Abstract: The present disclosure provides a microphone, comprising a vibration pickup assembly configured to generate vibration; at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal; at least one sampling module configured to convert electrical signals output by different acoustoelectric conversion elements of the at least two acoustoelectric conversion elements into digital signals, wherein, each of the at least two acoustoelectric conversion element has a resonant frequency, and a difference between resonant frequencies of two of the at least two acoustoelectric conversion elements is greater than 1000 Hz.

Abstract: The present application relates to an LED epitaxial structure and the preparation method and application thereof. The LED epitaxial structure comprises a first multiple-quantum-well light-emitting layer and a second multiple-quantum-well light-emitting layer. The first multiple-quantum-well light-emitting layer comprises a first shoes layer, a first well layer, a first cap layer, and a first Barrier layer epitaxially grown from bottom to top in sequence. The second multiple-quantum-well light-emitting layer comprises a second shoes layer, a second well layer, a second cap layer, and a second Barrier layer epitaxially grown from bottom to top in sequence. The technical solutions disclosed in the present application can solve the problem that the 365 nm to 375 nm wave band LED would emit yellow light.

Abstract: The present disclosure provides a microphone, comprising a shell structure, a vibration pickup assembly, a vibration pickup assembly, wherein the vibration pickup assembly is accommodated in the shell structure and generates vibration in response to an external sound signal transmitted to the shell structure, and at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal, wherein the at least two acoustoelectric conversion elements have different frequency responses to the vibration of the vibration pickup assembly.

Abstract: System and method for alarm processing are provided. The system may include a plurality of security devices. The plurality of security devices may be divided into at least one group. One group of the at least one group may include a first security device and one or more second security devices. The first security device may receive, from the one or more second security devices, one or more first alarms generated by the one or more second security devices. The first security device may determine that an alarm condition is satisfied based at least on one of the one or more first alarms and one or more second alarms generated by the first security device. The first security device may send, based on the determination, at least one of the one or more first alarms and the one or more second alarms to a user terminal.

Abstract: System and method for alarm processing are provided. The system may include a plurality of security devices. The plurality of security devices may be divided into at least one group. One group of the at least one group may include a first security device and one or more second security devices. The first security device may receive, from the one or more second security devices, one or more first alarms generated by the one or more second security devices. The first security device may determine that an alarm condition is satisfied based at least on one of the one or more first alarms and one or more second alarms generated by the first security device. The first security device may send, based on the determination, at least one of the one or more first alarms and the one or more second alarms to a user terminal.

Abstract: A system and method for controlling network congestion are provided. The method may include one or more of the following operations. One or more alert signals corresponding to one or more alert events of one or more urgency levels may be obtained at a first time of interest. A network condition of the network at the first time of interest may be obtained. A congestion assessment (CGA) at the first time of interest may be performed based on the network condition. A first communication protocol for sending the one or more alert signals may be determined based on the CGA. A first batch of alert signals of the one or more alert signals may be caused, based on the first communication protocol and the urgency levels of the one or more alert signals, to be sent via the network.

Abstract: A system and method for controlling network congestion are provided. The method may include one or more of the following operations. One or more alert signals corresponding to one or more alert events of one or more urgency levels may be obtained at a first time of interest. A network condition of the network at the first time of interest may be obtained. A congestion assessment (CGA) at the first time of interest may be performed based on the network condition. A first communication protocol for sending the one or more alert signals may be determined based on the CGA. A first batch of alert signals of the one or more alert signals may be caused, based on the first communication protocol and the urgency levels of the one or more alert signals, to be sent via the network.