Intellimix Dsp; Dsp Best Practices; Acoustic Echo Cancellation - Shure MXA910 Manual

IntelliMix DSP

This device contains IntelliMix digital signal processing blocks that can be applied to the automix channel output. The DSP
blocks include:
• Acoustic echo cancellation (AEC)
• Automatic gain control (AGC)
• 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:
• Reduce speaker volume
• Position speakers farther from microphones
• Avoid pointing speakers directly at microphone coverage areas
Selecting a Reference Signal for AEC
To apply AEC, provide a far end reference signal. For best results, use the signal that also feeds your local reinforcement sys­
tem.
P300: Go to Schematic and click any AEC block. Choose the reference source, and the reference source changes for all AEC
blocks.
MXA910: Route a far-end signal to the AEC Reference In channel.
IntelliMix Room: Go to Schematic and click an AEC block. Choose the reference source. Each block can use a different refer­
ence source, so set the reference for each AEC block.
Designer's Optimize workflow automatically routes an AEC reference source, but it's a good idea to check that Designer choos­
es the reference source you want to use.
AEC Settings
Reference Meter
Use the reference meter to visually verify the reference signal is present. The reference signal should not be clipping.
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