Glossary
GLOSSARY
3G-SDI
Serial Digital Interface (SDI) is a serial link standardized by ITU-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
fi
rst revision of the standard, SMPTE 259M, was de
fi
ned to carry digital representation of analog
video such as NTSC and PAL over a serial interface and is more popularly known as standard-de
fi
nition (SD) SDI. The data rate
required to transmit SD SDI is 270 Mbps. With the advent of high-de
fi
nition (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 commonly called the HD SDI
interface and is de
fi
ned by SMPTE 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 vested interest in extending the life of their infrastructure.
Fortunately, SMPTE recently rati
fi
ed a new standard called SMPTE 424M that doubles the SDI data rates to 2.97 Gbps using the
same 75-ohm coaxial cable. This new standard, also called 3-Gbps (3G)-SDI, enables higher resolution of picture quality required
for 1080p and digital cinema.
DisplayPort
Digital display interface developed by the Video Electronics Standards Association (VESA). This royalty-free interface is primarily
used to connect a video source to a display device such as a computer monitor, though it can also be used to transmit audio, USB,
and other forms of data. VESA designed it to replace VGA, DVI, and FPD-Link. Backward compatibility to VGA and DVI by using
active adapter dongles enables users to use DisplayPort
fi
tted video sources without replacing existing display devices.
DVI
Digital Visual Interface is a display interface developed in response to the proliferation of digital
fl
at panel displays.
The digital video connectivity standard that was developed by DDWG (Digital Display Work Group). This connection standard 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 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.
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy per surface unit becomes
lower than the applicable exposure limit on the cornea or on the skin. The light beam is considered (to be) unsafe for exposure if
the distance from a person to the light source is less than the HD.
HDCP
High-bandwidth Digital Content Protection 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-De
fi
nition Multimedia Interface
(HDMI), Gigabit Video Interface (GVIF), or Uni
fi
ed Display Interface (UDI) connections, even if such copying would be permitted by
fair use laws. The speci
fi
cation is proprietary, and implementing HDCP requires a license.
HDMI
HDMI (High-De
fi
nition Multimedia Interface) is a compact audio/video interface for transferring uncompressed video data and com-
pressed/uncompressed digital audio data from a HDMI-compliant device ("the source device") to a compatible computer monitor,
video projector, digital television, or digital audio device. HDMI is a digital replacement for existing analog video standards.
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the characteristics of the communication path
between two devices using either D-SUB 9 pins or D-SUB 25 pins connectors. This standard is used for relatively short-range
communications and does not specify balanced control lines. RS-232 is a serial control standard with a set number of conductors,
data rate, word length and type of connector to be used. The standard speci
fi
es 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.
Scheimp
fl
ug 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 plane 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 intersect in a line below the projector for downward lens tilt.
SMPTE
Society of Motion Picture and Television Engineers - A global organization, based in the United States, that sets standards for
baseband visual communications. This includes
fi
lm as well as video standards.
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