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
Feedback Suppressor
MRX Designer User Guide
78
❑ Feedback Suppressor
The Feedback Suppressor (subsequently referred to as FBS) is a function that prevents the unpleasant
acoustic feedback that occurs when sound from a speaker is picked up by a mic and re-amplified. In
addition to being unpleasant, acoustic feedback places a strain on the speakers, and can damage
them. To prevent such feedback, place the speakers so that their sound will not be picked up by the
mic and amplified. If acoustic feedback still occurs, you can use FBS to improve the feedback margin.
The MRX can provide two types of FBS: Notch FBS and Pitch Shift FBS.
Notch FBS uses a notch filter to lower the level of the feedback point.
Pitch Shift FBS slightly shifts the pitch of the frequency point that is feeding-back, thereby ending
the feedback loop.
Up to eight Notch FBS units can be placed in an MRX unit.
“Notch FBS” component editor
FIXED
After the speakers and mics have been installed, and while the MRX settings are being
made, this method proactively finds feedback points in the current sound system, and
applies the appropriate filters. This is effective for mics whose position is fixed.
1 FIXED [ON] button
Switches the detection result between enabled and disabled.
2 [DETECT] button
Starts or stops detection. This is available only when online. Detection does not end
automatically. During detection, the DYNAMIC filtering is disabled. For details on the
detection procedure, refer to Performing FBS detection for the FIXED type.
3 [CLEAR] button
Clears the filter settings.
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2
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