Glossary
GLOSSARY
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3G-SDI
Serial Digital I nterface (SDI) is a serial link standardized by I TU-R BT.656 and the Society of M otion Picture and Television Engineers
(SMPTE). SD I transmits uncompressed digital video over 75-ohm coaxial c able within studios, and is seen on mo st professional
video infrastructure equipment. The fi r st revision of the standard, SMP TE 259M, was defined to carry digital representation of analog
video such as NT S C and PAL over a serial interface and is more popularly known as standard-definition (S D) SDI. The data rate
required to transmit SD SDI is 270 Mbps . With the advent of high-definition (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 defi ned by SMP T E 292M, using t he s ame 75-ohm c oaxial 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, SMPTE recently ratified 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 re quired
for 1080p and digital cinema.
Digital Cinema Initiatives (DCI)
DCI is a joint venture of Disney, F ox, P aramo unt, Sony Pictures Entertainment, Univ ersal and Warner B ros. Studios. DCI’s primary
purpose is to establish and document voluntary specific ations for an open architecture for digital cinema that ensures a uniform and
high level of technical performance, reliability and quality control. Note that the DCI specification is not a standard. Standards for
digital cinema are the domain of the Society of Motion P icture and Television Engineers (SMPTE). "DCI compliant" is a term used to
describe products that conform to the DCI specification. Products that have been tested per the DCI Compliance Test Plan (CTP)
are posted at the DCI compliance web site. Notably, DCI compliance does not require compliance to the full set of SMP T E DCP
standards. A copy of the mos t recent DCI specifi cation can be downloaded f rom the DC I w ebsite (h
ttp://dcimovies.com).
Digital Cinema Package (DCP)
A D igital Cinema Pa ck age (DCP) is a collection of d igital fi les used to store and convey Digital Cinema (DC) aud io, im age, and data
streams. The term has been defi ned by D igital C inema Initiatives ( DCI). G enera l pr actice adopts a file structure that is organized into
a number of usually m ulti-gigabyte size Material eXchange Format (MXF) fi les, which are separately used to store audio and video
streams, and auxiliary index files in XML format. The MXF files contain streams that are compressed, encoded, and encrypted, in
order to reduce the huge am ount of required storage and to protect from unauthorized use. The image part is JPE G 2000 com -
pressed, whereas the audio part is linear P C M . The adopted (optional) encryption standard is AES 128 bit in C B C mode. T he newer
SMPTE standards are used to conform the r ecom mendations among different tool vendors and producers. Interop, the legacy DCP
standard, is still required to be s upported by DCP players.
DisplayPort
Digital display interface developed by the Video E lectronics Standards Association (VES A) . 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 t o transm it audio, US B,
and other forms of data. VESA designed it to replace VGA, DV I, and FPD-L ink. Backw ard compa tibility to VGA and DV I by using
active adapter dongles enables users to use DisplayPort fitted video sources without replacing existing display devic es.
HD
Hazard Distance (HD) is the distance me asured from the projec tion lens at which the intensity or the energy per surface unit becomes
lower than the a pplicable expos ure limit on the c ornea 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.
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HDCP
High-bandwidth Digital Content Protection is a form of digital copy protection developed by Intel Corporation to prevent c opying of
digital audio and video content a s it travels ac ross D isplayPort, Digital Visual Interface (DVI), High-Definition Multimedia Interface
(HDMI), G igabit Video Interface (GVIF), or U nified Display Interface (UDI) connections, even if su ch cop ying would be permitted by
fair use law s. The specific ation is proprietary, and implem enting HDC P requires a license.
HDMI
HDMI (High-Definition Multimedia Interface) is a com pact audio/video interface for transferring uncompressed video data and com-
pressed/uncompressed digital audio data from a HDMI-compliant device ("the sour ce device") to a com patible computer monitor,
video projector, digital television, or digital audio device. HDMI is a digital replacement for existing analog video standards.
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