Christie DW30 User Manual page 116

Appendix A: Glossary
S-Video
Scan Frequency
Scan Line
Scan Rate
SECAM
Slidebar
Source
Source Setup
Switcher
Sync
Sync Width
TTL Video
Terminated
Throw Distance
Throw Ratio
Tint
Variable Scan
A-6 Christie DS+60/DW30/Matrix 3000 User's Manual
'
The output from certain video tape players and video equipment. S-Video separates
sync and luminance from color information, typically producing a higher quality
display than composite video.
'
The horizontal or vertical frequency at which images are generated. Also known as
scan rate or refresh rate.
'
One horizontal line on the display.
'
The horizontal or vertical frequency at which images are generated.
'
A video output format of some video tape and disk players (used primarily in France).
SECAM (Sequential Couleur á Mémoire) signals are similar in resolution and
frequency to PAL signals. The primary difference between the two standards is in the
way color information is encoded.
'
A slidebar is a graphical display of an adjustable setting. The numerical setting often
represents a percentage but can be a specific unit such as degrees Kelvin.
'
The device, such as a computer or VCR, connected to the projector for display. A
source may have numerous corresponding channels defined and recognized by the
projector. See Input.
'
See Channel.
'
A signal selector that can be connected to a projector for the purpose of adding more
sources.
'
This term refers to the part of the video signal that is used to stabilize the picture.
Sync can occur in three forms:
1)
"Composite sync": the horizontal and vertical components are together on one
cable.
2)
"Sync-on-green": the sync is part of the green video.
3)
"Separate sync" or "H.SYNC and V.SYNC": the horizontal and vertical
components of the sync are on two separate cables.
'
The duration of each sync pulse generated by a computer. The sync width is part of
the blanking time.
'
A type of RGB video with digital characteristics.
'
A wire connecting a single video source to a display device, such as a projector, must
be terminated by a resistance (usually 75Ω for video).
'
The distance between the front feet of the projector and the screen. Also called
"Projector-to-Screen Distance". Always use the correct Christie throw distance
formula to calculate the proper throw distance (±5%) required for your lens.
'
Throw ratio = throw distance / screen width. Typically used to differentiate lenses.
'
Balance of red-to-green necessary for realistic representation of NTSC signals.
'
The ability of a projector to synchronize to inputs with frequencies within a specified
range.