Voice AI Architecture Expert

Build Voice AI Agents
That Actually Works.

Deep-dive into ASR, NLU, Dialog Management, NLG, and TTS. Explore architectures, code examples, and real-world implementations.

User Input
"What's the weather in DC?"
AI Response
"It's 25°C and sunny in DC"
Processing
🎤
🧠
🔊
124ms latency
Live Voice Processing
powered by Whisper + ElevenLabs
🎤 Audio Input → ASR → NLU → Dialog → NLG → TTS 🔊 Audio Output

The complete guide to building production-ready Voice AI agents — from architecture to deployment.

System Architecture

Voice AI System Architecture

The complete end-to-end pipeline powering modern voice assistants — from speech input to audio response.

voiceai.hub/architecture
By Wanjohi Christopher
Live
Voice AI System Architecture - End-to-End Pipeline by Christopher Wanjohi
ASR / STT NLU Dialog Manager NLG TTS
Explore each component
🎤
ASR/STT
Speech → Text
🧠
NLU
Intent + Entities
🔄
Dialog
State + Actions
✍️
NLG
Response Gen
🔊
TTS
Text → Speech
⚙️
Infra
Context + Tools

Supporting Infrastructure

Context Management • Knowledge & Tools • Personalization • Safety & Security • Evaluation

LLMs may span NLU, DM, and NLG in agent-based systems
System Architecture

Voice AI Pipeline Explained

Every voice assistant follows this 5-stage pipeline. Understanding each component is key to building great voice experiences.

voiceai.hub/dashboard
LIVE
Latency (p99)
124ms
12% vs last week
Success Rate
98.2%
2.4% improvement
Active Sessions
1,284
Real-time
Intents Detected
47
View all →

Live Pipeline Processing

"Book a flight to Paris"
🎤
ASR
45ms
🧠
NLU
32ms
🔄
Dialog
28ms
✍️
NLG
🔊
TTS
Intent: book_flight Entity: destination=Paris Confidence: 94.7%

The 5 Stages of Voice AI

Click each component to learn more about how it works.

ASR / STT

Automatic Speech Recognition converts raw audio into text using transformers like Whisper.

Whisper Deepgram AssemblyAI

NLU

Natural Language Understanding extracts intent and entities from transcribed text.

BERT GPT-4 Rasa

Dialog Manager

The brain of the system. Tracks conversation state and decides next actions.

LangGraph Rasa Core Dialogflow

NLG

Natural Language Generation crafts human-like responses using LLMs.

GPT-4 Claude Llama

TTS

Text-to-Speech converts text back to natural, human-like voice.

ElevenLabs Coqui XTTS

Infrastructure

Context management, APIs, databases, and real-time streaming.

Redis WebSockets FastAPI
Developer Experience

Build voice agents
with clean APIs.

Simple, intuitive interfaces for complex voice AI. Process speech, extract intent, and generate responses with just a few lines of code.

Type-safe APIs
Real-time streaming
Multi-language
Production ready
voice_agent.py
1  from voice_ai import Agent
2  
3  # Initialize the voice agent
4  agent = Agent(
5      asr="whisper-large",
6      nlu="gpt-4",
7      tts="elevenlabs"
8  )
9  
10 # Process voice input
11 response = agent.process(audio)
12 
13 print(response.text)
14 # → "Found 3 flights to Paris"
<250ms
End-to-end latency
99.2%
Intent accuracy
36+
Languages supported
OpenAI Whisper ElevenLabs Deepgram LangGraph GPT-4 Claude Coqui TTS AssemblyAI Rasa FastAPI OpenAI Whisper ElevenLabs Deepgram LangGraph GPT-4 Claude Coqui TTS AssemblyAI Rasa FastAPI
CW

Christopher Wanjohi

AI Engineer

Voice AI architect and agentic systems specialist. Leading the WAVE team at Catholic University's Multimodal AI Lab. AWS Community Builder.

Ready to build Voice AI?

Get in touch for collaborations, speaking engagements, or to chat about voice technology.