43results about How to "Reduce time synchronization requirements" patented technology

The invention discloses a visible light communication method, sending device, receiving device and system. A sending end for visible light communication enables transmitted communication information to be modulated line by line to an original image signal to generate modulation image signals, and the modulation image signals are displayed in a line-by-line scanning manner; and a receiving end for visible light communication collects the modulation image signals, scans the modulation image signals line by line and demodulates the communication information in the modulation image signals. According to the technical scheme, the transmitted communication information is modulated to the original image signal line by line to generate the modulation image signals, and then, the modulation image signals are displayed in a line-by-line scanning manner, so that when the transmitted communication information is demodulated, the transmitted communication information of the lines can be demodulated as long as the lines in the modulation image signals are collected without capturing a complete image frame, and requirement for time synchronization of the visible light communication system can be reduced.

The invention belongs to the technical field of indoor positioning, and discloses an audio positioning method based on emission angle estimation. At least two base stations with known position information and attitude information are arranged, and each base station is equipped with an array of sound source emitters. The array includes several sound source transmitters that transmit sound signals in different directions; each base station continuously transmits sound signals with identification codes through the sound source transmitters, and the identification codes of the sound signals emitted by different sound source transmitters are uniquely determined and Different from each other; the receiving end receives all sound signals from all base stations, and demodulates the sound signals to obtain the angular probability distribution between the receiving end and the base station; according to the angular probability distribution, the best spatial estimation corresponding to the receiving end and each base station is obtained Angle: According to the best spatial estimation angle in the base station coordinate system, the position information and attitude information of the base station, the spatial position of the receiving end is obtained. The invention solves the problem of low accuracy of indoor positioning.

The embodiment of the present invention discloses an authentication method, device and storage medium. The method includes the terminal sending the first authentication request message carrying the token to the server; the server sending the first authentication response message to the terminal; Text, the second authentication request message of the target dynamic password is sent to the server, the target dynamic password is encrypted from the local registration parameters, original key and sequence data of the terminal, and the sequence ciphertext is encrypted from the sequence data; the server will carry the second authentication result of the authentication result The response message is sent to the terminal, and the authentication result is used to indicate that the target dynamic password is authenticated according to the serial ciphertext, the server's local original key and registration parameters. Symmetric key function and HMAC technology can be used for registration and authentication between the server and the terminal, which can increase the calculation speed and reduce the time and space overhead. The sequence data has low requirements for time synchronization, and is suitable for cross-border and cross-regional terminals and Authentication of the server.

As shown in FIG. 7, a data receiver receives video data and audio data together with a frequency division parameter N that depends on the pixel clock of the video data and the sampling frequency of the audio data, and a count value CTS that is obtained by counting the period of the audio clock that has been subjected to frequency division by the frequency division parameter N, with the pixel clock, which are transmitted from a data transmitter, and subjects the pixel clock to frequency division by the count value CTS, phase-control the divided clock (s501) in accordance with a phase comparison clock (s505) that is obtained by dividing an audio clock (s403) oscillated from a VCO (504) by the frequency division parameter N, thereby generating an audio clock (s403).Accordingly, the data transmitter and the data receiver can satisfactorily implement multiplexing of audio data and video data, and transmission of the multiplexed data using an existing DVI cable, with a simple structure.

The present invention relates to a satellite optical burst switching conflict resolution scheduling implementation system and method, according to the network topology of the space-based broadband transmission backbone network and the status of each switching node, through the scheduling mode of pre-allocation of network resources, in the space-based broadband transmission backbone network The boundary controls the data that will enter the space-based broadband transmission backbone network for transmission and exchange, pre-plans the exchange time and forwarding path of each optical burst data entering the space-based broadband transmission backbone network, and realizes the optical burst data exchange of the space-based broadband transmission backbone network conflict resolution scheduling. The optical burst data of the space-based broadband transmission backbone network is generated by the electrical domain. After the electrical-optical conversion is completed at the edge node of the backbone network, it enters the backbone network for optical burst exchange. After reaching the destination edge node, the optical-electrical conversion is completed, and then the data is sent to the processing terminal. , to complete the data routing exchange process. The system utilizes network resources to resolve conflicts in satellite optical burst switching through pre-planning and scheduling.