Zhejiang Dahua Technology Co., Ltd.

Zhiji Deng

Ming Liu

Yongjun Fang

Fei Wang

Xiang Li

Miao Cheng

Guoquan Zhang

Jinbiao Shu

Qifeng Zhu

Qi Ye

Xingyu Xu

Jinyu Zhang

Yuxiang He

A method may include obtaining parameter information of a plurality of acquisition devices that communicate with the system to transmit video data to the system. The parameter information of each of the plurality of acquisition device may include transmission information of a target key frame of the video data of the acquisition device. The method may also include determining, based on the parameter information, whether there are collision key frames in the target key frames of the plurality of acquisition devices. The method may also include adjusting an original generation time of at least one of the collision key frames in response to determining that there are collision key frames, so that after the adjustment, there is no collision key frame in the target key frames of the plurality of acquisition devices.

Systems and methods for data transmission

The present disclosure relates to a polarity correction circuit. The polarity correction circuit may include a detection module and a switching module. The detection module may be configured to detect a polarity of a DC voltage transmitted to a powered device and generate one or more control signals based on the polarity of the DC voltage. The switching module may be configured to receive the one or more control signals and a data signal transmitted from the powered device. The switching module may be further configured to adapt a polarity of the data signal based on the one or more control signals such that the polarity of the data signal is accordant with the polarity of the DC voltage.

System and method for adapting a polarity of a data signal

Systems and methods for analyzing a diffusion trend of a diffusible substance. The systems may obtain a plurality of sets of reference information relating to the diffusible substance from a plurality of devices respectively, each of the plurality of sets of reference information at least including a time point when a corresponding device detects the diffusible substance and a location where the device detects the diffusible substance. The plurality of sets of reference information may correspond to a same or a substantially same time domain. The systems may determine the diffusion trend of the diffusible substance based on the plurality of sets reference information.

Systems and methods for analyzing diffusion trend of diffusible substance

System and method for determining a 3D coordinate of a moving target are provided. The system may obtain 2D detection data of the moving target generated by a 2D detection device including two detection assemblies that are mounted at a known height above a horizontal plane along a first axis that forms a tilting angle with the horizontal plane. The system may determine a 2D coordinate of the moving target in a first coordinate system including the first axis and a second axis that is perpendicular to the first axis based on the 2D detection data. The 2D coordinate of the moving target may include a first value of the first axis and a second value of the second axis. The system may determine the 3D coordinate of the moving target in a second coordinate system based on the 2D coordinate, the tilting angle, and the known height.

Radar systems and methods using the same

Systems and methods for determining a time difference are provided in the present disclosure. The systems includes a first base station configured to receive a first signal transmitted from a terminal and receive a second signal from a second base station. The systems may also include the second base station configured to receive the first signal transmitted from the terminal, and transmit the second signal after receiving the first signal. The systems may further include at least one processor configured to determine a time duration between the first base station receiving the first signal and receiving the second signal and determine the time difference between a first time period of the first signal transmitted from the terminal to the first base station and a second time period of the first signal transmitted from the terminal to the second base station based on a third time period and the time duration.

Systems and methods for determining position and distance of a terminal

The present disclosure relates to systems and methods for establishing connection between devices. One or more first parameters relating to a first device may be determined. The first device may have a first operation mode and a second operation mode. The one or more first parameters may include a duration of the first operation mode and a duration of the second operation mode. One or more second parameters relating to a second device may be determined. The second device may have a third operation mode. The one or more second parameters relating to the second device may include a duration of the third operation mode. A connection between the first device and the second device may be established based on the one or more first parameters and the one or more second parameters.

System and method for establishing connection between devices

The present disclosure relates to a converter. The converter may include a first connector configured to transmit one or more signals, a second connector configured to receive the one or more signals, a first cable with a first impedance, a second cable with a second impedance, and an impedance module. The first connector may be connected to the impedance module via the first cable. The second connector may be connected to the impedance module via the second cable. The impedance module may be configured to convert the first impedance of the first cable to the second impedance of the second cable such that the one or more signals are transmitted from the first connector to the second connector via the first cable and the second cable.

Power over ethernet system, device, and method

A signal processing circuit for dynamically processing an analog signal. The signal processing circuit may include a detection module and a fluctuation filter module. The detection module may be configured to detect a voltage of a first sub-signal of a first frequency band of the analog signal in real time and transmit a first control signal when the voltage of the first sub-signal is out of a first preset voltage range. The fluctuation filter module may be configured to remove a second sub-signal of a second frequency band of the analog signal from the analog signal upon receiving the first control signal. The second frequency band may cover the first frequency band.

System and method for mixed transmission of signals and power supply through a single cable

A system and method for filling light for signal communication are provided. The system may include at least one transmission controller. The at least one transmission controller may include a closed loop suppression module coupled to a node and a Video Output, wherein the Video Output is configured to output a reverse control signal, the node is coupled to the Video Output and is configured to receive the reverse control signal, and the closed loop suppression module is configured to: receive the reverse control signal, and adjust at least one of a voltage of the node or a voltage of the Video Output according to the voltage of the reverse control signal.

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Hangzhou, China

Zhiji Deng