LOUP Engineering: AEC & DSP · advanced
AEC Acceptance Should Include Double-Talk
A speakerphone must handle the user talking while the far end is also active.
The practical ownership question in AEC Acceptance Should Include Double-Talk was simple to state and harder to prove. Single-speaker echo tests are useful but incomplete because real calls include overlapping speech.
During double-talk the microphone contains local speech plus far-end leakage. An aggressive adaptive filter can mistake local speech for echo and distort the user, while a conservative filter may leave more residual echo. Acceptance therefore needs controlled overlap tests at several speaker volumes, not only silence-versus-far-end playback.
The debugging order stayed conservative: verify wiring and state transitions first, then tune performance only after correctness had been established. Evidence marker: aec-double-talk.
A voice algorithm should be tested in the conversational condition that is hardest for its assumptions. The broader result is a system that can be changed incrementally because each layer has a measurable responsibility and a known recovery path.
Project evidence
LOUP engineering marker: aec-double-talk. This note records the design or debugging lesson without publishing device credentials, private keys, customer data or manufacturing secrets.