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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/kaudiounitsubtype_voiceprocessingio
An audio unit that interfaces to the audio inputs and outputs of iOS devices and provides voice processing features. Availability. iOS 10.0+. iPadOS 10.0+. macOS 10.12+. Mac Catalyst 13.0+. tvOS 10.0+. Framework.
Apple's Voice Processing Audio Unit ( …
https://stackoverflow.com/questions/12821404/apples-voice-processing-audio-unit-kaudiounitsubtype-voiceprocessingio-brok
I tried to use the built-in echo-suppression by switching to using a kAudioUnitSubType_VoiceProcessingIO unit. This works really well on iOS 6 (iPad 3), but the same code on iOS 5.1 (iPad 2) produces white noise on the microphone input. The documentation just mentions that it should be available in iOS 3.0 and later.
Possible to use kAudioUnitSubType_VoiceProcessingIO …
https://developer.apple.com/forums/thread/97465
let audioComponentDescription = AudioComponentDescription(componentType: kAudioUnitType_Output, componentSubType: kAudioUnitSubType_VoiceProcessingIO, componentManufacturer: kAudioUnitManufacturer_Apple, componentFlags: 0, componentFlagsMask: 0) AVAudioUnit.instantiate(with: audioComponentDescription, options: …
Using Audio - Apple Developer
https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/MultimediaPG/UsingAudio/UsingAudio.html
The Voice Processing I/O unit, of type kAudioUnitSubType_VoiceProcessingIO, has the characteristics of the I/O unit and adds echo suppression and other features for two-way communication. Generic Output unit
iOS WebRTC中AVAudioSession - 简书
https://www.jianshu.com/p/5addd678c64e
iOS WebRTC中AVAudioSession. 收藏点赞文章： iOS 音频-AVAudioSession iOS音频掌柜-- AVAudioSession. 在WebRTC应用中，AudioUnit 使用的是Voice-Processing I / O unit (subtype kAudioUnitSubType_VoiceProcessingIO)，使用内置的aec和agc等功能， AVAudioSession状态：
AVAudioEngineでエコキャン実装 (with ManualRendering) | skyplace
https://soranoba.net/programming/voice-porocessing-with-avaudioengine
@constant kAudioUnitSubType_VoiceProcessingIO - Available on OS X and with iOS 3.0 or greater This audio unit can do input as well as output. Bus 0 is used for the output side, bus 1 is used to get audio input (thus, on the iPhone, it works in a very similar way to the Remote I/O).
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