Orientation Determination For A Mobile Device

摘要

A system determines an orientation of a user of a mobile device has a head-mounted accessory device including a first digital compass for providing a first orientation signal and a short-range wireless transmitter for transmitting the first orientation signal to the mobile device. The mobile device includes a short-range wireless receiver for receiving the first orientation signal from the head-mounted accessory device. A processor in the mobile device determines the orientation based on the first orientation signal. The mobile device may include a second digital compass. The system with two compasses provides greater accuracy. By comparing the two orientation signals, the device can infer whether the user is viewing the mobile device. Tilt sensors in the accessory device and mobile device can also be used with the orientation signals to infer whether the user is viewing the mobile device and thus to control content delivered by the mobile device.