独立本地唤醒与终端转写显示设计

Context

真实运行日志显示，当前 run-live 会先截取语音段并使用 STT 判断是否包含“小杰小杰”。该实现把 wake detection 与 user utterance transcription 绑定在一起，导致唤醒慢、唤醒词污染正式问题、终端输出难以区分 STT 和 LLM 阶段。本设计把 wake word detection 升级为本地 KWS 模型路径，并把正式问题转写作为独立可见事件输出。

Goals

唤醒词“小杰小杰”由本地模型检测。
wake 阶段不调用云 ASR，也不调用正式 STT provider。
wake 命中后才开始正式问题录音和 STT。
终端在 LLM 前显示正式问题转写文本。
模型下载和检查覆盖 wake KWS、VAD、STT。
自动化测试证明 wake/STT 分离、重复对话、上下文和错误恢复仍正常。

Non-Goals

不实现 GUI 桌宠窗口。
不实现跨进程长期记忆。
不在本阶段实现逐字 partial ASR 字幕；本阶段先保证正式问题 STT 完成后立即可见，且出现在 LLM 前。
不把连续麦克风流上传到云端。

Architecture

run-live
  -> AppConfig(.env)
  -> SoundDeviceAudioTransport
  -> SherpaOnnxKeywordWakeWordProvider(local models/wake)
  -> VadRecorder(user utterance, hybrid local+energy VAD by default)
  -> CloudAsrSttProvider or SherpaOnnxSttProvider
  -> TerminalRuntimeReporter.transcript()
  -> ConversationContext
  -> OpenAICompatibleLlmProvider
  -> CloudTtsProvider or MacSayTtsProvider
  -> speaker playback

Runtime Lifecycle

Load config.
Validate OWNER_WAKE_PROVIDER=local_kws.
Load KWS model from OWNER_SPEECH_MODELS_DIR.
Load VAD, STT, LLM, TTS.
Open microphone stream.
Wait for KWS wake event by feeding frames directly into wake provider.
On wake hit, reset wake stream and VAD recorder.
Record user utterance with VAD. The default provider is hybrid: project-local sherpa-onnx VAD remains the primary detector, and an energy threshold fallback prevents low microphone gain from being treated as no speech.
Transcribe user utterance.
Emit transcript to terminal.
Append user text and call LLM.
Synthesize/play reply.
Append assistant reply and return to standby.

Interfaces

`SherpaOnnxKeywordWakeWordProvider`

class SherpaOnnxKeywordWakeWordProvider:
    def __init__(self, models_dir, keyword, keywords_file=None, threshold=0.25, score=1.0, sherpa_module=None): ...
    def load(self) -> None: ...
    def detect(self, frame: AudioFrame) -> WakeEvent | None: ...
    def reset(self) -> None: ...

`RuntimeReporter`

class RuntimeReporter(Protocol):
    def status(self, state: str, message: str, *, turn_id: int | None = None) -> None: ...
    def transcript(self, text: str, *, final: bool, turn_id: int | None = None) -> None: ...
    def error(self, stage: str, code: str, message: str, *, turn_id: int | None = None) -> None: ...

Model Files

models/
  manifest.json
  wake/
    sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile/
      tokens.txt
      encoder-epoch-12-avg-2-chunk-16-left-64.int8.onnx
      decoder-epoch-12-avg-2-chunk-16-left-64.onnx
      joiner-epoch-12-avg-2-chunk-16-left-64.int8.onnx
    keywords.txt
  vad/
    silero_vad.onnx
  stt/
    sherpa-onnx-streaming-zipformer-zh-14M-2023-02-23/

Error Handling

Missing KWS model: WAKE_MODEL_MISSING.
KWS load failure: WAKE_MODEL_LOAD_FAILED.
KWS runtime failure: WAKE_MODEL_LOAD_FAILED with retryable true.
Empty user STT: existing STT_EMPTY_TRANSCRIPT.
Invalid wake provider config: CONFIG_MISSING_VALUE.
Real microphone VAD miss: default OWNER_VAD_PROVIDER=hybrid SHALL accept speech when either the local model or the energy fallback detects speech.

Testing Strategy

Unit test fake wake provider detects wake without STT calls.
Unit test repeated runtime runs two turns with exactly two STT calls.
Unit test terminal reporter records transcript before LLM stage.
Unit test LLM user content excludes wake keyword.
Unit test KWS provider missing model raises structured error.
Model-check test validates wake required files.

Migration

No database migration. Users should run:

python3.11 scripts/download_speech_models.py --dir models
.venv/bin/python -m owner_voice_pet model-check --models-dir models

Existing .env remains valid because new wake keys have defaults.

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