According to an embodiment, a first device includes: a first transceiver configured to transmit two or more first carrier signals using an output of a first reference signal source and to receive two or more second carrier signals; and a calculation unit, and a second device includes: a second transceiver configured to transmit the two or more second carrier signals using an output of a second reference signal source that operates independently of the first reference signal source and to receive the two or more first carrier signals. A frequency group of the two or more first carrier signals and a frequency group of the two or more second carrier signals are identical or substantially identical to each other, and the calculation unit calculates the distance between the first device and the second device based on a phase detection result obtained by receiving the first and second carrier signals.

Systems and methods of user code synchronization with Z-wave door locks are provided. Methods can include determining an occurrence of a predetermined event, upon the occurrence of the predetermined event, identifying a set of a plurality of user codes stored in a control panel to be synchronized, and wirelessly transmitting the set of the plurality of user codes to be synchronized from the control panel to at least one door lock using a Z-wave communications protocol.

A circuit device is used in an electronic device including a receiver, a control circuit that performs processing on reception data received by the receiver using a clock signal, a transmitter that transmits transmission data generated by performing processing based on the reception data by the control circuit. The circuit device includes a time-to-digital conversion circuit that measures a time difference between a transition timing of a start signal based on the reception data and a transition timing of a stop signal based on the transmission data or the clock signal, and an output interface that outputs, to the control circuit, a measurement result of the time difference of the time-to-digital conversion circuit.

Provided is a method for authenticating users on a packaging industrial system having at least two operator interfaces, including the following steps: login of a user to a personal portable item, wherein the personal item including a memory with login credentials of the user for the at least two operator interfaces, wherein login credentials for the operator interfaces being different from each other, activation of the memory for a period of time, detecting the user when he is in a predefined spatial area around the operator interfaces, connecting the personal item to an operator interface when the user is detected in the associated spatial area, authentication of the user at this operator interface with the login credentials stored in the memory via the connection of the personal item to the operator interface.

[Object] To provide a novel and improved communication system and communication device that make it possible to reduce an amount of time from when communication with an external device is completed to when communication data corresponding to a communication result is output to another device.

[Solution] Provided is a communication system including: a communication device configured to transmit a selection solution that is selected depending on a result of first communication with an external device; and a control device configured to receive the selection solution from the communication device through second communication between the communication device and a communication partner that is different from the external device serving as a communication partner in the first communication.

A method performed by a system of one or more computers for operating a virtual entry system for a building. The method includes receiving, from a mobile device, a selection associated with information related to a navigation interface. The method includes sending, to the mobile device in response to receiving the selection, information related to a communication interface, the information related to the communication interface including a meeting code. The method includes receiving, from the mobile device, a first request to initiate a communication session between the mobile device and an electronic device, the first request including the meeting code. The method includes initiating, based on the first request, a communication session between the mobile device and the electronic device. The method includes receiving a second request to unlock a door of the building in response to the communication session.

A security system can include an electronic doorbell comprising a first camera configurable to capture an image of a first zone, a button configurable to enable a visitor to sound an electronic chime, and a first microphone configurable to capture sounds. The security system can also include an electronic garage door controller communicatively coupled to the electronic doorbell, the electronic garage door controller comprising a second camera configurable to capture an image of a second zone, and a second microphone configurable to capture sounds. The security system can also include a remote computing device communicatively coupled to at least one of the electronic doorbell and the electronic garage door controller. The remote computing device can be configurable to display at least one of the image of the first zone and the image of the second zone.

A circuit device is used in an electronic device including a receiver, a control circuit that performs processing on reception data received by the receiver using a clock signal, a transmitter that transmits transmission data generated by performing processing based on the reception data by the control circuit. The circuit device includes a time-to-digital conversion circuit that measures a time difference between a transition timing of a start signal based on the reception data and a transition timing of a stop signal based on the transmission data or the clock signal, and an output interface that outputs, to the control circuit, a measurement result of the time difference of the time-to-digital conversion circuit.

A method performed by a system of one or more computers for operating a virtual entry system for a building. The method includes receiving, from a mobile device, a selection associated with information related to a navigation interface. The method includes sending, to the mobile device in response to receiving the selection, information related to a communication interface, the information related to the communication interface including a meeting code. The method includes receiving, from the mobile device, a first request to initiate a communication session between the mobile device and an electronic device, the first request including the meeting code. The method includes initiating, based on the first request, a communication session between the mobile device and the electronic device. The method includes receiving a second request to unlock a door of the building in response to the communication session.

A security system can include an electronic doorbell comprising a first camera configurable to capture an image of a first zone, a button configurable to enable a visitor to sound an electronic chime, and a first microphone configurable to capture sounds. The security system can also include an electronic garage door controller communicatively coupled to the electronic doorbell, the electronic garage door controller comprising a second camera configurable to capture an image of a second zone, and a second microphone configurable to capture sounds. The security system can also include a remote computing device communicatively coupled to at least one of the electronic doorbell and the electronic garage door controller. The remote computing device can be configurable to display at least one of the image of the first zone and the image of the second zone.