Voice responsive in-wall device

Smart acoustical electrical switch

Voice responsive in-wall device

Smart acoustical electrical switch

Signal-activated circuit interrupter

SOUND DAMPENING INDIVIDUAL KEY FILTERS

Touch detected voice-prompted 2-stage keypad

Method and apparatus for masking keystroke sounds from computer keyboards

Method and apparatus for masking keystroke sounds from computer keyboards

Acoustic wave touch detection circuit and method

Input apparatus and touch-reading character/symbol input method

Processing signals to determine spatial positions