Abstract: A wearable device that tracks body movement is disclosed. The device includes a housing and a connection member. The connection member is coupled to the housing, and the connection member enables the device to be coupled to a user's body part. This body part is associated with the conductive matter. The device includes an RF sensor in the housing. The RF sensor oscillates at a preselected frequency. The RF sensor is tuned to resonate when the RF sensor is located a preselected distance from the conductive matter. As the conductive matter moves closer or farther from the RF sensor based on user movement, a resulting waveform generated based on data from the RF sensor is modified, and the resulting waveform is usable to determine how the user moved.

Abstract: A head mounted device includes a base gasket and a custom gasket rim that is selectively connectable to and disconnectable from the base gasket. The custom gasket rim is configured to intervene between the base gasket and a face of a user.

Abstract: A wearable device that tracks body movement is disclosed. The device includes a housing and a connection member. The connection member is coupled to the housing, and the connection member enables the device to be coupled to a user's body part. This body part is associated with the conductive matter. The device includes an RF sensor in the housing. The RF sensor oscillates at a preselected frequency. The RF sensor is tuned to resonate when the RF sensor is located a preselected distance from the conductive matter. As the conductive matter moves closer or farther from the RF sensor based on user movement, a resulting waveform generated based on data from the RF sensor is modified, and the resulting waveform is usable to determine how the user moved.

Abstract: A head-mounted mixed-reality (MR) device that is wearable by a user is disclosed. The MR device includes a user-facing display that displays user-directed content. The user-directed content is visible from a first position of a user who is wearing the MR device. The MR device further includes an outward-facing display that displays outward-directed content. The outward-directed content is visible from a second position that is external relative to the position of the user who is wearing the MR device.

Abstract: A wearable device that tracks body movement is disclosed. The device includes a housing and a connection member. The connection member is coupled to the housing, and the connection member enables the device to be coupled to a user's body part. This body part is associated with the conductive matter. The device includes an RF sensor in the housing. The RF sensor oscillates at a preselected frequency. The RF sensor is tuned to resonate when the RF sensor is located a preselected distance from the conductive matter. As the conductive matter moves closer or farther from the RF sensor based on user movement, a resulting waveform generated based on data from the RF sensor is modified, and the resulting waveform is usable to determine how the user moved.

Abstract: A system for facilitating secure communications accesses a secure element in response to determining that an authorized user operates the system. The system causes a light emitter to emit an output light signal for detection by a second system. The output light signal is emitted according to a predefined field of view, which operates as a constraint to prevent devices outside of the field of view from detecting the output light signal. The system also configures the light detector to detect a second output light signal emitted by a second light emitter of the second system. In response to (i) detection of the output light signal by a second light detector of the second system and (ii) detection of the second output light signal by the light detector, the system enables secure communication between the system and the second system.

Abstract: Systems and methods are provided for improving a reflection signal of a radar antenna assembly. For example, disclosed embodiments are directed to a multiple retrodirective surface mount antenna assembly comprising a plurality of retrodirective antenna arrays, each retrodirective antenna array being angularly offset from at least one other retrodirective antenna array and being configured to reflect a radar signal received from a radar signal source to a radar signal receiver.

Abstract: A head mounted device includes a base gasket and a custom gasket rim that is selectively connectable to and disconnectable from the base gasket. The custom gasket rim is configured to intervene between the base gasket and a face of a user.

Abstract: A system for facilitating pose detection using multi-chirp FMCW radar is configurable to emit a multi-chirp frequency modulated continuous wave (FMCW) radar signal comprising a high-bandwidth chirp and a low-bandwidth chirp, detect a reflected multi-chirp FMCW radar signal comprising a reflected high-bandwidth chirp and a reflected low-bandwidth chirp, determine a first object pose data using the reflected high-bandwidth chirp, and determine a second object pose data using the reflected low-bandwidth chirp.

Abstract: Examples are disclosed related to optically transparent antennas. One example provides a proximity sensor, comprising an electrically insulating substrate that is at least partially optically transparent, one or more antennas disposed on the electrically insulating substrate, each antenna comprising a film of a conductive material that is at least partially optically transparent, the one or more antennas comprising a proximity sensing antenna, and a resonant LC circuit electrically coupled to the proximity sensing antenna, the resonant LC circuit configured to output a signal responsive to a position of a surface relative to the proximity sensing antenna.

Abstract: A vision-control system comprises an electrochromic insert and at least two peripheral contacts. The electrochromic insert includes at least two transparent electrodes and is configured for arrangement on a side of a head-worn frame of a near-eye display system. The peripheral contacts extend to the transparent electrodes.

Abstract: A system for facilitating secure communications accesses a secure element in response to determining that an authorized user operates the system. The system causes a light emitter to emit an output light signal for detection by a second system. The output light signal is emitted according to a predefined field of view, which operates as a constraint to prevent devices outside of the field of view from detecting the output light signal. The system also configures the light detector to detect a second output light signal emitted by a second light emitter of the second system. In response to (i) detection of the output light signal by a second light detector of the second system and (ii) detection of the second output light signal by the light detector, the system enables secure communication between the system and the second system.

Abstract: Examples are disclosed related to optically transparent antennas. One example provides a device, comprising an electrically insulating substrate that is at least partially optically transparent, one or more antennas disposed on the electrically insulating substrate, each antenna comprising a film of a conductive material that is at least partially optically transparent, the one or more antennas comprising a communication antenna, and processing circuitry electrically coupled to the communication antenna, the processing circuitry configured to one or more of send or receive signals via the communication antenna.

Abstract: Examples are disclosed that relate to generating expressive avatars using multi-modal three-dimensional face modeling and tracking. One example includes a computer system comprising a processor coupled to a storage system that stores instructions. Upon execution by the processor, the instructions cause the processor to receive initialization data describing an initial state of a facial model. The instructions further cause the processor to receive a plurality of multi-modal data signals. The instructions further cause the processor to perform a fitting process using the initialization data and the plurality of multi-modal data signals. The instructions further cause the processor to determine a set of parameters based on the fitting process, wherein the determined set of parameters describes an updated state of the facial model.

Abstract: An electronic device may utilize various methods or systems to determine whether the electronic device is indoors or outdoors. The electronic device transmits wireless signals (e.g., radio detection and ranging (RADAR) signals). The electronic device receives reflections of the wireless signals. Using these received reflections of the wireless signals, the electronic device determines whether a power amplitude of the reflections is greater than or equal to a threshold value. In response to a determination that the power amplitude is not greater than or equal to the threshold value, the electronic device operates in an outdoor mode or an indoor mode.

Abstract: A method for human movement classification includes a plurality of radio frequency (RF) antennas to expose a body surface of a human user to an E-field, at least a part of the human user positioned within a near-field region relative to the RF antennas. The plurality of RF antennas are scanned to determine ground-relative changes in electrical conditions. A differential-scanning subset of RF antennas are selected, including two or more RF antennas for which the changes in electrical conditions exceed a threshold. For each RF antenna in the differential-scanning subset, a set of antenna-relative changes in electrical conditions are determined by comparing the RF antenna to one or more other RF antennas in the differential-scanning subset as a plurality of pairs. Based at least in part on the ground-relative changes in electrical conditions and the antenna-relative changes in electrical conditions, a movement performed by the human user is classified.

Abstract: Examples are disclosed that relate to determining a capacitance based on a charge accumulated on a sense capacitor electrode. One example provides a head-mounted device comprising a facial-tracking sensor, a controller, and a charge sensing circuit connected to the facial-tracking sensor. The facial-tracking sensor comprises a sense capacitor electrode configured to be positioned proximate to a surface of a face and form a capacitance based upon a distance between the sense capacitor electrode and the surface of the face, and the controller configured to apply a reference voltage to the sense capacitor electrode. The charge sensing circuit is configured to determine the capacitance of the sense capacitor electrode by determining an amount of charge accumulated on the sense capacitor electrode resulting from the reference voltage.

Abstract: A method for training a neural network for facial expression recognition includes recognizing a plurality of digital human face models. For each of the plurality of digital human face models, a plurality of simulated facial expressions are simulated. Simulated capacitance measurements for an array of simulated radio frequency (RF) antennas are found for each of the plurality of simulated facial expressions. The simulated capacitance measurements for each simulated facial expression are provided as input training data to a neural network configured to output facial expression parameters based on input capacitance measurements.

Abstract: Techniques disclosed herein may be utilized to detect, measure, and/or track the location of objects via radar sensor devices that are affixed to a wearable device. Each of the radar sensors (e.g., MIMIC radar sensor) generates, captures, and evaluates radar signals associated with the wearable device (e.g., HMD) and the surrounding environment. Objects located within the field of view with sufficient reflectivity will result in radar return signals each with a characteristic time of arrival (TOA), angle of arrival (AOA), and frequency shift (Doppler shift). The sensed return signals can be processed to determine distance and direction, as well as identification of the objects based on radar characteristics of the object (e.g., radar back-scatter or cross-section pattern). Object information, including position and identification, may be further resolved based on correlation with measurements from one or more of the digital cameras or inertial measurement units.

Abstract: A head-mounted device (HMD) has a segmented metal chassis including a plurality of physically separate radio frequency (RF) antennas corresponding to different head regions. The HMD further includes a plurality of RF transceivers, each electrically connected to a corresponding RF antenna. Each RF transceiver is configured to drive the corresponding RF antenna with a drive signal at a frequency within a resonant frequency band of the corresponding RF antenna and sense a frequency response to the drive signal. The HMD further includes a plurality of notch filter circuits, each electrically connected in series with a corresponding RF antenna. Each notch filter is configured to attenuate signals at frequencies within the resonant frequency band of the corresponding RF antenna and pass signals at frequencies outside of the resonant frequency band, such that the segmented metal chassis functions as a common ground plane.