Luidia Inc.

Philip A Weaver

Xiang Zhu

Ari Birger

A mobile device providing a mobile processing function such as a mobile telephone and/or a personal digital assistant. The mobile device includes a mobile device body, a processing system within the body, the processing system programmed to be part of providing the mobile processing function, a projector coupled to the body to project an image onto a substantially planar surface when the mobile device body is on the surface at a predetermined angle relative to the surface, and a pen-location transcription system coupled to the processing system to record the positions of a writing implement at a plurality of instants of time by transmitting energy between the writing implement and a device mechanically coupled to the mobile device body. In one version, the device mechanically coupled to the mobile device body is a sensor array including at least two sensors of the transmitted energy. The writing implement includes a transmitter of the transmitted energy. In another embodiment, the device mechanically coupled to the mobile device body includes one or more transmitters transmitting the energy, and the writing implement includes at one or more sensors of the transmitted energy.

Mobile device incorporating projector and pen-location transcription system

An apparatus and a method for determining the location of a pointing device in the vicinity of a set of receivers able to receive one or more locating signals transmitted through a medium. The method includes receiving at a receiver a signal that includes a locating signal and an interfering signal, determining an estimated interference signal indicative of the interfering signal included in the signal received, determining a signal indicative of the difference between the received signal and the estimated interference signal, and using the signal indicative of the difference to compute the location of the pointing device on a surface near the set of receivers. One version uses a separate receiver from which to determine the estimated interference signal, while another version uses the received signal at a time when there is expected to be no locating signal present in order to determine the estimated interference signal. An adaptive filter computes the estimated interference signal.

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Mountain View, CA, United States of America

Philip A Weaver