Patent ID: 9170657
Filing Date: 2015-10-27
Classification: G06F

Abstract:
1. A host device, comprising: a light sensor; and an analog to digital converter (ADC) coupled to the sensor; a controller, comprising: a sample analyzer to interpret output from the ADC and identify light intensity values corresponding to each light source of a plurality of light sources therefrom; a ratio calculator to derive intensity ratios of the light intensity values corresponding to each of the light sources of the plurality of light sources; and a look up table storing data representing light angle orientation values corresponding to associated light intensity ratios, wherein the light angle orientation values correspond to angles of orientation of a user device with respect to a face of the light sensor, wherein the user device includes the plurality of light sources, each of the angles of orientation being an angle between the major axis of the user device and an axis of light from the plurality of light sources incident on the face of the light sensor, wherein the light sensor is distinct from the user device.