AVAudioSessionModeVoiceChat
Learn about AVAudioSessionModeVoiceChat.
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To enable platform acoustic echo cancellation (AEC), the iOS device must be in
AVAudioSessionModeVoiceChatAVAudioSessionModeVoiceChat참고
Although it is possible to change the AVAudioSession mode to default after activating the Voice-Processing I/O unit, Apple recommends using AVAudioSessionModeVoiceChat. Using the default mode when the Voice-Processing I/O unit is active might cause unpredictable behavior, and various device types (for example, iPad and iPhone) might behave in different ways.