Agora voice agent with AssemblyAI Universal-3 Pro Streaming

Agora's voice agent integration with AssemblyAI Universal-3 Pro Streaming enables real-time transcription in Agora channels with minimal client-side changes. By utilizing a Python server as a silent observer, raw PCM audio from channel participants is streamed directly to AssemblyAI's WebSocket, achieving speaker-aware transcripts with a latency of 307ms P50. This setup leverages Agora's server-side bot capabilities to subscribe to participant audio and forward PCM streams to AssemblyAI, which processes them without the need for resampling. The integration provides significant improvements over Agora's built-in speech-to-text features, offering lower latency, better word error rates, and real-time speaker diarization across 99+ languages. The system architecture involves configuring the Agora channel for mono audio output at 16 kHz and setting up a websocket connection to stream participant audio frames to AssemblyAI, which in turn sends back transcript events for application logic or further processing.

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