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US 11,961,494 B1Granted
Electromagnetic interference reduction in extended reality environments
AssigneeMeta Platforms Technologies, LLC
InventorsNing Guo, Akshay Yembarwar, Jonathan Reid, Daniel Wetmore
Life of this patent
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Abstract
Methods and systems for reducing electromagnetic interference in analog circuit of a control device for an augmented reality (AR) or virtual reality (VR) system are described. An analog circuit associated with the control device may include at least one amplifier and an analog-to-digital converter coupled to an amplifier by one or more electrical conductors. Electromagnetic interference induced in the one or more electrical conductors by an external AC magnetic field may be reduced using at least one component of the control device configured to reduce the electromagnetic interference.
Claims22
An apparatus, comprising:
- a head-mounted device that, when worn by a user, is configured to present an extended reality view to the user;
- and
- a control device comprising one or more electrodes that, when worn on a wrist of the user, contact the skin of the user, the control device comprising:
- an analog circuit including an amplifier configured to receive sensor signals from the one or more electrodes and an anti-aliasing filter;
- an analog-to-digital converter (ADC) configured to receive analog sensor signals from the analog circuit and provide digital sensor signals, wherein the anti-aliasing filter is located proximate the ADC such that an electrical connection between the anti-aliasing filter and the ADC is approximately 1.5 cm or less;
- a processor configured to receive the digital sensor signals and provide control signals based on the digital sensor signals;
- and
- a control device antenna configured to transmit the control signals to the head-mounted device,
- wherein the head-mounted device is configured to modify the extended reality view in response to the control signals.
6 more elements
An apparatus, comprising:
- a head-mounted device that includes a magnetic tracking system transmitter, and when worn by a user, is configured to present an extended reality view to the user;
- a control device comprising one or more electromyography electrodes that contact the skin of the user when worn by the user, the control device comprising:
- an analog circuit including an anti-aliasing filter and an amplifier configured to receive electromyography sensor signals from the one or more electrodes;
- a shielding layer configured to shield the analog circuit from electromagnetic radiation produced by the magnetic tracking system transmitter;
- an analog-to-digital converter (ADC) configured to receive analog sensor signals from the analog circuit and provide digital sensor signals, wherein the anti-aliasing filter is located proximate the ADC such that an electrical connection between the anti-aliasing filter and the ADC is approximately 1.5 cm or less;
- a processor configured to receive the digital sensor signals and provide control signals based on the digital sensor signals;
- a magnetic tracking system receiver;
- and
- a control device antenna configured to transmit the control signals to the head-mounted device,
- wherein the head-mounted device is configured to modify the extended reality view in response to the control signals.
7 more elements
An apparatus, comprising:
- a head-mounted device that, when worn by a user, is configured to present an extended reality view to the user;
- and
- a control device comprising one or more electrodes that, when worn on a wrist of the user, contact the skin of the user, the control device comprising:
- an analog circuit including an amplifier configured to receive sensor signals from the one or more electrodes;
- an analog-to-digital converter (ADC) configured to receive analog sensor signals from the analog circuit and provide digital sensor signals, wherein the amplifier is located proximate the ADC such that an electrical connection between an output of the amplifier and an input of the ADC is less than approximately 3 mm;
- a processor configured to receive the digital sensor signals and provide control signals based on the digital sensor signals;
- and
- a control device antenna configured to transmit the control signals to the head-mounted device,
- wherein the head-mounted device is configured to modify the extended reality view in response to the control signals.
6 more elements
Dependencies are inferred from the claim text.