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LLM-1770
Installation and Operation Manual
91
LTC. Longitudinal Time Code, A SMPTE timecode standard usually recorded onto the linear
audio track of a VTR.
LU. Loudness Unit. The loudness unit is the scale unit of the loudness meter. The value of
the program in loudness units represents the loss or gain (dB) that is required to bring the
program to 0 LU, e.g. a program that reads -10 LU will require 10 dB of gain to bring that
program up to a reading of 0 LU. (From BS.1771)
LUFS. Loudness unit, referenced to Full Scale. (This is the EBU recommended unit;
equivalent to LKFS.)
Luminance. The degree of brightness (black and white portion of the video signal) at any
given point in the video image. A video signal is comprised of luminance, chrominance and
sync. If luminance is high, the picture is bright and if low the picture is dark. Changing the
chrominance does not affect the brightness of the picture.
Main Level. A range of allowed picture parameters defined by the MPEG-2 video coding
specification with maximum resolution equivalent to standard definition television.
Main Profile. A subset of the syntax of the MPEG-2 video coding specification that is
supported over a large range of applications. Applications include, MP@HL (Main profile at
high level) and MP@ML (Main profile at main level).
Mask/Preset Size. Uses the wipe pattern generator in the keyer portion of the effects
generator. This is used to adjust the size of a preset pattern or for adjusting the size of a
mask to block a portion of the key cut (source) from use in the keyer.
Matte Generator. An internal generator which can make any color, is used for border
color and may be used for key fill. It is identical to the Color Background Generator, but
simply used in other areas of the switcher.
Mbps. Megabits Per Second
mV. Millivolts
M/E. Mix/Effects System
MP@HL. Main profile at high level
MP@ML. Main profile at main level
MPEG. Refers to standards developed by the ISO/IEC JTC1/SC29 WG11, Moving Picture
Experts Group.
MPEG-2. Refers to ISO/IEC standards 13818-1 (Systems), 13818-2 (Video), 13818-3
(Audio), and 13818-4 (Compliance).
Multi-Level Effects. Applies to any effects generator which can do more than one effect
at a time. Typically, a multi level switcher can produce a Key and a Background transition in
the same effects generator at one time.
NTSC. National Television Systems Committee, the color television system used in the
United States, Canada, Mexico and Japan.
NVRAM. Nonvolatile RAM