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Simulated audio: silence → speech → silence. VAD fires when energy crosses threshold.
What you're seeing
Simple energy-threshold VAD: compute RMS energy per 20ms frame; flag as speech if above threshold. Cheap and fast. Vulnerable to background noise spikes.
Neural VAD (Silero, py-webrtcvad) replaces threshold with a small classifier. Near-zero false positives on stationary noise. Standard in production voice agents.
★ KEY TAKEAWAY
VAD distinguishes speech from silence. Energy threshold is simple but noisy. Neural VAD (Silero) is the production default.
▶ WHAT TO TRY
- Slide Threshold — see VAD activation change.
- Too low: triggers on noise. Too high: misses quiet speech.