Glossary
GLOSSARY
3G-SDI
Serial Digital I nterface (SDI) is a serial link standardized by I TU-R BT.656 and the Society of Motion Picture and Television Engineers
(SMPTE). SDI transmits uncompressed digital video over 75-ohm coaxial cable within studios, and is seen on most professional
video infrastructure equipment. The first revision of the standard, SMPTE 259M, w as defined to carry digital representation of analog
video such as NTS C and PAL over a serial interface and is more popularly known as standard-definition (SD) SDI. The data rate
required t o transmit SD SDI is 270 Mbps. With the advent of high-defin ition (HD) video standards such as 1080i and 720p, the
interface was scaled to handle higher data rates of 1.485 Gbps. The 1.485-Gbps serial interface is comm only called the HD SDI
interface and is defined by SMP T E 292M, using the same 75-ohm coaxial cable. Studios and other video production facilities have
invested heavily on the hardware infrastructure for coaxial cable and have a ve sted interest in extending the life of their infrastructure.
Fortunately, S MP TE rece ntly ratified a new standard called SM PTE 424M that doubles the SDI data rates to 2.97 G bps using the
same 75-ohm coaxial cable. This new standard, also called 3-Gbps (3G)-SDI, enables higher res olution of picture quality required
for 1080p and digital cinema.
DisplayPort
Digital display interface dev eloped by the Video Electronics Standards Ass ociation (VESA) . T his royalty-free interface is primarily
used to connect a video s ource to a display device such as a computer monitor, though it ca n also be used to transmit audio, USB,
and other forms of data. VESA designed it to replace VGA, DVI, an d FPD-Link. B ack ward compatibility to VGA and DVI by u sing
active adapter dongles enables users to use DisplayPort fitted video sources without replacing existing display devices.
DVI
Digital Visu al Interface is a display interface developed in r esponse to the proliferation of digital flat p anel displays.
The digital video c onnectivity standard that w as developed by DDW G (Digital Display Work Group). T his connection s tandard offers
two different connectors: one with 24 pins that handles digital video signals only, and one with 29 pins that handles both digital
and analog video. This s tandard uses TM DS (Transition Minimized Differential Signal) from Silicon Image and DDC (Display Data
Channel) f rom VES A (Video E lectronics Standards Association).
DVI can be single or dual link.
HD
Light beam H azard Distance (HD) is the distance from the source at w hich the intensity or the ener gy per surface unit becomes
lower than the applicable safety limit. The lig
ht beam can thus be considered as dang erous if the operator is closer from the source
than the H D.
HDCP
High-bandwidth Digital Content Pro
tection is a form of digital copy protection developed by Intel Corporation to prevent copying of
digital audio and video content as it travels across DisplayPort, Digital Visual Interface (DVI), High-Definition Multimedia Interface
(HDMI), G igabit Video Interface (GVIF), or Unified Display Interface (UDI) connections, even if such copying would be permitted by
fair use laws. The specification
is proprietary, and implementing HDC P requires a license.
HDMI
HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompr essed video data and com-
pressed/uncompressed digita
l audio da ta from a HDM I-compliant dev ice ("the source device") to a compatible comp uter monitor,
video projector, digital television, or digital audio device. HDM I is a digital replacement for existing analog video standards.
RS232
An Elec tronic Industries Ass
ociation (EIA) serial d igital interface s tandard s pecifying the characteristics of the communication path
between two devices using either D-SUB 9 pins or D-SUB 25 pins c onnectors. This standard is used for relatively short-range
communications and does not s pecify balanced control lines. RS-23 2 is a serial control standard with a set numb er of conductors,
data rate, word lengt
h and type of connector to be used. The standard spec ifies component connection standards with regard to
computer interface. It is also called RS-232-C, which is the third version of the RS-232 standard, and is functionally identical to the
CCITT V.24 standard. Logical ’0’ is > + 3V, Logical ’1’ is < - 3V. The range between -3V and +3V is the transition zone.
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When the DMD plane and lens plane
are parallel, the plane of sharp focus will also be parallel to these two planes. If, however, the lens plane is tilted with respect to the
DMD plane, the pl
ane of sharp focus will also be tilted according to geometrical and optical properties. The DMD plane, the principal
lens plane and the sharp focus plane will inte rsect in a line below the projector for downward lens tilt.
SMPTE
Society of M oti
on Picture and Television Engineers - A global organization, based in the United States, that sets standards for
baseband visual communications. This includes film as well a s video standards.
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