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Method for object identification and sensing in a bounded interaction space

  • US 7,474,983 B2
  • Filed: 12/21/2005
  • Issued: 01/06/2009
  • Est. Priority Date: 01/05/2005
  • Status: Active Grant
First Claim
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1. Apparatus for determining the position of a movable object in a detection region comprising, in combination:

  • at least two spaced apart acoustic signal transmitters located at predetermined positions relative to said detection region each of which emits a sequence of timed acoustic signals that traverse said detection region,an acoustic signal sensor carried by said movable object for detecting the times of arrival of said acoustic signals at said movable object,a data processor located remotely from said movable object for calculating said position of said movable object from said times of arrival, andan output device carried by said movable object for receiving notification signals from said data processor and for rendering said notification signals in a form perceptible to a person positioned to move said movable object.

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