Backscatter hover detection

Abstract

Disclosed is a controller that modulates the phase, amplitude or phase and amplitude of the signal. The modulated signals are transmitted and interact with an object. Backscattered signals are received by the controller. The received backscattered signals are analyzed to determine the position, movement and/or touch event of a hand or other object.

1 . A sensing system, comprising:
 a transmitter adapted to transmit a plurality of orthogonal signals, wherein each signal transmitted is orthogonal to each other signal transmitted;   a shifter operably connected to the transmitter and adapted to modulate at least some of the plurality of orthogonal signals transmitted from the transmitter;   an emission device adapted to focus the transmitted signals;   at least one wide view receiver adapted to receive the plurality of orthogonal signals; and   a signal processor operably connected to the receiver, wherein the signal processor is adapted to make measurements associated with at least one of the plurality of orthogonal signals received by the at least one receiver, wherein the measurements correlate with touch events.   
     
     
         2 . The sensing system of  claim 1 , wherein the shifter is adapted to modulate amplitude of each of the plurality of orthogonal signals. 
     
     
         3 . The sensing system of  claim 1 , wherein the shifter is adapted to modulate phase of each of the plurality of orthogonal signals. 
     
     
         4 . The sensing system of  claim 1 , wherein the shifter is adapted to modulate phase and amplitude of each of the plurality of orthogonal signals. 
     
     
         5 . The sensing system of  claim 1 , further comprising another emission device. 
     
     
         6 . The sensing system of  claim 1 , wherein at least one of the transmitter and the wide view receiver is adapted to be worn on a wrist. 
     
     
         7 . The sensing system of  claim 1 , wherein at least one of the plurality of orthogonal signals is in a first frequency range and at least one other of the plurality of orthogonal signals is in at least one other frequency range. 
     
     
         8 . The sensing system of  claim 1 , further comprising a second wide view receiver. 
     
     
         9 . The sensing system of  claim 8 , further comprising another emission device. 
     
     
         10 . A method of producing measurements reflective of movement comprising:
 transmitting a plurality of orthogonal signals;   modulating each of the transmitted plurality of orthogonal signals;   focusing each of the modulated plurality of orthogonal signals;   receiving at least one of the modulated plurality of frequency orthogonal signals at at least one wide view receiver after the at least one of the modulated plurality of frequency orthogonal signals interacts with an object; and   measuring the received at least one of the modulated plurality of orthogonal signals.   
     
     
         11 . The method of  claim 10 , wherein modulating comprises modulating the amplitude of each of the plurality of orthogonal signals. 
     
     
         12 . The method of  claim 10 , wherein modulating comprises modulating the phase of each of the plurality of orthogonal signals. 
     
     
         13 . The method of  claim 10 , wherein modulating comprises modulating phase and amplitude of each of the plurality of orthogonal signals. 
     
     
         14 . The method of  claim 10 , wherein at least one of the plurality of orthogonal signals is transmitted in a first frequency range and at least one other of the plurality of orthogonal signals is transmitted in at least one other frequency range. 
     
     
         15 . The method of  claim 10 , wherein there is more than one emission device. 
     
     
         16 . The method of  claim 10 , wherein at least one of the emission devices or the wide view receiver is adapted to be worn on a wrist. 
     
     
         17 . The method of  claim 10 , wherein the plurality of the orthogonal signals are transmitted in an optical range. 
     
     
         18 . The method of  claim 10 , wherein there is more than one wide view receiver. 
     
     
         19 . The method of  claim 10 , wherein there is more than one wide view receiver and more than one plurality of orthogonal signals transmitted s.