A method of creating a privacy mask from an image imaged by an imaging device in which a rotation axis of a camera and a center of a lens do not match includes measuring a distance from the camera to an object in a first imaging condition; creating a first mask for the object, and storing the distance together with the first mask; and creating a second mask for the object in a second imaging condition and correcting a position of the second mask using the first mask and the distance, wherein an imaging angle of the camera the first imaging condition is same as the imaging angle of the camera in the second imaging condition, and wherein a position of the lens in the first imaging condition is reversed around the rotation axis from a position of the lens in the second imaging condition.

A contactless power supply and motor control system includes a pulse width modulator, a rotary transformer, a demodulator circuit, a motor driver, and a motor. The pulse width modulator supplies a first pulse width modulated (PWM) signal that has a duty cycle and a first amplitude. The rotary transformer receives the PWM signal. The secondary winding is rotatable relative to the primary winding and supplies a second PWM signal having the duty cycle and a second amplitude. The demodulator circuit is rotatable with the secondary winding and supplies a demodulated direct current (DC) voltage having a DC voltage amplitude. The motor driver is rotatable with the secondary winding and the demodulator circuit and controllably supplies motor current. The motor receives the motor current and rotates at a rotational speed.

A method for ascertaining a change in a spatial orientation of a nuclear magnetic resonance (NMR) gyroscope having a diamond doped with color centers includes applying a static external magnetic field in a first direction, polarizing a nuclear spin of the color centers of the diamond in a direction of the static magnetic field, and generating a cophasal Larmor precession of the nuclear spin of the color centers of the diamond through application of an alternating magnetic field in a second direction perpendicular to the first direction, whose frequency corresponds to the Larmor frequency of the nuclear spin of the color centers. The method further includes measuring a phase of the Larmor precession, and ascertaining a change in the spatial orientation in a plane perpendicular to the first direction based on a deviation of the precession frequency from an expected value.

A method for ascertaining a change in a spatial orientation of a nuclear magnetic resonance (NMR) gyroscope having a diamond doped with color centers includes applying a static external magnetic field in a first direction, polarizing a nuclear spin of the color centers of the diamond in a direction of the static magnetic field, and generating a cophasal Larmor precession of the nuclear spin of the color centers of the diamond through application of an alternating magnetic field in a second direction perpendicular to the first direction, whose frequency corresponds to the Larmor frequency of the nuclear spin of the color centers. The method further includes measuring a phase of the Larmor precession, and ascertaining a change in the spatial orientation in a plane perpendicular to the first direction based on a deviation of the precession frequency from an expected value.

An electronic device comprises: a memory; a battery; a speaker; a sensor module; a communication module; and a processor electrically connected to the memory, the battery, the speaker, the sensor module, and the communication module, wherein the processor is configured to: control the communication module to establish a first communication link with a sound source electronic device and transmit a first posture value calculated based on a sensor value obtained from the sensor module over the first communication link, receive audio data rendered based on the posture value from the sound source electronic device, communicate, based on device state information of the electronic device, with an external electronic device through a second communication link so as to request a role switching preparation, and transmit a role switching message to the external electronic device and notify the sound source electronic device of role switching with the external electronic device, wherein after role switching, the electronic device transmits the first posture value to the external electronic device.

An electronic device comprises: a memory; a battery; a speaker; a sensor module; a communication module; and a processor electrically connected to the memory, the battery, the speaker, the sensor module, and the communication module, wherein the processor is configured to: control the communication module to establish a first communication link with a sound source electronic device and transmit a first posture value calculated based on a sensor value obtained from the sensor module over the first communication link, receive audio data rendered based on the posture value from the sound source electronic device, communicate, based on device state information of the electronic device, with an external electronic device through a second communication link so as to request a role switching preparation, and transmit a role switching message to the external electronic device and notify the sound source electronic device of role switching with the external electronic device, wherein after role switching, the electronic device transmits the first posture value to the external electronic device.

Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization in light waves in an optical loop due to rotation without using optical interferometry and a closed loop feedback in modulating the light in the optical loop.

Techniques and devices for optical sensing of rotation based on measurements and sensing of optical polarization or changes in optical polarization in light waves in an optical loop due to rotation without using optical interferometry and a closed loop feedback in modulating the light in the optical loop.

Disclosed herein are configurations and methods to produce very low loss waveguide structures, which can be single-layer or multi-layer. These waveguide structures can be used as a sensing component of a small-footprint integrated optical gyroscope. By using pure fused silica substrates as both top and bottom cladding around a SiN waveguide core, the propagation loss can be well below 0.1 db/meter. Low-loss waveguide-based gyro coils may be patterned in the shape of a spiral (circular or rectangular or any other shape), that may be distributed among one or more of vertical planes to increase the length of the optical path while avoiding the increased loss caused by intersecting waveguides in the state-of-the-art designs. Low-loss adiabatic tapers may be used for a coil formed in a single layer where an output waveguide crosses the turns of the spiraling coil.

Disclosed herein are configurations and methods to produce very low loss waveguide structures, which can be single-layer or multi-layer. These waveguide structures can be used as a sensing component of a small-footprint integrated optical gyroscope. By using pure fused silica substrates as both top and bottom cladding around a SiN waveguide core, the propagation loss can be well below 0.1 db/meter. Low-loss waveguide-based gyro coils may be patterned in the shape of a spiral (circular or rectangular or any other shape), that may be distributed among one or more of vertical planes to increase the length of the optical path while avoiding the increased loss caused by intersecting waveguides in the state-of-the-art designs. Low-loss adiabatic tapers may be used for a coil formed in a single layer where an output waveguide crosses the turns of the spiraling coil.