MFPKEY_WMAAECMA_MIC_GAIN_BOUNDER Property
Specifies whether the Voice Capture DSP applies microphone gain bounding.
Constant for IPropertyBag
Available only by using IPropertyStore.
Data Type
VT_BOOL
Default Value
VARIANT_TRUE
Applies To
Remarks
Microphone gain bounding ensures that the microphone has the correct level of gain. If gain is too high, the captured signal might be saturated and will be clipped. Clipping is a non-linear effect, which will cause the acoustic echo cancellation (AEC) algorithm to fail. If the gain is too low, the signal-to-noise ratio is low, which can also cause the AEC algorithm to fail or not perform well.
This property can have the following values.
| Value | Description |
|---|---|
| VARIANT_TRUE | Enable microphone gain bounding. |
| VARIANT_FALSE | Disable microphone gain bounding. |
The default value of this property is VARIANT_TRUE (enabled).
Microphone gain bounding is applies only when the DSP operates in source mode. In filter mode, the application must ensure that the microphone has the correct gain level.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also
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