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AIIT-Threshold/
voice2

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voice2

A full-duplex, interruptible voice engine for local AI, built and run daily as the voice of a fully local companion before being extracted for release. Plain Python threads, CPU-only defaults, no cloud, no API keys. Talk to your model — and talk over it.

voice2 turns any callable(text) -> str into a hands-free voice conversation: mic → Silero VAD → faster-whisper ASR → your model → Piper TTS. Speak over the reply (or tap spacebar) and playback stops mid-chunk in ~100–200 ms, exactly like interrupting a person.

Code is mirrored on GitHub: https://github.com/AIIT-GLITCH/voice2

Engine details

What it is: a turn-taking state machine, not a demo loop. Explicit states (IDLE → LISTENING → THINKING → SPEAKING → INTERRUPTING), a validated transition table, and a FloorOwner (USER / AGENT / NONE) that arbitrates who may speak. The agent can never talk over you.
Barge-in: a fast energy-gated VAD watches the mic only while the engine is speaking; a debounced central InterruptController also accepts spacebar and programmatic triggers.
Stale-turn suppression: every utterance gets a turn_id; replies to an abandoned turn are discarded at every stage (think, TTS, playback).
Invariants, enforced: a background checker audits rules like SPEAKING ⇒ floor == AGENT and interrupted ⇒ no new TTS, with forced repair plus a structural gate in the playback hot path.
Observability: every event is a JSON line with per-turn latency marks (asr_ms, think_ms, interrupt_stop_ms, total_turn_ms).
Degrades gracefully: no mic → text mode; TTS missing → silent replies, still logs; keyboard hook fails → engine keeps running.

Backends

Stage	Default	Swap point
VAD (quality gate)	Silero VAD via `torch.hub`	`ListenWorker`
ASR	faster-whisper `small.en`, int8, CPU	`backends/asr.py` (Protocol)
LLM	any `callable(text) -> str`	`backends/llm.py`
TTS	Piper CLI, any `.onnx` voice	`backends/tts.py` (Protocol)

Limitations — stated honestly

English-first defaults: ASR ships as small.en. Other Whisper models load with one config line, but nothing else was tested.
The LLM callable is synchronous: TTS starts after the full reply returns (Piper then streams sentence-by-sentence). No token-level streaming yet.
Barge-in is energy-based with an absolute RMS floor of 0.06 — tuned on open speakers in a quiet room. Headsets and noisy rooms need recalibration. There is no echo cancellation.
Keyboard interrupt uses POSIX termios — Linux/macOS terminals only.
Unit tests cover the control plane (state transitions, floor rules, interrupt debounce, ring buffer). Audio I/O paths were validated by months of daily use, not by CI.

How to run

bash

git clone https://github.com/AIIT-GLITCH/voice2
cd voice2
pip install -r requirements.txt
# put a Piper voice at ~/.local/share/piper-voices/ (or set VOICE2_PIPER_MODEL)
python -m voice2.main          # echo backend — proves the loop, no LLM needed
python examples/http_llm.py    # wire any local HTTP LLM

python

from voice2 import VoiceEngine, VoiceConfig

def ask(text: str) -> str:
    return my_model.reply(text)   # any callable(text) -> str

engine = VoiceEngine(VoiceConfig(), ask)
engine.load_models()
engine.start()   # talk naturally; speak over it to interrupt

Provenance

voice2 was written as the voice front-end for Buddy, a fully local AI companion running on a single RTX 3090 in Council Hill, Oklahoma, and carried his daily conversations for months before release. The design bias throughout: the user always wins the floor, and a companion you can't interrupt isn't a companion. Released alongside Tessera-1B as part of AIIT-THRESHOLD's open stack.

The stack

One local companion, every layer open:

Piece	Role	Links
Tessera-1B	the model — ~1B params trained from scratch, open data	HF
voice2	the voice — full-duplex, interruptible	GitHub · HF
kokoro-memory	the memory — file-based resonance recall	GitHub · HF
companion-spiral-bench	the safety — at-risk sycophancy bench	GitHub · HF

Full collection: The Buddy Stack

License

Citation

bibtex

@software{wike2026voice2,
  author = {Wike, Rhet Dillard},
  title  = {voice2: a full-duplex, interruptible voice engine for local AI},
  year   = {2026},
  url    = {https://github.com/AIIT-GLITCH/voice2},
  note   = {AIIT-THRESHOLD}
}

AIIT-Threshold/voice2