User guide

Viz Engine Administrator’s Guide

IRE

Institute of Radio Engineers. Is now part of the IEEE .

IRE unit

An IRE unit is used in the measurement of composite video signals.

The range of a video signal is defined to be 1.0 volts peak to peak (p/p) which again

is divided into the picture and the synchronization portion of the signal. The picture

portion is defined as 0 IRE to 100 IRE. The synch portion is defined as -40 IRE to 0 IRE;

hence, the total range of IRE values is 140 units making each IRE unit equivalent to

1/140 volts.

Picture sources are typically set with black somewhere between 7.5 to 10 IRE. The

maximum signal brightness is usually set to just below 100 IRE.

A third signal, the burst signal, is present from +20IRE to -20IRE. It is a short sample

of the color subcarrier frequency, and is used to control how colors are displayed on-

screen.

LED

Light-emitting-diode.

Ligature

In writing and typography, a ligature occurs where two or more graphemes

(fundamental unit in a written language) are joined as a single Glyph .

Lip-sync

Lip-sync (short for lip synchronization) is a technical term for matching lip movements

with voice. The term refers to a technique in movie and broadcast production for

synchronization of visual and audio signals.

LTC

Linear TimeCode. See also VITC .

MCX

MCX connectors are coaxial RF connectors. They use a snap-on interface and usually

have a 50 Ohm impedance. They offer broadband capability from direct current (DC) to

6 GHz.

MDIF

Matrox Dongle Information File (.MDIF) can be generated and sent to Vizrt to upgrade

the Matrox X.mio video card to a higher class model.

MDUF

Matrox Dongle Upgrade File (.MDUF) is the file, provided by Vizrt, that will upgrade the

Matrox X.mio video card to a higher class model.

MMCX