AJA FS2 User Manual
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Genlock
A circuit that phase-locks to a reference video input and produces timing signals
used by other circuits, such as a frame sync, to lock video to the reference.
HDTV (High-
Definition
Television)
High Definition Television refers to the highest-resolution formats of the DTV
formats. Offering twice the vertical and horizontal picture resolution of standard
definition, an HD picture is much sharper. HDTV has a widescreen aspect ratio of
16:9. HD formats 1080i and 720p both offer reduced motion artifacts like ghosting
and dot crawl.
HD-SDI
Refers to a high definition signal provided on a serial digital connection.
High Definition
A video format consisting of either 720 active lines of progressive video or 1080
active lines, using either progressive or interlaced scanning.
HDMI
High Definition Multimedia Interface is a standard consumer-level single-cable
digital video and audio interface. HDMI handles uncompressed HD or SD video in
many video and computer formats and eight channels of digital audio. Several
different connectors are commonly used for HDMI, including the 19-pin semi-
trapezoidal-shaped Type A connector used on the FS2.
Interlaced
Scanning
A scanning method based on the visible screen showing every odd line at one scan
of the screen and the even lines in a second scan.
Keyer
A circuit that inserts one video signal into another. For example, a caption might be
inserted into background video.
Letterbox
Letterbox refers to the image of a wide-screen picture on a standard 4:3 aspect ratio
screen. Usually black bars are shown above and below the picture to fill the unused
space. Letter-boxing maintains the original aspect ratio of the source (often a film
source of 16:9 aspect ratio or wider).
Luminance
The brightness or black-and-white component of a color video signal. Luminance
determines the level of picture detail.
Processing
Amplifier (Proc
Amp)
A circuit that cleans up a video signal by correcting the signal gain, black level, hue,
and saturation to desired specifications.
Progressive
Scanning
Progressive scanning provides a picture made up of 720 or 1080 horizontal lines
scanned progressively in succession, within a vertical frame. The frame repeats 30
times a second.