Angle measurement by use of multiple oriented light sources

摘要

Embodiments of the present invention may provide a relative angular motion measurement system that includes a remote device used to control operations of a host device. The remote may include a plurality of light sources with predetermined light distribution patterns and angles of orientation with respect to a major axis of the remote. The host device may include a sensor and a controller. The sensor may detect light emitted from the remote (via the light sources) and generate output signals that may be interpreted by the controller. The controller may interpret the output signals from the sensor to estimate received intensity from each light source and calculate the orientation of the remote device based on data representing the light sources' light distribution patterns with fixed angles of orientation.

主权项

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.