Circuit and method for determining motion with redundant comb-arrays
First Claim
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1. A method comprising:
- generating for a first group of photosensitive elements a first quasi-sinusoidal signal at a first time, and a second quasi-sinusoidal signal at a second time in response to motion of light received thereon in a first direction;
computing from the first and second quasi-sinusoidal signals a phase angle change;
computing from the first and second quasi-sinusoidal signals a radius value;
generating for a second group of photosensitive elements a third quasi-sinusoidal signal at the first time, and at the second time a fourth quasi-sinusoidal signal in response to the motion of the light received thereon in the first direction;
computing from the third and fourth quasi-sinusoidal signals another phase angle change;
computing from the third and fourth quasi-sinusoidal signals another radius value; and
combining phase angle changes using radius-weighted-averaging to provide a single weighted average phase angle change resulting from the motion of the light in the first direction.
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Abstract
An optical navigation system and method are provided. In one embodiment, the method includes: (i) generating for a first group of photosensitive elements a first quasi-sinusoidal signal at a first time, and a second quasi-sinusoidal signal at a second time in response to motion of light received thereon in a first direction; (ii) computing from the first and second quasi-sinusoidal signals a phase angle change; and (iii) computing from the first and second quasi-sinusoidal signals a radius value. Other embodiments are also described.
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Citations
9 Claims
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1. A method comprising:
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generating for a first group of photosensitive elements a first quasi-sinusoidal signal at a first time, and a second quasi-sinusoidal signal at a second time in response to motion of light received thereon in a first direction; computing from the first and second quasi-sinusoidal signals a phase angle change; computing from the first and second quasi-sinusoidal signals a radius value; generating for a second group of photosensitive elements a third quasi-sinusoidal signal at the first time, and at the second time a fourth quasi-sinusoidal signal in response to the motion of the light received thereon in the first direction; computing from the third and fourth quasi-sinusoidal signals another phase angle change; computing from the third and fourth quasi-sinusoidal signals another radius value; and combining phase angle changes using radius-weighted-averaging to provide a single weighted average phase angle change resulting from the motion of the light in the first direction. - View Dependent Claims (2, 3)
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4. A method comprising:
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generating for a first group of photosensitive elements a first quasi-sinusoidal signal at a first time, and a second quasi-sinusoidal signal at a second time in response to motion of light received thereon in a first direction; generating for a second group of photosensitive elements a third quasi-sinusoidal signal at the first time, and at the second time a fourth quasi-sinusoidal signal in response to motion of light received thereon in the first direction; computing from the first and second quasi-sinusoidal signals a first phase angle change, and from the third and fourth quasi-sinusoidal signals a second phase angle change; and combining the first and second phase angle changes to provide a single average phase angle change resulting from the motion in the first direction. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification