How It Works — In Plain Language
Standard doorbells trigger barking because dogs hear the sudden sound and react on instinct. HushBell replaces that with two carefully chosen signals that dogs cannot hear or react to.
Channel 1: 40Hz tactile tone. Dogs hear from 67Hz upwards. A 40Hz tone sits below their hearing floor entirely. You feel it as a low rumble through the speaker or furniture — the real hardware uses a tactile transducer bolted to a surface. The dog hears nothing.
Channel 2: 2000Hz with 500ms fade-in. The acoustic startle reflex in dogs triggers when a sound appears in under 20 milliseconds. By fading the 2000Hz tone in over 500 milliseconds — 25 times slower than the startle threshold — the sound registers as background ambient noise rather than an alarm. No bark.
Combined, the two channels give a 99% no-bark probability on the tactile channel alone. The spectrum analyser above proves both frequencies are present in real time.
Design by Thomas Frumkin. Implementation by CodeTonight. AI Craftspeople Guild.