T
Talent
Talk Level 1
Talk Level 2
Tally
Telco
Tone Signaling
Transducer
Transformer
Transient
Transient
Intermodulation
Distortion
Transient
Response
Trunking
Balanced
Unbalanced
Unbalanced
Line
Collective name for all performers and actors who appear regularly on television.
Talk level 1 is the normal talk key assignment. This is the assignment that normally appears in the alphanumeric display (on keypanels so equipped). You may add a talk level 2 assignment to activate a second device along with talk level 1.
Talk level 2 is used with stacked talk keys. A stacked talk key activates two types of communication at once. For example: a stacked talk key could simultaneously activate audio output to a transmitter and key the transmitter using a relay. The audio output is called the level l assignment and the relay is called the level 2 assignment.
An intercom’s tally usually identifies a calling party to a called party, tally can also indicate a call waiting.
Abbreviation for Telephone Company. Refers to communication lines owned and operated as part of a standard telephone system.
An audio tone distributed on the intercom line (may be associated with light signaling). This tone is often used for alerting an operator.
In sound, a device that converts acoustic energy to electrical (e.g.: microphone) or vice versa
(e.g.: loudspeaker).
Audio transformer: a device that can isolate two circuits, and, in addition, match impedances, step up or down voltages or currents. A microphone transformer can be used to optimize the signal to noise ratio of a microphone preamplifier combination. Power transformer: a device that isolates electronic circuitry from a direct connection with the power line, and provides power at a convenient voltage for the electronic equipment (usually rectified and filtered first).
In acoustics, a sudden change such as that from a percussive instrument (drum or piano). In electronics, a sudden change such as a stepped signal or spiked signal.
See Distortion.
Equipment needs to be designed to be damage proof from power line transients. Good audio equipment needs to handle well signal transients that occur normally. Transient handling may require headrooms of 20 to 60 decibels. The headphone amplifiers used in RTS™ Systems intercoms generally have good transient handling capability.
Trunking is a method of interconnecting two or more independent intercom systems. The connection is accomplished by reserving one or more audio ports in each of the intercom systems for use as audio links between the systems. A special device, called a Trunking Master Controller, is required to control access and usage for the trunked intercom ports. A configuration utility, called CStrunk, is used to set up the Trunking Master Controller.
A communications system where the path is the same for both talk and listen. In electrical pathways there are, in fact, two wires (one path).
A
A communications line that uses circuit common or “ground” as a return path. In the case of intercom systems, in general, an unbalanced line is more susceptible to noise interference. But practically speaking, a low impedance unbalanced line (200 ohms) works well in the real world, and has the added advantage of being able to operate on just two wires, carrying the DC power, the full duplex audio signal, the 20.000 kilohertz call light signal, and the 24.000 kilohertz microphone reset signal. Many installations have been previously wired for telephone operation and the two wire intercom works on these pairs. A special “golf’ system application of the TW System has the advantages of the TW system and balanced line operation. A standard TW power
