Unverified60% confidenceFactExact time
Early 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.
2
Sources
60%
Confidence
Long-term
Relevance
7/15/2026
First Seen
Sources
Related Claims
VerifiedEarly voice assistants such as Siri and Alexa adopted a "speak–pause–respond" pipeline architecture, which is essentially half-duplex.82% similarUnverifiedTraditional 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.80% 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80% similarUnverifiedHalf-duplex systems use a strict serial pipeline of "voice activity detection (VAD) — recognition — generation — synthesis", so user pauses or inserted filler words may be misjudged as finishing speaking.79% similarUnverified早期语音AI系统受限于端点检测（VAD）技术，本质上是半双工架构79% similar
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