Unverified50% confidenceTradeoffExact time
三明治架构相比原生Speech-to-Speech多了两次转换环节，STT环节通常增加100-300毫秒，TTS环节增加100-200毫秒
1
Sources
50%
Confidence
Long-term
Relevance
8/18/2026
First Seen
Sources
Related Claims
UnverifiedSTT、LLM、TTS三段串行叠加，仅处理延迟就超过650毫秒，不包括服务间网络跳转耗时78% similarUnverified业界领先的STT实时转录延迟约在200-400毫秒，采用Whisper或DeepSpeech等模型76% similarUnverifiedThe cumulative latency of a traditional ASR→LLM→TTS three-stage pipeline is typically between 800 milliseconds and 2 seconds.75% similarUnverifiedIn the end-to-end latency of voice agents, STT typically takes 200–500 ms.74% similarUnverifiedCloud TTS services typically have a time-to-first-byte of 200–500 milliseconds, while locally deployed lightweight TTS models (such as Piper and Kokoro-82M) can reduce latency to under 50 milliseconds, though audio quality is generally slightly lower.72% similar
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