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.

Doorbells can send data to each other to enable a first doorbell user to warn a second doorbell user regarding a suspicious visitor. A first user can indicate a first trait of a visitor via a first remote computing device. The first user can create a user group to enable the members of the user group to use their doorbells to take pictures of suspicious visitors and to send the pictures of the suspicious visitors to other members of the user group.

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.

Doorbells can send data to each other to enable a first doorbell user to warn a second doorbell user regarding a suspicious visitor. A first user can indicate a first trait of a visitor via a first remote computing device. The first user can create a user group to enable the members of the user group to use their doorbells to take pictures of suspicious visitors and to send the pictures of the suspicious visitors to other members of the user group.

A service request system comprises: a call bell device transmitting service request information in response to a customer's input; a first gateway device receiving the service request information through a local area communication; a service server connected to the first gateway device over an Internet and, in an online status, receiving the service request information from the first gateway device through the Internet; a staff terminal connected to the service server over the Internet and receiving the service request information from the service server through the Internet; a local server connected to the first gateway device and the staff terminal over the local area communication, monitoring availability of the Internet and, in an offline state, receiving the service request information of the call bell device from the first gateway device and transmitting the service request information of the call bell device to the staff terminal through the local area communication.

The invention relates to a method for dynamic model-based ringer profiles. The method includes receiving one or more incoming calls, and, based on the one or more incoming calls, generating one or more incoming call records. Each of the incoming call records includes an elapsed ringing time value associated with one of the incoming calls. Also, the method includes storing one or more ringer profiles. The ringer profiles are generated using the one or more incoming call records. The ringer profiles include a current ringer profile. Further, the method includes receiving a new incoming call, and, in response to receiving the new incoming call, sounding a ringtone according to the current ringer profile.

Doorbells can send data to each other to enable a first doorbell user to warn a second doorbell user regarding a suspicious visitor. A first user can indicate a first trait of a visitor via a first remote computing device. The first user can create a user group to enable the members of the user group to use their doorbells to take pictures of suspicious visitors and to send the pictures of the suspicious visitors to other members of the user group.

The invention relates to a method for dynamic model-based ringer profiles. The method includes receiving one or more incoming calls, and, based on the one or more incoming calls, generating one or more incoming call records. Each of the incoming call records includes an elapsed ringing time value associated with one of the incoming calls. Also, the method includes storing one or more ringer profiles. The ringer profiles are generated using the one or more incoming call records. The ringer profiles include a current ringer profile. Further, the method includes receiving a new incoming call, and, in response to receiving the new incoming call, sounding a ringtone according to the current ringer profile.

A system for alterting heathcare practitioners (20) includes a plurality of receiving devices (10), and a sending station (30). Each of the plurality of receiving device is associated with a corresponding healthcare practitioner. The receiving device (10) includes a user alerting device (120), a receiver (110), and circuitry (160). The user alerting device (120) alerts the practitioner to a received message with one of a plurality of types of alerts. The receiver (110) receives the incoming messages. The circuitry (160) causes the user alerting device to alert the practitioner to an incoming message with one of the plurality of types of alerts. The sending station (30) sends the messages carrying healthcare information of one of a plurality of preselected types of healthcare significants to a selected one or more of the receiving devices, each message corresponding to a selected one of the types of alerts, such that the receiving device alerts the practitioner to receiving the message with the selected type of alerts.

Doorbells can send data to each other to enable a first doorbell user to warn a second doorbell user regarding a suspicious visitor. A first user can indicate a first trait of a visitor via a first remote computing device. The first user can create a user group to enable the members of the user group to use their doorbells to take pictures of suspicious visitors and to send the pictures of the suspicious visitors to other members of the user group.