dB — decibel — A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels.
Diagonal Screen — A method of measuring the size of a screen or a projected image. It measures from one corner to the opposite corner. A 9 ft high, 12 ft wide, screen has a diagonal of 15 ft. This document assumes that the diagonal dimensions are for the traditional 4:3 ratio of a computer image as per the example above.
DHCP — Dynamic Host Configuration Protocol — A network protocol that enables a server to automatically assign a TCP/IP address to a device.
DLP® — Digital Light Processing™ — Reflective display technology developed by Texas Instruments, using small manipulated mirrors. Light passing through a color filter is sent to the DLP mirrors which arrange the RGB colors into a picture projected onto screen, also known as DMD.
DMD — Digital
DNS — Domain Name System — An internet service that translates domain names into IP addresses.
Focal Length — The distance from the surface of a lens to its focal point.
Frequency — It is the rate of repetition in cycles per seconds of electrical signals. Measured in Hz (Hertz).
HDCP —
HDMI —
Hz (Hertz) — Unit of frequency.
Keystone Correction — Device that will correct an image of the distortion (usually a
Maximum Distance — The distance from a screen the projector can be to cast an image that is usable (bright enough) in a fully darkened room.
Maximum Image Size — The largest image a projector can throw in a darkened room. This is usually limited by focal range of the optics.
Minimum Distance — The closest position that a projector can focus an image onto a screen.
76
Glossary
