Touchless interfaces

摘要

The shape or position of an object is estimated using a device comprising one or more transmitters and one or more receivers, forming a set of at least two transmitter-receiver combinations. Signals are transmitted from the transmitters, through air, to the object. They are reflected by the object and received by the receivers. A subset of the transmitter-receiver combinations which give rise to a received signal meeting a predetermined clarity criterion is determined. The positions of points on the object are estimated using substantially only signals from the subset of combinations.

主权项

1. A handheld device comprising:
a display screen and a plurality of acoustic transducers as part of a user interface, said transducers being arranged in at least two parallel rows; and a processing system configured to process a user input to the handheld device by using acoustic signals reflected off an object to estimate a shape and/or position of the object, and/or to characterise a motion of the object, the acoustic signals being transmitted through air towards the object by said plurality of acoustic transducers and/or being received through the air from the object by said plurality of acoustic transducers.