I'm trying to understand the underlying mechanisms that enable multiple smart speakers to stay in sync when playing the same audio stream. Specifically, how do they coordinate timing, handle network latency, and maintain consistent playback across rooms? Are there standard protocols or proprietary solutions? What are the trade‑offs?
How does multi-room audio synchronization work in voice assistants?
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I set up a pair of Echo speakers in my living room and bedroom, and I quickly learned they rely on a proprietary Wi‑Fi sync packet that includes a precise timestamp so each speaker knows exactly when to play the next audio frame, effectively hiding the few milliseconds of network latency. When the Wi‑Fi hiccups, they pause briefly and resync, which can cause a tiny glitch – the trade‑off being ultra‑low latency playback at the cost of occasional buffering to stay perfectly in sync.