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Resolution
Resolution usually refers to the density of lines, and dots per line, that represent an
image. It is measured by the number of pixels displayed. A higher number of lines and
dots provides sharper and more detailed picture content. Analog television pictures have
over 200,000 color pixels while HDTV—at 1080 vertical pixels by 1920 horizontal pixels—
offer greater than 2 million pixels per picture.
Sampling
A digital process by which analog information is measured in intervals to convert analog
to digital.
SDTV
(Standard-
Definition
Television)
Standard Definition Television pictures are higher quality than NTSC, however, they do
not reach the quality and resolution of HD. SDTV is based on 480 lines of vertical
resolution, available with both interlaced and progressively scanned formats.
SD-SDI
Refers to a standard definition signal provided on a serial digital connection.
Sidebars
See “Barn Doors.”
Upconverting
Process by which a standard definition picture is changed to a simulated high-definition
picture.
Widescreen
Widescreen TV is a picture with a 16:9 aspect ratio. 16:9 is the aspect ratio of movie screen
and widescreen DTV formats used in all HDTV (High Definition TV) and some SDTV
(Standard Definition TV); it stands for 16 units of width for every 9 units of height.
