Dsp Best Practices; Acoustic Echo Cancellation - Shure MXA910 Manual

• Noise reduction
• Compressor
• Delay
To access the DSP blocks, select the IntelliMix tab. When enabled, each DSP block will be colored.
Selecting Bypass IntelliMix will bypass the following DSP blocks: AEC, AGC, noise reduction, compressor, and delay.

DSP Best Practices

• Apply DSP blocks only as needed. Run a test of your system without DSP, and then add processing as needed to fix any
issues that you hear in the audio signal.
• Unless you encounter video that lags behind audio, set Delay to off.
• DSP blocks do not affect whether the automixer gates a channel on or off.

Acoustic Echo Cancellation

In audio conferencing, a far-end talker may hear their voice echo as a result of a near-end microphone capturing audio from
loudspeakers. Acoustic echo cancellation (AEC) is a DSP algorithm which identifies the far-end signal and stops it from being
captured by the microphone to deliver clear, uninterrupted speech. During a conference call, the AEC works constantly to opti­
mize processing as long as far-end audio is present.
When possible, optimize the acoustic environment using the following tips:
• Avoid pointing speakers directly at microphones
• Reduce speaker volume
• Position speakers farther from microphones
Routing a Reference Signal to the AEC
To apply AEC, use Dante Controller to route a far­end reference signal to the AEC Reference In channel. Use a reference sig­
nal that is as close to your amplifier as possible.
AEC Settings
Reference Meter
Use the reference meter to visually verify the reference signal is present.
ERLE
Echo reduction loss enhancement displays the dB level of signal reduction (the amount of echo being removed). If con­
nected properly, the ERLE meter activity generally corresponds to the reference meter.
Reference
Indicates which channel is serving as the far end reference signal in Dante Controller.
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 double talk.
Medium: Use in typical rooms as a starting point. If echo artifacts appear, try using the high setting.
Shure Incorporated
45/59