A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load, the waveform signal comprising a first tone at a first driving frequency and a second tone at a second driving frequency. The method may also include during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may further include determining amplitude and phase information of the current signal responsive to the first tone and second tone, determining amplitude and phase information of the back electromotive force signal responsive to the first tone and second tone, and identifying parameters of the mechanical impedance of the electromagnetic load based on the amplitude and phase information of the current signal and the amplitude and phase information of the back electromotive force signal.

A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load, the waveform signal comprising a first tone at a first driving frequency and a second tone at a second driving frequency. The method may also include during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may further include determining amplitude and phase information of the current signal responsive to the first tone and second tone, determining amplitude and phase information of the back electromotive force signal responsive to the first tone and second tone, and identifying parameters of the mechanical impedance of the electromagnetic load based on the amplitude and phase information of the current signal and the amplitude and phase information of the back electromotive force signal.

The disclosure describes a virtual reality system, including: a database configured to store sensory information paired with at least one virtual object; a virtual reality rendering unit to render the virtual object, where the virtual reality rendering unit is configured to render a virtual representation of a user of the system; a signal control unit configured to be connected to the virtual reality rendering unit; and a sensory stimulation unit comprising one or more sensory stimulators, where the one or more sensory stimulators are configured to be connected to at least part of an actual body of the user of the system, where the signal control unit is further configured to communicate the sensory information to the sensory stimulation unit upon interaction between the virtual object and the virtual representation in the virtual reality, and where the one or more sensory stimulators are configured to stimulate the part of the user's actual body based on the sensory information.

A hands-free intercom may include a user-tracking sensor, a directional microphone, a directional sound emitter, a display device, and/or a communication interface. The user-tracking sensor may determine a location of a user so the directional microphone can measure vocal emissions by the user and the directional sound emitter can deliver audio to the user. The hands-free intercom may induce the user to move to a desired location and/or to stay within a connectivity area. The hands-free intercom may also or instead induce the user to face in a desired orientation. The directional sound emitter and/or the display device may induce the user by explicitly indicating the desired location, by adjusting an apparent source of the audio or video, by changing quality of delivered audio or video based on user position, by producing irritating audio or video, and/or the like.

A hands-free intercom may include a user-tracking sensor, a directional microphone, a directional sound emitter, a display device, and/or a communication interface. The user-tracking sensor may determine a location of a user so the directional microphone can measure vocal emissions by the user and the directional sound emitter can deliver audio to the user. The hands-free intercom may induce the user to move to a desired location and/or to stay within a connectivity area. The hands-free intercom may also or instead induce the user to face in a desired orientation. The directional sound emitter and/or the display device may induce the user by explicitly indicating the desired location, by adjusting an apparent source of the audio or video, by changing quality of delivered audio or video based on user position, by producing irritating audio or video, and/or the like.

A safe-wash device to assist in washing hands at a handwashing station. The safe-wash device includes a housing, a sensor, a speaker, a display unit and a controller. The housing is mounted to a wall near or at the handwashing station. The sensor is disposed at least partially within the housing and is configured to detect movement of a user at the handwashing station. The speaker is disposed at least partially within the housing and configured to play music. The display unit is disposed at least partially within the housing and is configured to display a handwashing time period. The controller is in communication with the sensor, the speaker and the display unit. The controller is configured to activate the display unit and the speaker once the sensor detects movement of the user at the handwashing station.

A safe-wash device to assist in washing hands at a handwashing station. The safe-wash device includes a housing, a sensor, a speaker, a display unit and a controller. The housing is mounted to a wall near or at the handwashing station. The sensor is disposed at least partially within the housing and is configured to detect movement of a user at the handwashing station. The speaker is disposed at least partially within the housing and configured to play music. The display unit is disposed at least partially within the housing and is configured to display a handwashing time period. The controller is in communication with the sensor, the speaker and the display unit. The controller is configured to activate the display unit and the speaker once the sensor detects movement of the user at the handwashing station.

A system for generating a visual home exterior alert in response to a home alarm, typically audio, including a light switch override portion operationally connected to a light switch for controlling outside lighting, and a listening portion positioned to detect an alarm sound. Upon detection of a predetermined alarm sound, the listening portion is actuated to send an enabling signal to the light switch override portion. Upon receipt of the enabling signal, the light switch override portion sequentially energizes and deenergizes the outside lighting in a predetermined pattern.

The present invention relates to an electric shock warning distribution system. The electric shock warning distribution system of the present invention may include: a distribution board; and a wearable device configured to monitor bioelectric currents flowing through the body of an operator that operates the distribution board, classify degrees of hazard of the operator according to values of the monitored bioelectric currents, and to warn the operator of levels of electric shock hazard situations according to the classified degrees of hazard, wherein the wearable device is worn by each operator, each wearable device transmits, to other wearable devices located nearby, a warning message that warns other operators of an electric shock hazard situation when the operator is in the hazard situation, and the distribution board receives information on an electric shock hazard situation from each wearable device to warn the hazard situation of the operator.

The present invention relates to an electric shock warning distribution system. The electric shock warning distribution system of the present invention may include: a distribution board; and a wearable device configured to monitor bioelectric currents flowing through the body of an operator that operates the distribution board, classify degrees of hazard of the operator according to values of the monitored bioelectric currents, and to warn the operator of levels of electric shock hazard situations according to the classified degrees of hazard, wherein the wearable device is worn by each operator, each wearable device transmits, to other wearable devices located nearby, a warning message that warns other operators of an electric shock hazard situation when the operator is in the hazard situation, and the distribution board receives information on an electric shock hazard situation from each wearable device to warn the hazard situation of the operator.