Drunk-dialing your former girlfriends from a noisy bar just got intelligible, if not intelligent. A mobile-phone headset from Aliph debuts a noise-suppression system that its designers say can drown out a weed whacker. Jawbone ($150), due this fall, uses a digital signal processor (DSP) running proprietary algorithms to scrub background noise from your outgoing calls. What's unique is its voice activity sensor, a rubber node that rests against the cheek and picks up vocal vibrations through your jawbone. This crucial stream of data--are you talking or not?--when analyzed in conjunction with data from the two microphones, helps the DSP calculate a precise digital map of the noise. It then compares this against everything it hears, and removes the din before shipping out a clean signal. The upshot: Jawbone makes a more informed call about what is noise and what is voice. As for the decisions you make, you're on your own.