Glossary
DVI
DigitalVisual Interface is a display interface developed in response to the proliferation of digital flat panel displays.
Thedigital video connectivity standard that was developed by DDWG (Digital Display Work Group). Thisconnection standard offers
two different connectors: one with 24 pins that handles digital video signals only, and one with 29 pins that handles both digital
andanalog video. This standard uses TMDS (Transition Minimized Differential Signal) from Silicon Image and DDC (Display Data
Channel) from VESA (Video Electronics Standards Association).
DVI can be single or dual link.
EBU
European Broadcasting Union. An organization of European broadcasters that, among other activities, produces technical state-
ments and recommendations for the 625/50 line televisionsystem.
Gamma
Thetransfer characteristics of most cameras and displays are nonlinear. Fora display, a small change in amplitude when the signal
levelis small produces a change in the display brightness level, but the same change in amplitude at a high level will not produce
thesame magnitude of brightness change. This nonlinearity is known as gamma.
Luminance
The component of a videosignal that includes information about its brightness.
NTSC
Nationaltelevision system committee. The organization that developed the analog television standard currently in use in the U.S.,
Canada, and Japan. Now generally used to refer to that standard. The NTSC standa rd combines blue, red, and green signals
modulated as an AM signal with an FM signal for audio.
OSD
On screen display
PAL
Phasealternate line. The television broadcast standard throughout Europe (except in France and Eastern Europe, where SECAM
isthe standard). This standard broadcasts 625 lines of resolution, nearly 20 percent more than the U.S. standard, NTSC, of 525.
Progressive scan
A video scanning system that displays all lines of a frame in one pass.
Projector address
Address installedin the projecto rto be individually controlled.
RS232
AnElectronic Industries Association (EIA) serial digital interface standard specifying the characteristics of the communication path
betweentwo devices using either DB-9 or DB-25 connectors. This standard is used for relatively short-range communications and
doesnot specify balanced control lines. RS-232 is a serial control standard with a set number of conductors, data rate, word length
andtype of connector to be u sed. The standard specifies component connection standards with regard to computer interface. Itis
also called RS-232-C, which isthe t hirdversion of the RS-232 standard, and is functionally identical to the CCITT V.24standard.
Logical’0’ is > + 3V, Logical ’1’ is < - 3V. The range between -3V and +3V is a the transition zone.
RS422
AnEIA serial digital interface standard that specifies the electrical characteristics of balanced (differential) voltage, digital interface
circuits. This standard is usable over longer distances than RS-232. Thissignal governs the asynchronous transmission of computer
data at speeds of up to 920,000 bits per second. It is also used as the serial port standard for Macintosh computers. When the
differencebetween the 2 lines is < - 0.2V that equals with a logical ’0’. When the difference is > +0.2V that equals to a logical ’1’..
SECAM
Sequential couleur avec mémoire. The television broadcast standard in France, the Middle East, and most of Eastern Europe,
SECAMprovides for sequential color transmission and storage in the receiver. T he signals used to transmit the color are not trans-
mittedsimultaneously but sequentially line for line. SECAMprocesses 625 lines, a maximum of 833 pixels per line and 50 Hz picture
frequency. SECAM is used as a transmission standard and not a production standard (PALis typically used).
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