Glossary - Barco Athena User Manual

GLOSSARY

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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 first revision of the standard, SMPTE 259M, was defined to carry digital representation of analog
video such as NTSC and PAL over a serial interface and is more popularly known as standard-definition (SD) 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 commonly called the HD SDI
interface and is defined 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 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 required
for 1080p and digital cinema.
Digital Cinema Initiatives (DCI)
DCI is a joint venture of Disney, Fox, Paramount, Sony Pictures Entertainment, Universal and Warner Bros. Studios. DCI's primary
purpose is to establish and document voluntary specifications 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 Picture 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 SMPTE DCP
standards. A copy of the most recent DCI specification can be downloaded from the DCI website (http://dcimovies.com).
Digital Cinema Package (DCP)
A Digital Cinema Package (DCP) is a collection of digital files used to store and convey Digital Cinema (DC) audio, image, and data
streams. The term has been defined by Digital Cinema Initiatives (DCI). General practice adopts a file structure that is organized into
a number of usually multi-gigabyte size Material eXchange Format (MXF) files, 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 amount of required storage and to protect from unauthorized use. The image part is JPEG 2000 com-
pressed, whereas the audio part is linear PCM. The adopted (optional) encryption standard is AES 128 bit in CBC mode. The newer
SMPTE standards are used to conform the recommendations among different tool vendors and producers. Interop, the legacy DCP
standard, is still required to be supported by DCP players.
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 fitted video sources without replacing existing display devices.
HD
Light beam Hazard Distance (HD) is the distance from the source at which the intensity or the energy per surface unit becomes
lower than the applicable safety limit. The light beam can thus be considered as dangerous if the operator is closer from the source
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-Definition Multimedia Interface
(HDMI), Gigabit 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 HDCP requires a license.
HDMI
HDMI (High-Definition 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.
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Glossary
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