CPC A61B 5/02427 (2013.01) [A61B 5/02433 (2013.01); A61B 5/02438 (2013.01); A61B 5/681 (2013.01); A61B 5/14552 (2013.01); A61B 2562/0238 (2013.01); A61B 2562/046 (2013.01)] | 20 Claims |
1. An electronic fitness device comprising:
a housing including a bottom wall configured to contact a user's wrist;
a first optical transmitter array positioned at a first location on the bottom wall and operable to output a plurality of optical signals that pass through a user's skin, each optical signal having a unique wavelength;
a first optical receiver positioned at a second location on the bottom wall and operable to receive the optical signals from the first optical transmitter array such that the optical signals travel along a first signal path and a first distance from the first optical transmitter array to the first optical receiver; and
a second optical receiver positioned at a third location on the bottom wall and operable to receive the optical signals from the first optical transmitter array such that the optical signals travel along a second signal path and a second distance from the first optical transmitter array to the second optical receiver, wherein the second signal path is roughly orthogonal to the first signal path and the second distance is different from the first distance;
wherein the first optical receiver is spaced apart from the first optical transmitter array along a first axis, and the second optical receiver is spaced apart from the first optical transmitter array along a second axis, the second axis orthogonal to the first axis, on the bottom wall.
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