Runco Video Xtreme VX-40d Owner's Operating Manual page 105

Appendix A: Glossary
RGB Video
RS232
RS422
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
Vertical Frequency
Runco VX-40d/-50d/-60d/-80d Owner's Operating Manual
The video output (analog or digital) of most computers. Analog RGB video can have 3, 4,
➤
or 5 wires — one each for red, green, and blue, and either none, one or two for sync. For
three-wire RGB, the green wire usually provides sync. (See TTL Video).
A common asynchronous data transmission standard recommended by the Electronics
➤
Industries Association (EIA). Also called serial communication.
A less common asynchronous data transmission standard in which balanced differential
➤
voltage is specified. RS422 is especially suited to long distances.
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 avec 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 projector's lens and the screen. Also called "Projector-to-Screen
➤
Distance". Always use the correct Runco throw distance formula to calculate the proper
throw distance 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.
➤
The frequency at which images are generated. Vertical frequencies vary amongst sources.
➤
Also called vertical scan rate.
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Appendix A: Glossary