Patent ID: 8064290
Filing Date: 2011-11-22
Classification: G06F

Abstract:
1. An apparatus comprising a receiver comprising: a base having a planar base surface; first and second acoustical sensors that detect an acoustical signal at a first wavelength emitted by a moveable signal source, said first and second acoustical sensors being mounted on said base and separated from one another; a first EM detector that detects an EM signal that is synchronized with said acoustical signal; and a controller that measures the difference in time of detection between said EM signal and said acoustical signals detected by said first and second acoustical sensors; wherein said first and second acoustical sensors each comprise: a detector that generates an electrical signal in response to an acoustical signal of said first wavelength; a housing surrounding said detector, said housing having an aperture, said aperture having a maximum dimension that is less than said first wavelength divided by 6.28.