Patent ID: 7536020

Claim:
A wearable command input device for inputting information by tapping a finger of a user on a surface of an object or by tapping the fingertips mutually, wherein said wearable command input device can be mounted on the user's body and comprises: detecting means for detecting tap vibrations which arise when the user taps the finger on the surface of the object and are transmitted through the user's finger; a vibration generator, applicable to be mounted on the user's wrist, for generating wrist vibrations which arise when the user's wrist is bent or twisted and which have specific frequencies different from the frequencies of the tap vibrations; extracting means for extracting tap signals which are signal components of the tap vibrations and wrist signals which are signal components of the wrist vibrations from output signals from said detecting means; a trigger generator for outputting a series of trigger signals by detecting the presence or the absence of the tap signals while suppressing the detection of the tap signals from said extracting means if the wrist signals from said extracting means are detected; and a command generator for outputting commands corresponding to said trigger signals.