CMN-91
Appendix C
Installation and Operation Manual
Glossary
© 2016 Imagine Communications Corp. Proprietary and Confidential.
Revision D | Page 185
Key Fill In a key effect, this is the video which is used to replace the portion of background video which
was removed. This may be the same video as the Key Cut video.
Key Invert In a key effect, this is an electronic action which reverses the polarity of the key cut signal. It
makes black appear as white, and white appear as black.
Key Mask In a key effect, it uses a wipe pattern from the wipe pattern generator to restrict the key cut
from removing video in a portion of the screen. This requires the use of the wipe pattern generator and
the Mask/Preset Size controls.
Key Source Another term which is the same as key cut.
Legalization The modification of serial digital video to conform to analog color space rules, as required
by users.
LCD Liquid Crystal Display
LED Light-Emitting Diode
LFE Low Frequency Effects
Lissajous A display of the amplitude and phase relationships between two input signals.
LKFS Loudness, K weighted, relative to nominal full scale. The LKFS unit is equivalent to a decibel in that
an increase in the level of a signal by 1 dB will cause the loudness reading to increase by 1LKFS. A unit of
LKFS is equivalent to a decibel.
If a 0 dB full-scale 1 kHz sine wave is input applied to the left, centre, or right channel input, the
indicated loudness will equal -3.01 LKFS. The weighting coefficients are different for each channel.
LS Left Surround
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 (see mailto:mp@hl - mailto:mp@hl) (Main
profile at high level) and MP@ML (Main profile at main level).
