Source: Kottke
Subvocal's millimeter-wave radar detects mouth and throat movements without microphones, enabling hands-free text input in loud environments or for users where speech recognition is inaccessible. At 200 wpm, it approaches natural speaking speed—a threshold that matters for adoption beyond proof-of-concept. The real constraint is whether the radar stays accurate across different faces, accents, and indoor interference, not whether the core technology works. This reflects a broader bet among interface startups on sensor miniaturization and edge processing: embedding intelligence in the device itself rather than relying on cloud transcription or connectivity.