Extron Electronics DMP 64 User Guide - Manual (Page 48)

FBS Settings
The Settings tab enables selection of the feedback suppressor parameters.
• For Composite View show: — The graph view is set by one of three 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 the
parametric filter Q, it changes the bandwidth of the filter. The default setting can be
modified in
Tools>Options . The range is from 5 to 65. Larger values provide less
change to the audio frequency response while lower values can provide greater
feedback suppression but with more impact to the tonal response of the source
audio.
Suggested values for specific applications are:
Q Value Application
7 Voice with considerable feedback potential
30 Voice with less feedback potential
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 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 (
Enable unchecked).
Figure 33. FBS Settings Tab
DMP 64 • Software Control 42