Patent ID: 9411440
Filing Date: 2016-08-09
CPC Classification: G06F

Claim Text:
1. An acoustic tracking system, comprising: a first plurality of receivers that detects first acoustic signals from a first set of transmitters disposed on a digital pen; a second plurality of receivers that detects second acoustic signals from a second set of transmitters disposed on a base station, wherein the first plurality of receivers and the second plurality of receivers are disposed on a computing device separate from the digital pen and base station; a processing component that defines, based on the second acoustic signals, a two-dimensional plane on which the base station lies, determines, based on the first and second acoustic signals, a three-dimensional position of the digital pen relative to the base station, and projects the three-dimensional position of the digital pen onto the two-dimensional plane; and an application controller that records, based on the projected three-dimensional position of the digital pen onto the two-dimensional plane, the three-dimensional position of the digital pen relative to the base station, wherein the recorded three-dimensional position of the digital pen represents an object representative of movement of the digital pen.