User Manual
Table Of Contents
- Contents
- An overview of MRX Designer
- Screen structure
- Basic use of MRX Designer
- Menu bar
- Tool buttons
- Shortcut keys
- Design sheet
- “Parameter Sets” area
- “Parameter Link Group” area
- “Gang Edit Group” area
- “Properties” area
- Components and the component editor
- Editing the parameters
- Acoustic Echo Canceller (AEC)
- Ambient Noise Compensator (ANC)
- Audio Detector
- Auto Gain Controller (AGC)
- Combiner
- Delay
- Dynamics
- Effect
- EQ
- Fader
- Feedback Suppressor
- Filter
- Inputs/Outputs
- Meter
- Mixer
- Oscillator
- Paging
- Polarity
- Revolabs Control
- Router
- Source Selector
- Speaker Processor
- Speech Privacy
- Text
- Transmitter/Receiver
- User Defined Block
- Dialog boxes and applications
- “Print” dialog box
- “Install Speech Privacy File” dialog box
- “File Transfer” application
- “PGM1 Label Creator” application
- “Compile” dialog box
- “Snapshot Group” dialog box
- “Remote Control Setup List” dialog box
- “External Events” dialog box
- “GPI” dialog box
- “Digital Control Panel” dialog box / “Wireless DCP” dialog box / “MCP1” dialog box
- “PGM1/PGX1” dialog box
- “Port Name” dialog box
- List of settings in “Settings” dialog boxes
- Context menus
- Troubleshooting
Acoustic Echo Canceller (AEC)
MRX Designer User Guide
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❑ Acoustic Echo Canceller (AEC)
Acoustic Echo Canceller (AEC) is a function that eliminates the acoustic echo that can be a problem
during remote conferencing when sound from a speaker is picked up by microphones or reflected
from a wall, or steady-state noise such as produced by air conditioning systems. By providing the
other party with clear audio from which such echo and noise have been removed, conversation
during the remote conference can be conducted smoothly.
In order to eliminate acoustic echo that originates with the other party, the other party must also be
equipped with a system that provides an acoustic echo canceller function.
The MRX7-D can provide up to eight channels of AEC per unit.
The following amount of delay is added to a signal path in which the AEC component is placed.
When word clock is 44.1 kHz: 26.17 msec
When word clock is 48 kHz: 24.02 msec
The AEC inputs are as follows, starting from the top.
• MicIn 1: Input from mic
• MicIn 2: Input from mic
• Reference: Input for the signal that you do not want transmitted to the remote location (signal that
is considered as echo, and is to be removed) (e.g., Codec In)
Use mics from the same conference room as the input to MicIn 1 and MicIn 2.
■ “AEC” editor
Here you can make settings related to AEC. In the left side of the screen, make settings for
the mic connected to MicIn 1; in the right side of the screen, make settings for the mic
connected to MicIn 2.
1 AEC [ON] button
Switches the AEC function between enabled and disabled.
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