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FBS Settings Tab
The settings tab enables selection of the feedback suppressor parameters.
• For Composite View show: — 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. The range is from 5 to 65. Larger values provide
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 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 (checkbox cleared) dynamic filters persist indefinitely unless cleared manually
or the device is power cycled.
Figure 38. FBS Settings Tab
DMP128 • Software Control 67