AS3460
Wind Noise Detection
Demo Kit Manual
• PUBLIC
UG000480
• v3-00 • 2021-Nov-08
126
│ 124
“Wind Detection Attack Time”
This governs the attack time of the wind noise metric. It is recommended to keep it low for quick
responses. This does not control the gain adjustment rate, just the metric ramp up time of
WIND_NOISE_METRIC
in the presence of possible wind.
“Wind Detection Decay Time”
This governs the decay time of the wind noise metric. It is recommended to keep it much longer in
comparison to the attack time, to help smooth out the overall response and subsequent mitigation
actions. This does not control the gain adjustment rate, just the metric ramp down time of
WIND_NOISE_METRIC
in the absence of possible wind.
“Gain Suppression Rate”
This sets the maximum rate at which gain suppression can take place (i.e. if the wind metric instantly
changed from 0 to requiring maximum wind suppression). It is effectively a speed limit, recursively
applied to the current gain at a rate of 12 kHz. Decrease the value for faster attenuation, or increase
towards 1.0 for slower attenuation. A value of 1.0 provides no attenuation. Note that this only affects
how quickly the gain will respond to rapid increases in the current wind level, as observed in runtime
register
WIND_NOISE_METRIC
.
15.4
Parameters
Low/High Wind Threshold:
Once the wind metric is above the low threshold the wind noise suppression will activate and cap the
FB/FF gains to a lower value. When the wind metric reaches the high threshold then this cap value is
the max suppression value defined by the user.
Attack/Release Time:
These are applied to the wind metric. Longer times will smoothen transitions.
Gain Suppression Rate:
Is the factor applied to the FB/FF gains during the transition from current gain value to the capped
target value. Smaller means faster ramping.
Wind Detection Noise Floor:
FF signal energy is checked, if it is below this value then the wind metric is set to 0 to avoid false
positives.
Wind Detection Sensitivity:
Scaling factor for the wind metric. A value of 200% will multiply the wind metric by a factor of 2.
Preset X Fully Suppressed Gain:
Maximum gain reduction that will be applied when the wind metric exceeds the high wind threshold.
This parameter can be set individually for each preset. A value of 0 means that the FF/Voice gains will
be muted, a value of 0.5 means that the FF/Voice gains will be attenuated by -6dB.
