Filter
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Glossary
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
400. An Expansion Bus allows multiple XAP 400s 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.
Filter
A device that passes and blocks audio signals based on user-definable
requirements of the system.
• All Pass A filter that provides only phase shift or phase delay without
appreciably changing the magnitude characteristic. The filter produces a flat
amplitude response. It is useful for matching the delay of two processing
channels with different delays.
• High Pass A filter that passes high signal frequencies while attenuating low
frequencies. The gain or loss
• High Shelving Provides boosting or attenuation of frequencies above a
designated frequency. The transition between the spectrum above and below
the designated frequency occurs at a fixed 6dB/octave rate. The gain or loss
above the corner frequency is adjustable to +/- 15dB.
• Low Pass A filter that passes low frequencies while attenuating high
frequencies.
• Low Shelving Provides boosting or attenuation of frequencies below a
designated frequency. The transition between the spectrum above and below
the designated frequency occurs at a fixed 6dB/octave rate. The gain or loss
below the corner frequency is adjustable to +/- 15dB.
Filter Display
A group of nodes plotted on a logarithmic scale. The
XAP 400’s filter display can be accessed through the Inputs 1-8, From Processing,
or To Processing windows.