Concept

High-definition television

Summary
High-definition television (HD or HDTV) describes a television system which provides a substantially higher than the previous generation of technologies. The term has been used since 1936; in more recent times, it refers to the generation following standard-definition television (SDTV), often abbreviated to HDTV or HD-TV. It is the current de facto standard video format used in most broadcasts: terrestrial broadcast television, cable television, satellite television and Blu-ray Discs. Formats HDTV may be transmitted in various formats:
  • 720p (): 921,600 pixels
  • 1080i () interlaced scan: 1,036,800 pixels (≈1.04 Mpx).
  • 1080p () progressive scan: 2,073,600 pixels (≈2.07 Mpx). ** Some countries also use a non-standard CTA resolution, such as : 777,600 pixels (≈0.78 Mpx) per field or 1,555,200 pixels (≈1.56 Mpx) per frame
When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-defin
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