Texas Instruments DW30 Video, Scan Line, Scan Rate, Slidebar, Source Setup, Switcher, Sync

Appendix A: Glossary

S-Video	f 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.
Scan Frequency	f The horizontal or vertical frequency at which images are generated. Also known as
	scan rate or refresh rate.
Scan Line	f One horizontal line on the display.
Scan Rate	f The horizontal or vertical frequency at which images are generated.
SECAM f 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.
Slidebar	f 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.
Source	f 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.
Source Setup	f See Channel.
Switcher	f A signal selector that can be connected to a projector for the purpose of adding more
	sources.
Sync	f 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.
Sync Width	f The duration of each sync pulse generated by a computer. The sync width is part of
	the blanking time.
TTL Video	f A type of RGB video with digital characteristics.
Terminated	f 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).
Throw Distance	f 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	f Throw ratio = throw distance / screen width. Typically used to differentiate lenses.
Tint	f Balance of red-to-green necessary for realistic representation of NTSC signals.
Variable Scan	f The ability of a projector to synchronize to inputs with frequencies within a specified
	range.

A-6 Christie DS+60/DW30/Matrix 3000 User’s Manual 013-100149-02 Rev. 1 (01/07)