VC - AEC Input 8 Channel


NEXIA VC hardware is represented in the Layout with as many as seven separate blocks. Between these blocks can be placed virtually any of the other available NEXIA mixing, routing, and processing blocks (component objects). Like other component objects, NEXIA VC blocks can be placed into the Layout either from the Processing Library or from the Object Toolbar. To access VC – AEC Input 8 Channel settings, double-click over the corresponding block in the Layout. This opens a Control Dialog Box which provides all available settings.





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 (dB) 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. Noise Reduction 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. Ref, Mic, and Out display levels at the AEC Ref block and at the AEC block (pre & post AEC respectively). Echo Detect indicates AEC in progress. Echo Path Changed indicates AEC converging. Min Threshold prevents AEC re-convergence due to momentarily low levels (such as muted mics).


Right-clicking over certain settings will provide a menu of additional options.


Each NEXIA VC comes pre-configured from the factory with a default system design. If you wish to load your own custom designed configuration you will need to reset/initialize the unit(s) first.