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tune: Adjust VAD parameters for longer segments

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- min_speech_duration: 300ms → 1000ms (avoid tiny segments)
- silence_duration: 400ms → 700ms (wait longer before cutting)
- hang_frames_threshold: 20 → 35 (~350ms pause tolerance)

This should reduce mid-sentence cuts and give Whisper more context.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Trouve Alexis 2025-11-23 22:08:01 +08:00
parent 53b21b94d6
commit a28bb89913
1 changed files with 3 additions and 3 deletions
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6
src/audio/AudioCapture.h
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@ -69,8 +69,8 @@ private:
// VAD parameters - Higher threshold to avoid false triggers on filtered noise // VAD parameters - Higher threshold to avoid false triggers on filtered noise
std::atomic<float> vad_rms_threshold_{0.02f}; // Was 0.01f std::atomic<float> vad_rms_threshold_{0.02f}; // Was 0.01f
std::atomic<float> vad_peak_threshold_{0.08f}; // Was 0.04f std::atomic<float> vad_peak_threshold_{0.08f}; // Was 0.04f
int silence_duration_ms_ = 400; // Wait 400ms of silence before cutting int silence_duration_ms_ = 700; // Wait 700ms of silence before cutting (was 400)
int min_speech_duration_ms_ = 300; // Minimum speech to send int min_speech_duration_ms_ = 1000; // Minimum 1s speech to send (was 300)
int max_speech_duration_ms_ = 25000; // 25s max before forced flush int max_speech_duration_ms_ = 25000; // 25s max before forced flush
// Adaptive noise floor // Adaptive noise floor
@ -79,7 +79,7 @@ private:
// Hang time - wait before cutting to avoid mid-sentence cuts // Hang time - wait before cutting to avoid mid-sentence cuts
int hang_frames_ = 0; int hang_frames_ = 0;
int hang_frames_threshold_ = 20; // ~200ms tolerance for pauses int hang_frames_threshold_ = 35; // ~350ms tolerance for pauses (was 20)
// Zero-crossing rate for speech vs noise discrimination // Zero-crossing rate for speech vs noise discrimination
float last_zcr_ = 0.0f; float last_zcr_ = 0.0f;