kAUVoiceIOProperty_MutedSpeechActivityEventListener
A property to register a listener that the system calls when it detects speech while the user has the microphone muted.
Declaration
var kAUVoiceIOProperty_MutedSpeechActivityEventListener: AudioUnitPropertyID { get }Discussion
To use this API, your app must implement mute using the kAUVoiceIOProperty_MuteOutput property.