A signal e(z) obtained by subtracting echo-canceling sound from an output of a second microphone is used as an error of an echo cancellation adaptive filter and a noise cancellation adaptive filter, and an output of a first sound source device is added to the signal e(z) and output from a first speaker. The echo cancellation adaptive filter generates echo-canceling sound from an addition signal of the output of the second sound source device and the output of the first microphone such that the signal e(z) is minimized. The noise cancellation adaptive filter generates the noise-canceling sound from the output of the first sound source device such that the signal e(z) is minimized, and outputs the noise-canceling sound from the second speaker.

Systems and methods for volume control over intercom trunk lines. One example method includes receiving, from a first keypanel coupled to a first intercom, a call request identifying a remote keypanel coupled to a second intercom. The method includes transmitting a trunk request based on the call request and receiving a trunk setup message. The method includes activating a first crosspoint to provide a two-way audio connection between the first and second intercom devices. The method includes applying a trunk gain value to the first crosspoint based on the remote keypanel and transmitting, with an audio gain based on the trunk gain value, an audio stream received from the first keypanel. The method includes receiving, from the second intercom, a gain adjustment value associated with the first keypanel and the remote keypanel and applying an adjusted trunk gain value to the first crosspoint based on the gain adjustment value.

Systems and methods for volume control over intercom trunk lines. One example method includes receiving, from a first keypanel coupled to a first intercom, a call request identifying a remote keypanel coupled to a second intercom. The method includes transmitting a trunk request based on the call request and receiving a trunk setup message. The method includes activating a first crosspoint to provide a two-way audio connection between the first and second intercom devices. The method includes applying a trunk gain value to the first crosspoint based on the remote keypanel and transmitting, with an audio gain based on the trunk gain value, an audio stream received from the first keypanel. The method includes receiving, from the second intercom, a gain adjustment value associated with the first keypanel and the remote keypanel and applying an adjusted trunk gain value to the first crosspoint based on the gain adjustment value.

Methods and systems for granting access to a building are disclosed. The system includes a telephone entry system associated with the building, a processor in communication with the telephone entry system, a non-transitory computer readable medium. The non-transitory computer-readable medium includes one or more programming instructions that when executed by the processor, cause the processor to receive a request including an access code for access to the building code, determine whether the access code is valid, and transmit to the telephone entry system associated with the building a sequence of dual-tone multi-frequency (DTMF) tones to cause the telephone entry system to grant access to the building in response to determining that the access code is valid.

A display control method performed using a system including an information processing server includes: (a) obtaining, using a sensor, a user state indicating whether a user is currently cooking using a cooker, when an image of a delivery person delivering an item to a building in which the user is present is captured by a camera provided at an entrance door of the building; (b) obtaining content information of the item; (c) obtaining at least one suggestion associated with the user state and the content information of the item; and (d) causing a display terminal provided in the building to display the image of the delivery person, the content information of the item, and the at least one suggestion. Here, (a) to (d) are performed by the information processing server.

An electronic device includes a proximity sensor, a communication interface that communicates with an indoor unit of an intercom, and a controller. When the communication interface acquires a signal indicating receipt of a call notification by the indoor unit of the intercom, the controller executes processing to control the indoor unit of the intercom based on a gesture detected by the proximity sensor. An electronic device includes a proximity sensor, a communication interface that communicates with an outdoor unit of an intercom, and a controller. When the communication interface acquires a call notification from the outdoor unit of the intercom, the controller executes processing to control the outdoor unit of the intercom based on a gesture detected by the proximity sensor.

A doorbell system (1) includes a plurality of doorbells (2-1 to 2-n) each of which is attached to each residence and includes an operation unit (22) and a camera (26), and a control unit (4) capable of performing communication with the plurality of doorbells (2-1 to 2-n). The control unit (4) is configured to acquire position information of each of the plurality of doorbells (2-1 to 2-n) and an image captured by the camera (26), to generate target information about a target, based on the position information and the image, and to transmit the target information to an external device (3-1 to 30n) associated with a specific user.

A doorbell system (1) includes a plurality of doorbells (2-1 to 2-n) each of which is attached to each residence and includes an operation unit (22) and a camera (26), and a control unit (4) capable of performing communication with the plurality of doorbells (2-1 to 2-n). The control unit (4) is configured to acquire position information of each of the plurality of doorbells (2-1 to 2-n) and an image captured by the camera (26), to generate target information about a target, based on the position information and the image, and to transmit the target information to an external device (3-1 to 30n) associated with a specific user.

An intercom network for real-time audio communication between users has a stationary element to which the users are connected, a mobile terminal that comprises an audio input and that can transmit audio signals wirelessly to the stationary element or to another user, and a device in the stationary element for user management, that administers the users connected to the stationary element, and that carries out an authorization check for logging the mobile terminal onto the stationary element. An NFC element is provided in the device on the stationary element, and an NFC counter-element is provided on the mobile terminal that can transmit authorization information to the NFC element when the mobile terminal approaches the stationary element.

An intercom network for real-time audio communication between users has a stationary element to which the users are connected, a mobile terminal that comprises an audio input and that can transmit audio signals wirelessly to the stationary element or to another user, and a device in the stationary element for user management, that administers the users connected to the stationary element, and that carries out an authorization check for logging the mobile terminal onto the stationary element. An NFC element is provided in the device on the stationary element, and an NFC counter-element is provided on the mobile terminal that can transmit authorization information to the NFC element when the mobile terminal approaches the stationary element.