Current system that uses magnetic waves to transmit
pictures and sound. These broadcast signals create
images by interlaced scanning
lines (measures at 480i). Analog television is
due to be converted to DTV (Digital
Television) in December 2006. Most consumers will
be able to view DTV on their analog televisions with
the use of an inexpensive receiver to decode the broadcast
Describes the viewing area on a display in regards
to its width in conjunction with its height. Full-screen
displays have an aspect ratio of 4:3 and wide screen
displays have an aspect ratio of 16:9.
The quality of color in reference to its hue and saturation.
In a display, the picture chrominance can be adjusted
to add grayness or color saturation to a picture. Video
signals use chrominance combined with luminance to
create picture quality.
Measures to the difference between the lightest
white point and darkest black point in a display. A
higher contrast ratio shows more detail and gives an
overall better quality picture.
Audio coding system created by Dolby Laboratories in
the 1970s. Designed for multichannel audio output but
will also support single (mono) audio channels. Full
surround sound known as Dolby Digital 5.1 has five
channels (left, right, center, left surround, right
surround) plus a .1 low channel frequency for deep
bass sound. Some HDTVs contain
the programming to deliver Dolby Digital 5.1 using DTV with
Digital Television. A new broadcasting method using
computer code to deliver a high quality picture and
Dolby Digital sound. DTV is scheduled to go into effect
nationally by late 2006. Older analog televisions will
be able to translate DTV signals with a decoder, but
not display as high definition without a HDTV compatible
||SDTV - Standard Definition Television.
Television that receives analog broadcast signals,
typically has an 4:3 aspect ratio, outputs non-Dolby
Digital audio, and has a picture quality less than
480p or 480 progressively scanned
||EDTV - Enhanced Definition Television. Television
that can receive digital television signals of at 480p
or higher, have an 4:3 or 16:9 aspect ratio, and is
capable of delivering Dolby Digital audio with HDTV
||HDTV - High Definition Television. See HDTV.
Television that has a picture quality of 720p to 1080i,
has an 16:9 aspect ratio, is capable of delivering
Dolby Digital audio.
HDTV-Ready/Monitor refers to a display that
can transformed into a HDTV with a tuner or other hardware.
HDTV Tuner is a separate device that has
the ability of receiving and outputting HDTV signals.
This tuner may be also referred to as a decoder, receiver
or set-top box.
Process used to create a television picture by alternating
lines of information by scanning the odd-numbered lines
first, then filling in with the even-numbered lines.
The higher in number of interlacing creates a more
detailed, better-quality picture. Interlaced scanning
is used by all analog broadcast systems.
LCD or Liquid Crystal
A display engineered by compressing an electrically
reactive, liquid crystal solution between two sheets
of polarized material, then charging the solution by
two electrodes. The current passes through the solution
to activate the crystals in an aligned pattern.
Refers to the level of brightness in a display. A component
of a video signal that works in conjunction with chrominance to
control the quality of a display picture.
Display that creates images by using phosphors that
react to a plasma-state gas when electric current is
passed through it. The picture is visible when a vertical
and horizontal line intersects to make a pixel or point
Process of creating a picture by rapidly displaying
all lines of a information simultaneously. This method
is used by high definition digital signals and requires
higher bandwidth than analog signals.
Measures picture quality of a display by the amount
of pixels per inch. The higher in number the resolution
(or pixels) is in a display, the better picture quality.