TS3 pre-processes the microphone with WebRTC's audio processing module.
AudioProcessor ports the stages it enables, in APM's order, per 10 ms at
48 kHz:
- The high-pass filter APM forces on with noise suppression, then the
three-band split and WebRTC's noise suppressor at TS3's four levels.
- The transient suppressor behind "Typing attenuation", which only acts
while it is told about key presses.
- AGC2 adaptive digital, WebRTC's successor to the AGC1 that TS3 runs.
The tests compare against 16-bit outputs of upstream APM builds
(webrtc-audio-processing 2.1, and 1.3 for the transient suppressor).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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