Hillcrest Laboratories, Inc.

Idhl Holdings, Inc.

Jetperch LLC

Interdigital Patent Holdings, Inc.

Matthew G Liberty

Charles W K Gritton

Daniel S Simpkins

Frank A Hunleth

Mark A Turner

Bryan Austin Cook

Hua Sheng

Christopher David Roller

Arno Penzias

Friedrich G Geck

Yun Li

Pouyan Amirshahi

Christopher D Roller

An auto ranging ammeter that allows improved measurement of rapidly changing, high-dynamic range electrical currents. The ammeter computes current during range switches by using digital signal processing to combine voltage measured over both a variable shunt resistor and a fixed shunt resistor. The ammeter uses fast comparators and digital processing to select the appropriate shunt resistor. The auto ranging ammeter includes a voltmeter which enables the device to output current, voltage, power, charge, and energy consumed by a target device under test.

Auto ranging ammeter with accurate measurement during range changes

An autoranging ammeter with fast dynamic response allows improved dynamic measurement of rapidly changing direct electrical currents. The ammeter utilizes a low-cost dual threshold comparator mechanism coupled with an analog-to-digital converter and digital processing to rapidly select the appropriate current shunt resistor.

Autoranging ammeter with fast dynamic response

Systems and methods according to the present invention address these needs and others by providing a handheld device, e.g., a 3D pointing device, which uses at least one sensor to detect motion of the handheld device. The detected motion can then be mapped into a desired output, e.g., cursor movement.

3D pointing devices and methods

A gaming system comprises a handheld user input device, a processor for receiving input data from the handheld user input device and a gaming application for receiving data from the processor based on the received input data from the handheld user input device. The handheld user input device emulates one of a plurality of different devices associated with the gaming application. Each of the plurality of different devices have a set of input commands associated therewith. The set of input commands associated with the one of a plurality of different devices includes a command based on one of motion and orientation of the handheld device.

Semantic gaming and application transformation

A bias value associated with a sensor, e.g., a time-varying, non-zero value which is output from a sensor when it is motionless, is estimated using a ZRO-tracking filter which is a combination of a moving-average filter and a Kalman filter having at least one constraint enforced against at least one operating parameter of the Kalman filter. It achieves faster convergence on an estimated bias value and produces less estimate error after convergence. A resultant bias estimate may then be used to compensate the biased output of the sensor in, e.g., a 3D pointing device.

Methods, devices and systems for determining the zero rate output of a sensor

Systems and methods according to the present invention describe 3D pointing devices which enhance usability by transforming sensed motion data from a first frame of reference (e.g., the body of the 3D pointing device) into a second frame of reference (e.g., a user's frame of reference). One exemplary embodiment of the present invention removes effects associated with a tilt orientation in which the 3D pointing device is held by a user.

3D pointing devices with orientation compensation and improved usability

Systems, devices, methods and software are described for mapping movement or motion of a 3D pointing device into cursor position; e.g., for use in rendering the cursor on a display. Absolute and relative type mapping algorithms are described. Mapping algorithms can be combined to obtain beneficial characteristics from different types of mapping.

3D pointer mapping

A forward pointing direction associated with a handheld device is estimated or determined by, for example, calculating a center of rotation of the device. A resultant combined or selected bias estimate may then be used to compensate the biased output of the sensor in, e.g., a 3D pointing device.

Determining forward pointing direction of a handheld device

A method, a filtering module, and a computer-readable medium are configured to filter measurements acquired in a sensor reference system. Filtered measurements of motion sensors and a magnetometer attached to the device may then be used to determine orientation of a device in a non-inertial reference system. The measurements are filtered in a reference system, whose position relative to the sensor system can be calculated, and in which gravity and Earth's magnetic field have substantially constant direction and magnitude during the filtering window.

Growing community of inventors

Gaithersburg, MD, United States of America

Matthew G Liberty