Extron electronic Extron Electronics Music Mixer DMP 64 Manuale Utente

Feedback Suppressor (FBS)

The Feedback Suppressor is used in live situations when there is an indication of 
feedback during live operation. Dynamic filters automatically detect feedback on a 
live microphone channel, and engage a set of up to 5 fixed and 15 dynamic filters to 
counteract frequency peaks at the detected feedback frequency. Up to 15 separate filters 
can be employed at any time. The 15 filters act in a FIFO (first in, first out) rotation. If all 15 
filters are employed when an additional feedback frequency is detected, it overwrites the 
first detected feedback frequency and so on. 
To avoid a new feedback frequency overwriting a previously detected one, up to five of the 
dynamic feedback frequencies can be placed into fixed filters. Once written into the fixed 
filters, the feedback frequency can only be overwritten by the user manually writing a new 
frequency to the filter. 
The FBS dialog box has three tabs; 

, 

 and 

. 

Global settings and view options are controlled from the 

 tab. Dynamic to 

fixed filter allocations are handled from the 

 filters tab. Filter parameters can be 

modified from the 

 tab. 

The FBS Dialog box provides the following global buttons: 

•

Clear All — Clears all dynamic filter settings.

•

Lock — Locks the dynamic filters to the current settings, preventing automatic 
updates. This temporary mode is useful while testing the system, or during the time 
when dynamic filters are being converted to fixed filters. When the FBS display 
window is closed, lock mode is automatically disengaged.

•

Bypass FBS — Turns off feedback detection when engaged (button is red). Only the 
dynamic filters are bypassed. Fixed filters remain active.

•

Set Defaults — Click once to return the FBS to default settings.