markets
  (which reach 50 percent of U.S. households) must
  have constructed digital facilities.
• December 1999 Stations in some of the major
  markets, including New York, Los Angeles,
  Atlanta and Chicago, were broadcasting digital
  signals.
• May 2002 The remaining markets after the top 30
  (there are 211 total) will have constructed
  digital facilities.
• April 2003 All stations must simulcast at least
  50 percent of their NTSC programs on their
  digital TV channel.
• April 2004 Stations must simulcast 75 percent of
  their NTSC programs on their digital TV channel.
• April 2005 Stations must simulcast 100 percent
  of their NTSC programs on their digital TV
  channel.
• 2006 The Federal Communications Commission has
  targeted this year for the complete conversion
  from analog to digital broadcasting.

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HDTV

• Of the 18 DTV formats, six are HDTV formats, five
  of which are based on progressive scanning and
  one on interlaced scanning. Of the remaining
  formats, eight are SDTV (four wide-screen formats
  with 169 aspect ratios, and four conventional
  formats with 43 aspect ratios), and the
  remaining four are video graphics array (VGA)
  formats. Stations are free to choose which to
  broadcast.
• The formats used in HDTV are
• 720p - 1280x720 pixels progressive
• 1080i - 1920x1080 pixels interlaced
• 1080p - 1920x1080 pixels progressive

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HDTV, EDTV, SDTV
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HDTV, EDTV, SDTV

• The video scanning formats supported by the
• ATSC Digital Television Standard
• Vertical Lines Horizontal Pixels Aspect
  Ratio Picture Rate
• 1080 1920 169 60I 30P 24P
• 720 1280 169 60P 30P 24P
• 480 704 169 43 60I 60P 30P 24P
• 480 640 43 60I 60P 30P 24P

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INTERLACED/PROGRESSIVE
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ASPECT RATIO
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ASPECT RATIO

• Measuring TVs a 25 standard TV will be taller
  than a 25 HDTV

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ASPECT RATIO

• To achieve a similar height, the HDTV screen
  needs to be wider.

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ASPECT RATIO To make a 43 aspect ratio fit the
169 ratio screen, various techniques are used.
Side bars
Normal panoramic
Cropping
Stretching
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