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Speech generation device with a projected display and optical inputs

  • US 9,760,123 B2
  • Filed: 08/03/2011
  • Issued: 09/12/2017
  • Est. Priority Date: 08/06/2010
  • Status: Active Grant
First Claim
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1. A speech generation device, comprising:

  • a projector configured to project images in the form of a projected display onto a projection surface disposed in front of a user;

    a lap tray mounted to a portion of a wheelchair, the lap tray configured to be rotatable relative to a user sitting in the wheelchair, and the lap tray configured to provide the projection surface, wherein at least the projection surface of the lap tray is configured as a non-transparent surface;

    an eye tracking device configured to capture images of a user'"'"'s eyes as the user views the projected display, wherein the eye tracking device is attached to the projection surface at a location outside of and adjacent to a portion of the projection surface configured to receive the projected display from the projector;

    a speaker configured to generate an audio output; and

    a processing unit communicatively coupled to the projector, the eye tracking device and the speaker, the processing unit including a processor and a related computer readable medium configured to store instructions executable by the processor,wherein the instructions stored on the computer readable medium configure the processing unit to generate text-to-speech output,wherein the instructions stored on the computer readable medium further configure the processing unit to track the user'"'"'s eye gaze relative to the user'"'"'s point of regard on the projected display based on the images provided by the eye tracking device and configure the processing unit to provide for display, via the projector, a cursor position at a location on the projected display that corresponds to the user'"'"'s point of regard on the projected display, andwherein the instructions stored on the computer readable medium configure the processing unit to determine the cursor position corresponding to the user'"'"'s point of regard on the projected display by implementing a mapping function that maps eye gaze measurements determined from the images of the user'"'"'s eyes provided by the eye tracking device to a two-dimensional coordinate space associated with the projected display and convert the images of the user'"'"'s eyes into a cursor position displayed onto the projected display.

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