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Idiomas disponibles
Idiomas disponibles
Glosario de términos
Term
Description
Screen Gain
As it applies to projectors, gain is the measurement of a projection
screen's light reflectance with unity gain being one. A high gain
screen will reflect more light along a narrower path than lower gain
screen. Screen gains under one use a gray screen to absorb ambient
light to help maintain contrast ratios.
Screen
A 12V connection from a projector to an electric screen which tells
Trigger
the screen to deploy when the projector is turned on and roll up
when the projector is turned off.
SDI
Serial Digital Interface (SDI) is a standard for digital video
transmission over coaxial cable. The most common data speed is
270 megabits per second (Mbps). However, speeds of up to 540
Mbps are theoretically possible. A related standard, known as high-
definition serial digital interface (HD-SDI) provides a nominal data
rate of 1.485 Gbit/s Standard 75-ohm cable is used.
SDTV
Standard Definition TeleVision. A class of digital television (DTV)
that refers to the 480i format. 480i is an interlaced video format that
produces a full frame of 480 lines of video in two successive fields.
The first field includes the odd lines and the second field includes the
even lines. Sometimes used to refer to regular television.
SECAM
Sequential Couleur avec Mémoire. A television standard closely related
to PAL but with a different method of sending colour information. Runs
at 625 horizontal lines of resolution updating 25 frames a second.
Used in France and Russia as well as other countries. Many eastern
European countries are starting to phase out SECAM in favor of PAL.
Shielded
A feature of speakers and cables where a metal layer is added to
contain and protect a signal from creating or receiving electromagnetic
interference.
Short Throw
A lens designed to project a large image from a short distance.
Lens
Short Throw
A projector with a short throw lens.
Projector
Short Throw
A projector that mounts on a wall adjacent to the projection screen. The
Wall Mount
throw distance is generally just a few inches and allows people to move
Projector
freely through the room without concern of intercepting the light path.
SHP
Super High Pressure. A type of projector lamp.
Signal-to-
The ratio of noise to signal measured in dB. The higher the number,
Noise Ratio
the better.
SPL
Sound Pressure Level. Commonly used to describe a speaker's
efficiency at one watt at 1 meter distance. The actual amount of
sound output using dB. There are various weightings used such as
A, B or C which reflect the human ear's sensitivity at different sound
levels. A-weighting is used for levels up to 55dB SPL, B-weighting
from 55dB SPL to 85dB SPL and C-weighting for 85dB SPL up. A
quiet office is 40dB SPL and a rock concert is 110dB SPL.
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