Telex 38109-977 manual Light Signaling Limiter Line Line Level

ISO (Camera ISO)

ISO is a means for a keypanel operator to isolate a particular intercom port for private communication. While the intercom port is isolated, it can only hear audio from the keypanel operator. ISO is frequently used in television broadcasting to temporarily isolate a member of a camera Party-Line. The isolated camera operator can then receive directions without interference from other audio traffic on the Party-Line. ISOs are setup using the intercom system configuration software. Each ISO can also be given a name which is meaningful to keypanel operators. Once an ISO has been set up and named, it can be assigned to any keypanel key (provided that ISO assignment has not been restricted or disabled in the intercom system configuration software). For further information about ISOs, search for “ISO” in AZ™EDIT help.

J

K

k(kilo) metric prefix symbol for 1000.

K(Kilobyte) prefix symbol for 1024 (common usage). kilo A prefix meaning 1000.

L

LSymbol for inductance.

Lavaliere A small microphone. There are two types: 1) a very miniature type that clips onto clothing on the front of a performer below his head, and 2) a larger microphone on a cord worn around the neck of the performer with the microphone hanging below the neck on the chest.

Leakage The undesired leakage of a current or signal into another path.

Level The amplitude of power of a signal. If in decibels, the level has to be stated relative to a reference, and the reference has to be made clear.

Light Signaling

Limiter

Line

Line Level

Local Power Option

Loop-Through Loudspeaker

See Signaling. Accomplished on the intercom line, using DC levels (Clear-Com®, HME, Theatre Visions) or a 20 kilohertz tone (RTS™ Systems, Telex® AudioCom®).

An effective communications system needs to limit dynamic range to ensure adequate intelligibility to the listener. The limiter/compressor in the TW system user stations has three functions: I) It helps loud talkers and soft talkers to be heard equally well, 2) It prevents a loud voice from being severely distorted, 3) It keeps the voltage levels from exceeding system limits. Function 3 is important because the user station must operate over a wide range of power voltages, and the limiter makes a practical system possible.

A single communication path.

Line Level depends on the system and the reference. It is often used to differentiate microphone level (-40 to -60 dBu) and a higher level (often 0 dBu).

Local Power Source is a small AC converter that converts AC line power to low voltage in order to power a user station --a separate connector is provided. User stations usually get DC from the converter, although occasionally low voltage AC power is used.

See “Daisy Chain”.

A transducer that converts the electrical output of an amplifier to a audible sound.

M

mA

Main Station

Master Station

Shorthand for milliamperes or thousandths of an ampere.

A user station where a user station and a system power supply are combined into one package. A multichannel user station. There may be one or more of these stations in a system. Another definition is the primary station in a system.

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