KSPROPERTY_AUDIO_MIC_SENSITIVITY

The KSPROPERTY_AUDIO_MIC_SENSITIVITY property specifies the microphone sensitivity in decibels relative to full scale (dBFS) units.

Note

KSPROPERTY_AUDIO_MIC_SENSITIVITY is deprecated starting with Windows 10 Version 1803. Use KSPROPERTY_AUDIO_MIC_SENSITIVITY2 instead.

Usage Summary Table

Get	Set	Target	Property descriptor type	Property value type
Yes	No	Pin Instance	KSP_PIN	LONG

The property value (operation data) is of type LONG and contains sensitivity information in decibels relative to dBFS units. The sensitivity value uses the following scale. The value uses fixed point decimal representation. The data is stored as a 16.16 fixed point value. The upper 16 bits are used for the whole number of the value and the lower 16 bits are used for the fractional portion of the value.

Return Value

A KSPROPERTY_AUDIO_MIC_SENSITIVITY property request returns a STATUS_SUCCESS upon successful completion of the request. Otherwise, the request returns an appropriate error status code.

Remarks

The audio driver can obtain microphone sensitivity for each microphone. This property allows this information to be retrieved from driver.

For Windows 10 voice recognition experiences such as Cortana to accurately detect and analyze user’s voice on various devices with different microphones, the OS needs to know certain characteristics of the input signal. Based on that information, the OS can calculate effective sensitivity and apply appropriate gain to enhance input signal. For more information, see Voice Activation.

KSPROPERTY_AUDIO_MIC_SENSITIVITY is available beginning with Windows 10, version 1607.

Requirements

Header

Ksmedia.h (include Ksmedia.h)