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Biamp LTR User Manual

Page 105

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Component Objects

In applications where only background noise reduction is desired, AEC can be turned off and no
AEC Ref connection is required. Noise Reduction is intended for 'stationary' or steady-state
background noises, such as from HVAC systems, fans, motors, or other mechanical devices.

Device IO

indicates which hardware input is associated with that software channel. Gain In

compensates for different input levels (mic or line), and should be set so Peak In flashes only
occasionally (6dB headroom). Phan Pwr assigns +48 Volt phantom power to the input for
condenser microphones. Mute In turns the input signal on/off. Level In adjusts the relative input
volume. Invert In reverses the polarity of the input signal. AEC turns on/off acoustic echo
cancellation. Adv opens an Advanced dialog. NR In selects the amount of background noise
reduction to be applied (6~15dB).

Each channel of AEC has an Advanced dialog
box. ERL (Echo Return Loss) shows the level
difference between a signal at the speaker output
(AEC Ref) and that same signal as picked up at
the mic (AEC Input). ERLE (Echo Return Loss
Enhancement) indicates the amount of
processing being applied on that channel. TER
(Total Echo Reduction) shows the combined
echo reduction achieved by acoustic damping
(ERL) and signal processing (ERLE). Nonlinear
Processing

provides additional echo

cancellation, for more challenging applications.
However, increased Nonlinear Processing can
also adversely affect full-duplex operation.

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