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Glossary
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Cross point
The intersection between an input and an output in the routing matrix.
Cross point cells are colored according to input type.
Cross point attenuation
The process of attenuating audio level at the cross point.
Audio can be attenuated from 0 to 60dB.
Decay Rate (slow, medium, fast)
Determines how fast a channel gates off after
hold time expires. Default is medium.
Default meter
The input/output displayed on the front panel LED meter when a
input/output meter is not specifically selected elsewhere.
Delay
A setting in the Processing window. Delay calculates the amount of signal
delay (up to 500ms) based on the distance between audio source and audience and
the temperature.
Device ID
A number which identifies the unit when multiple units of the same
device type are connected in an E-bus network. Because up to eight XAP 800s may
be used in the same network, the device ID range is 0–7.
Device Type
A number which identifies the type of unit. For example, a XAP 800
is device type 5.
DSP
Digital signal processor.
Echo Canceller Reference
The signal point which contains an electronic copy of
all signals which will be removed from the signal the mics pick up. This is always
the far-end audio and, optionally, local program material.
EC Reference summing
The ability to include multiple signals in a single
reference. See also Virtual Reference.
ERL
Found in the Acoustic Echo Canceller window, the echo return loss (ERL)
meter shows the coupling between the reference signal and the input to the echo
canceller—the ratio of the two levels.
ERLE
Found in the Acoustic Echo Canceller window, the echo return loss
enhancement (ERLE) meter shows the loss through the echo cancellation and non-
linear processing chain—the ratio of the two levels.
Expansion Bus
Consists of two RJ-45 connectors on the rear panel of the XAP
800. An Expansion Bus allows multiple XAP 800s to be networked together using
category five twisted-pair (10BaseT) cable.
Expansion Bus reference
One of the echo cancellation/PA adapt reference
options. The Expansion Bus reference allows you to reference an output on a
networked unit.