Node.js voice agent with AssemblyAI Universal-3.5 Pro Realtime
Blog post from AssemblyAI
This tutorial provides a comprehensive guide on building a real-time voice agent in Node.js using the AssemblyAI Universal-3.5 Pro Realtime model for speech-to-text, without the need for Python or heavy framework dependencies. The setup includes two modes: a terminal agent that uses mic input and plays TTS audio in the terminal, and a browser server utilizing Node.js WebSocket with a user interface. The AssemblyAI model offers features like punctuation-based turn detection, context carryover, and mid-session keyterm prompting, enhancing the transcription process and eliminating the need for a separate VAD library. The tutorial emphasizes the model's efficiency in handling real-time conversations with low word error rates (WER) and provides detailed instructions on connecting to the AssemblyAI WebSocket, streaming audio, and fine-tuning turn detection. It also highlights the ability to update conversation context and keyterms mid-session without needing to restart the connection, thereby optimizing the real-time voice agent's functionality.
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