Noise Reduction; Automatic Gain Control (Agc) - Shure MXA910 Manual

ERLE
Echo return loss enhancement (ERLE) displays the dB level of signal reduction (the amount of echo being removed). If the
reference source is connected properly, the ERLE meter activity generally corresponds to the reference meter.
Reference
Indicates which channel is serving as the far end reference signal.
Non-Linear Processing
The primary component of the acoustic echo canceller is an adaptive filter. Non-linear processing supplements the adaptive
filter to remove any residual echo caused by acoustic irregularities or changes in the environment. Use the lowest possible
setting that is effective in your room.
Low: Use in rooms with controlled acoustics and minimal echoes. This setting provides the most natural sound for full du­
plex.
Medium: Use in typical rooms as a starting point. If you hear echo artifacts, try using the high setting.
High: Use to provide the strongest echo reduction in rooms with bad acoustics, or in situations where the echo path fre­
quently changes.

Noise Reduction

Noise reduction significantly reduces the amount of background noise in your signal caused by projectors, HVAC systems, or
other environmental sources. It is a dynamic processor, which calculates the noise floor in the room and removes noise
throughout the entire spectrum with maximum transparency.
Settings
The noise reduction setting (low, medium, or high) represents the amount of reduction in dB. Use the lowest possible setting
that effectively lowers noise in the room.

Automatic Gain Control (AGC)

Automatic gain control automatically adjusts channel levels to ensure consistent volume for all talkers, in all scenarios. For qui­
eter voices, it increases gain; for louder voices, it attenuates the signal.
Enable AGC on channels where the distance between the talker and the microphone may vary, or in rooms where many differ­
ent people will use the conferencing system.
Automatic gain control happens post-gate (after the automixer), and will not affect when the automixer gates on or off.
Target Level (dBFS)
Use -37 dBFS as a starting point to ensure adequate headroom, and adjust if necessary. This represents the RMS (aver­
age) level, which is different from setting the input fader according to peak levels to avoid clipping.
Maximum Boost ( dB)
Sets the maximum amount of gain that can be applied
Maximum Cut ( dB)
Sets the maximum attenuation that can be applied
Tip: Use the boost/cut meter to monitor the amount of gain added or subtracted from the signal. If this meter is always reach­
ing the maximum boost or cut level, consider adjusting the input fader so the signal is closer to the target level.
Shure Incorporated
44/59