Noise Reduction; Automatic Gain Control (Agc); Delay - Shure MXA901-R Manual

Reference
Non-Linear Processing

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 does 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 (not available on all microphones) to monitor the amount of gain added or subtracted from the
signal. If the meter is always reaching the maximum boost or cut level, adjust the input fader so the signal is closer to the target
level.

Delay

Use delay to synchronize audio and video. When a video system introduces latency (where you hear someone speak, and
their mouth moves later), add delay to align audio and video.
Indicates which channel is serving as the far end reference signal.
The primary component of the acoustic echo canceller is an adaptive filter. Non­linear pro­
cessing supplements the adaptive filter to remove any residual echo caused by acoustic ir­
regularities 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 duplex.
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 situa­
tions where the echo path frequently changes.
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