MFPKEY_WMAAECMA_FEATR_ECHO_LENGTH Property
Specifies the duration of echo that the acoustic echo cancellation (AEC) algorithm can handle, in milliseconds.
Constant for IPropertyBag
Available only by using IPropertyStore.
Data Type
VT_I4
Default Value
256
Applies To
Remarks
The AEC algorithm uses an adaptive filter whose length is determined by the duration of the echo. It is recommended that applications use one of the following values:
- 128
- 256
- 512
- 1024
The default value is 256 milliseconds, which is sufficient for most office and home environments. Before setting this property, you must set the MFPKEY_WMAAECMA_FEATURE_MODE property to VARIANT_TRUE.
The DSP uses this property only when AEC processing is enabled.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also