Why Live Interpretation Brings Back Echo in Meetings and How Capture-Side Echo Cancellation Helps

Adding live interpretation to a meeting can reintroduce echo that the meeting app had already suppressed. The cause is that the translated speech is played through speakers and picked up again by the microphone, while the echo canceller may only have a reference for the original audio. Because the translation is a separate utterance with different timing and waveform, the cancellation process can miss it. Echo can also come from audio routing loops, such as loopback capture or shared virtual cables, which bypass the air path entirely. The article argues that such problems usually stem from new audio paths falling outside the original processing scope rather than from a failure of the meeting app itself.