Extron electronics DMP 64 User Manual page 32

FBS Settings Tab
The settings tab enables selection of the feedback suppressor parameters.
•
For Composite View show — content of the graph view is set by one of three radio
buttons,
• Only Dynamic FBS Filters
•
Only Fixed FBS Filters
•
Dynamic & Fixed FBS Filters (default)
•
Mode: Q — adjusts the notch filter Q used by dynamic filters. Similar to Q on the
parametric equalizers, Q changes the bandwidth of the filter. The default setting
can be modified in
Tools | Options
less change to the audio frequency response while lower values may provide greater
feedback suppression but with more possible impact to the tonal response of the
source audio.
Suggested values for specific applications are:
•
Q=7 (Voice with considerable feedback potential)
•
Q=30 (Voice with less feedback potential)
•
Q=65 (Music with minimal feedback potential)
• Attack Time — sets the time at which dynamic filters are generated after feedback
detection. A longer attack time (greater than 200 ms) reduces the chance that music
or audio content will trigger the dynamic filters to respond. A shorter attack time (less
than 2 ms) reduces the time between when feedback occurs and when it is detected
and suppressed.
• Hold Time — expressed in hours:minutes:seconds up to 9 hours. Hold time sets the
time a dynamic filter setting persists before the filter is cleared. When hold time is
disabled, dynamic filters persist indefinitely unless cleared manually or the device is
power cycled.
Hold time reverts to 00:00:00 when disabled (
Figure 22. FBS Settings Tab
. The range is from 5 to 65. Larger values provide
unchecked).
Enable
DMP 64 • Operation 26