Verified80% confidenceFactExact time
Early voice assistants such as Siri and Alexa adopted a "speak–pause–respond" pipeline architecture, which is essentially half-duplex.
4
Sources
80%
Confidence
Long-term
Relevance
7/15/2026
First Seen
Sources
Related Claims
UnverifiedTraditional voice assistants such as early Siri and Alexa are all half-duplex designs, requiring users to wait for the system to finish speaking before continuing to provide input.85% similarUnverifiedEarly voice assistants such as Siri and Alexa used VAD (Voice Activity Detection) to determine whether the user had stopped speaking, a mechanism that is inherently half-duplex.82% similarUnverifiedMost previous voice assistants used a half-duplex mode, which was essentially a walkie-talkie-style turn-taking interaction that required waiting for the user to finish speaking before responding.77% similarUnverified早期语音AI系统如微软Cortana、亚马逊Alexa依赖VAD（端点检测）作为半双工架构，在嘈杂环境中脆弱77% similar
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