An exemplary method includes a computing system receiving an audio message generated by a first device, determining a physical location of the first device when the audio message is generated, and associating the audio message with the physical location. The method further includes the computing system identifying a target recipient of the audio message, identifying a second device associated with the target recipient, and providing, based on a proximity of the second device to the physical location, the audio message to the second device.

A method for implementing a many-to-one concurrent transmission medium access control (MAC) protocol for underwater acoustic networks, including: initializing a network; setting a timer; initiating, by a receiving node, a control frame to perform handshakes with multiple nodes; exchange ID, level and location of the receiving node and a sending node, and counting the number of nodes that generate a sending notification (SN) message before timeout; and planning, by the receiving node, a receiving scheduling time of data from different nodes according to the number of successful handshake nodes, distance from each sending node to the receiving node, and data packet size; and performing data transmission.

A method for implementing a many-to-one concurrent transmission medium access control (MAC) protocol for underwater acoustic networks, including: initializing a network; setting a timer; initiating, by a receiving node, a control frame to perform handshakes with multiple nodes; exchange ID, level and location of the receiving node and a sending node, and counting the number of nodes that generate a sending notification (SN) message before timeout; and planning, by the receiving node, a receiving scheduling time of data from different nodes according to the number of successful handshake nodes, distance from each sending node to the receiving node, and data packet size; and performing data transmission.

Organism monitoring systems and devices and associated monitoring methods are described. According to one aspect, an organism monitoring device configured to be associated with an organism to be monitored includes a housing, a battery coupled with the housing, wherein the battery is configured to store electrical energy, a transmitter coupled with the housing and the battery, wherein the transmitter is configured to emit a wireless signal externally of the organism monitoring device and the organism being monitored, sensor circuitry coupled with the housing and the battery, wherein the sensor circuitry is configured to monitor an environment of the organism monitoring device, and control circuitry coupled with the housing, the sensor circuitry and the battery, and wherein the control circuitry is configured to adjust an operation of the organism monitoring device as a result of monitoring of the environment of the organism monitoring device by the sensor circuitry.

A method for operating a bone conduction communication system can include establishing a communicable connection, operating a transducer in an input mode wherein the bone conduction transducers are configured to detect a vibration associated with a bone of the user; transmitting an audio signal over the communicable connection; and operating the transducers responsive to the audio signal.

In one example, a server obtains an indication that a first mobile device is in a predetermined proximity to a non-mobile device. In response, the server permits the first mobile device to pair with the non-mobile device. The server generates whitelisted information associated with the first mobile device by adding information associated with the first mobile device to a whitelist that controls mobile device pairing for the non-mobile device. The server also obtains an indication that a given mobile device has obtained one or more keep-alive messages from the non-mobile device. Based on the whitelisted information, the server determines whether to permit the given mobile device to pair or remain paired with the non-mobile device. In response to determining to permit the given mobile device to pair or remain paired with the non-mobile device, the server permits the given mobile device to pair or remain paired with the non-mobile device.

In one example, a server obtains an indication that a first mobile device is in a predetermined proximity to a non-mobile device. In response, the server permits the first mobile device to pair with the non-mobile device. The server generates whitelisted information associated with the first mobile device by adding information associated with the first mobile device to a whitelist that controls mobile device pairing for the non-mobile device. The server also obtains an indication that a given mobile device has obtained one or more keep-alive messages from the non-mobile device. Based on the whitelisted information, the server determines whether to permit the given mobile device to pair or remain paired with the non-mobile device. In response to determining to permit the given mobile device to pair or remain paired with the non-mobile device, the server permits the given mobile device to pair or remain paired with the non-mobile device.

In an acoustic wave device, an antenna end resonator that is electrically closest to a first terminal is a first acoustic wave resonator. In each of the first acoustic wave resonator and a second acoustic wave resonator, a thickness of a piezoelectric layer is about 3.5λ or less when a wavelength of an acoustic wave is denoted as λ. The first acoustic wave resonator and the second acoustic wave resonator satisfy at least one of a first condition, a second condition, and a third condition. The first condition is a condition that the first acoustic wave resonator further includes a dielectric film provided between the piezoelectric layer and an interdigital transducer electrode, and the second acoustic wave resonator does not include the dielectric film.

In an acoustic wave device, an antenna end resonator that is electrically closest to a first terminal is a first acoustic wave resonator. In each of the first acoustic wave resonator and a second acoustic wave resonator, a thickness of a piezoelectric layer is about 3.5λ or less when a wavelength of an acoustic wave is denoted as λ. The first acoustic wave resonator and the second acoustic wave resonator satisfy at least one of a first condition, a second condition, and a third condition. The first condition is a condition that the first acoustic wave resonator further includes a dielectric film provided between the piezoelectric layer and an interdigital transducer electrode, and the second acoustic wave resonator does not include the dielectric film.

A communication unit for an electrical machine, in particular a hand-held machine tool, includes at least one electrical actuator, a control unit configured to control the at least one electrical actuator, and a receiving unit assigned to a mobile or stationary unit. The at least one electrical actuator and the control unit together form a transmission unit. The transmission unit is configured to transmit data, and the receiving unit is configured to receive the data. The receiving unit includes at least one microphone. To transmit data, via the transmission unit, the control unit is configured to trigger the electrical actuator to generate an acoustic signal that is detectable by the at least one microphone.