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Active Matrix
LCD display that uses a solid
state device to control each pixel cell for a more quality image. ANSI
American National Standards Institute Aspect
Ratio
Ratio of height to width of a screen or image. Audio
In
Input audio connection for an electronic device such as a VCR, usually
female RCA jacks. Audio Out
Output audio signal from a device such as a VCR or CD player, usually
female RCA jacks. Bandwidth
The maximum information handling capacity of an electronic network or
connection. Baud
Data transmission speed, 28.8K baud is 28,800 bits per second. CD
ROM
Compact Disk Read-only-Memory. Similar to audio CD but used for data
storage. Composite Video
Combines vertical-horizontal synchronization signals, color and picture
into a single signal line. Compressed
Resolution
An electronic method of reducing the resolution of a signal to operate
on a lower resolution device. An example would be an LCD Projector
that has a maximum resolution of 800x600 pixels being used with a
computer that is displaying 1024x768 resolution. The image quality will
be reduced when compressed.
Compressor
Audio level control device for automatically adjusting sound volume.
Convergence
Alignment of Red, Green, and Blue video guns to combine and produce a
single color video display.
CRT
Cathode Ray Tube or picture tube
DAT
Digital Audio Tape recorder/player Decibel
(db)
Unit of measure for comparing sound levels or electronic signal levels. DLP
Digital Light Processing or Micro Mirror Technology, used in some Video/Data
projectors. DVD
Digital Versatile Disk, similar to CD but has higher storage capacity. Equalizer
Audio device with multiple frequency controls for adjusting sound tone
quality. Fast Fold Screen
Da-Lite brand that is assembled on-site to form front
or rear projection screens. HDTV
High Definition Television Hertz
(Hz)
Unit of frequency measurement. 1,000 Hz = 1,000 cycles per
second. IEEE
Institute of Electrical & Electronics Engineers, sets standards. ISDN
Integrated Services Digital Network. High speed internet access,
digital video and voice. Interface
Connection or isolation device such as connecting a telephone line to
sound equipment. Interlaced
Two horizontal video scans (odd, even) per video frame, NTSC is a 2:1
interlace system. Keystone
Trapezoid distortion usually caused by the projector being located lower
than the screen bottom. Kilohertz
(Khz)
Unit of frequency measurement. 1Khz = 1,000 cycles per
second. Laser
Pointer
Handheld device that projects a bright red light, typically used for manually pointing
at a projection screen. LCD
Liquid Crystal Display LCD
Projector
An electronic Video/Data projector for displaying video and computer
images on a large projection screen. LCD Projection Panel
A flat panel LCD device that is placed on an overhead projector to display
video and computer images. Light
Valve Projector
Very bright projection system for theater size screens. Lumens
Unit of light measurement typically for projectors. Luminance
Video imaging relative brightness Lux
Unit of light measurement typically for cameras Megahertz
(Mhz)
Unit of frequency measurement. 1Mhz = 1,000,000 cycles per
second. Mixer
Audio or Video device used for adjusting and combining multiple signals from various sources. Monitor
CRT based TV or Computer video display. Multimedia
Any combinations of Video, Audio and Visual presentations. Non
Interlaced
Only a single horizontal video scan per video frame. NTSC
National Television Standards Committee. (U.S. Television uses
NTSC standards) Overhead
Projector
Used for displaying 8½ x 11 transparencies on a projection screen. PAL
Phase Alternate Line. Television standards used primarily in
Western Europe. Parallel
Port
Computer input/output connection that transmits data multiple bits at a
time. (Ex. Printer) Pixel
The smallest picture element making up the computer video display. Rear
Screen Projection
Locating the projector behind a translucent screen to be viewed from the
front. Resolution
Number of pixels contained in the maximum screen viewing area. RGB
Red, Green, Blue are the basic light components that make up color TV and
computer displays. Scan Rate
Horizontal and Vertical scan speeds, usually specified in Kilohertz or
Hertz. SCSI
Small Computer Systems Interface (scussy) Scanning
The electronic process of moving an electron beam across the CRT
surface. SECAM
Television standards, the TV system used in France and throughout the
Eastern Block Republics. Serial
Port
Computer input/output connection that transmits data 1 bit at a time.
(Ex. Mouse) Slide Projector
Used for displaying 35mm and 2"x2" slides on a projection
screen. Slide View Box
Box with light source and translucent panel used to view and sort slides
used by slide projector. SPL
Sound Pressure Level, intensity measurement of sound waves. Sync
Synchronization, scanning signals that are used to keep the video
display generator locked to the source. SVGA
Super Video Graphics Array. Resolution = 800x600 pixels SXGA
Super Extended Graphics Array. Resolution = 1280x1024 pixels Telephone
Interface
Device to connect a telephone line to sound system equipment for large
group conference calls. VGA
Video Graphics Array. Resolution = 640x480 pixels Video
In
Input video connection for an electronic device such as a VCR, female RCA
jacks or BNC. Video Out
Output video signal from a device such as a VCR or Camera, female RCA
jacks or BNC. XGA
Extended Graphics Array. Resolution = 1024x768 pixels
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