Smartwatches can be handy—perhaps too “handy,” given that they require both hands to operate. That can be a problem if your other hand is full, nonfunctioning or missing.
Researchers have tried a variety of approaches to help smartwatch users who lack a free hand, such as putting acoustic sensors on the watchband to capture inputs from finger-tapping. These efforts have concentrated mostly on enabling discrete commands, such as moving down a list of songs one at a time. Voice commands...
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