Voice AI Architecture Series

Master the Art of
Voice AI Systems

Deep-dive into ASR, NLU, Dialog Management, Memory, NLG, and TTS. Then learn how to build production-ready Voice AI Agents.

User Input
"Book a flight to Paris for tomorrow"
AI Response
"Found 3 flights to Paris. The earliest departs at 8:45 AM..."
Pipeline
Audio input Audio input Audio input ✍️ Audio input
127ms e2e
System Architecture

Voice AI System Architecture

The complete end-to-end pipeline. This is what powers every voice assistant.

voiceai.wanjohichristopher.com/architecture
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Voice AI Complete Architecture
ASR NLU Dialog NLG TTS
Component Deep Dives

All Architecture Diagrams

Every component broken down with detailed architectures.

Day 2

ASR — Speech to Text

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ASR Architecture

Audio preprocessing → Feature extraction (Mel spectrograms) → Encoder-Decoder Transformers → Decoding

Day 3

NLU — Natural Language Understanding

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NLU Architecture

Intent Classification → Entity Extraction (NER) → Slot Filling → Confidence Scoring

Day 4 Part 1

Dialog Management — Core Pipeline

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Dialog Management

State Tracker → Dialog Policy → Action Selection → Multi-turn Management

Day 4 Part 2

Context & Memory Management

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Context Memory

Short-term (session) → Long-term (user) → RAG Integration → Context Window Strategies

Day 5

NLG — Natural Language Generation

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NLG Architecture

Content Planning → Sentence Planning → Surface Realization → Templates vs LLMs

Day 6

TTS — Text to Speech

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TTS Architecture

Text Analysis → Prosody → Acoustic Model (Tacotron/VITS) → Vocoder (HiFi-GAN)

OpenAI Whisper ElevenLabs Deepgram LangGraph GPT-4 Claude Coqui TTS Rasa FastAPI Redis Pinecone OpenAI Whisper ElevenLabs Deepgram LangGraph GPT-4 Claude Coqui TTS Rasa FastAPI Redis Pinecone
See It In Action

Real-Time Voice
Conversations

Speech-to-speech in under 200ms. Natural conversations powered by the complete Voice AI pipeline.

Real-time ASR
Context-aware
Natural TTS
Voice Assistant
Listening...
9:41
"What's on my calendar today?"
9:40
"You have 3 meetings. First one is a standup at 10 AM..."
9:40
"Reschedule the standup to 11"
9:41
From Architecture to Application

Voice AI → Voice AI Agents

The architecture is the foundation. Agents are what you build with it.

🎙️

Voice AI

The Pipeline

+ Agency
🤖

Voice AI Agent

Autonomous System

Tools Memory Actions
Tool Use
APIs, databases
Reasoning
LLM decisions
Memory
Cross-session
Orchestration
Multi-agent
Voice AI Agent

Voice AI Agents - Coming Soon

Building production-ready Voice AI Agents using the architecture above. Multi-agent systems with LangGraph, real-time ASR, and natural TTS.

CW

Christopher Wanjohi

AI Engineer & Voice AI Specialist

Senior Data Engineer & AI Specialist at Catholic University of America. Leading the WAVE team at the Multimodal AI Lab. AWS Community Builder. Apache Airflow Certified.

Ready to Build Voice AI?

Get in touch for collaborations, consulting, or to discuss voice technology.