11 results about "Time synchronization" patented technology

A computer implemented method and apparatus utilizing a multi-diversity synchronization technique for improving time synchronization in wireless applications, such as TDMA applications is disclosed. The multi-diversity synchronization technique utilizes cross-correlations between multiple diverse received signals to determine relative offsets between the signals. The signals are then time aligned. An absolute synchronization word location is determined using the time aligned signals and is used along with the relative offsets to determine respective synchronization word locations for each received signal in an accurate, efficient and improved manner.

A network device is provided, which includes a communication unit and a processing unit. The communication unit is configured to perform a time setting process with a master clock device. The processing unit is coupled to the communication unit and is configured to control the communication unit to perform a time synchronization process for obtaining a time offset of the network device relative to the master clock device. The processing unit is further configured to calculate a processing time elapsed during the time synchronization process and obtain a correction time by calculating the system time of the network device, the time offset and the processing time.

Disclosed is a time-synchronization algorithm for use among disparate systems, such as between a controller system and a system having one or more application workstations. In an embodiment of the invention, the workstation system acts as a master timekeeper, ensuring that the time stored in the controller system is in synchrony with the time kept by the workstation system. In a further embodiment of the invention, the time-synchronization system provides staggered time-synchronization signals from each of two or more workstations for receipt by the controller system. The controller system sets its local time by resetting the time for each such incoming synchronization signal. In a further embodiment of the invention, each of two or more workstations employs a technique for evaluating the error accumulated in the controller's time clock and transmits a time-synchronization message in response to finding that the accumulated error has exceeded a predetermined acceptable error threshold.

The invention relates to a realization method and device of 360-DEG circular screen projection. Video signals output by four video players are synchronized through a time synchronization server and then sent to a projection fusion machine to be fused, and then respectively projected to a circular screen by four corresponding projectors to form the seamless mosaic. The method and device provided by the invention can be used for realizing the experience of a three-dimensional film in an experience hall. When standing in the 360-DEG circular screen, users can experience the realistic feel through the video image in the circular screen, as if the users visit houses in real environment.

The invention relates to the field of avionics system time synchronization methods, in particular to an avionics integrated test time synchronization system based on a satellite simulator and a synchronization method thereof.The system comprises a multi-system satellite navigation simulator, a satellite navigation antenna, an anti-interference processor, a comprehensive task processor and testing and excitation/simulation equipment; the method comprises the following specific steps: S1, a time frequency module of the multi-system satellite navigation simulator receives external clock input; s2, outputting a 1PPS (pulse per second) signal; s3, the anti-interference processor transmits the time signal to a comprehensive task processor in a second pulse signal or high-speed RS-422 data form; s4, the comprehensive task processor transmits the time signal to the airborne avionics equipment through the FC optical fiber bus and the GJB289A bus; time synchronization between avionics system products, between joint test environment devices and between products and devices is achieved, and timeliness of information interaction and software scheduling and synchronism of data recording are effectively guaranteed.

The invention discloses a time synchronization method. An agent module in the client acquires video file data from a video data server according to a video playback request of a video live APP, the video file data returned by the video data server are then received, the time information carried in the video file data is analyzed, and the time information and the video file data are synchronously transmitted to the video live APP. As the video file data carry the time information inserted by the video data server and the time information is consistent with the current time of the video data server, the scheme can reduce the time error between the client providing the video live service and the video server on the premise when the server does not need to perform additional interaction with the client, the time display accuracy in the client is improved, and better use experience is provided for the user.

The invention relates to the technical field of multimedia information publishing, and discloses a method for realizing synchronous playing of a multimedia display terminal, which comprises the following steps of: enabling a multimedia information publishing cloud server circularly to play a program from the starting time A of a current task, wherein the program comprises a plurality of materials,and the total program playing duration is T1; from the beginning of the playing of the first material to the last material of the program as a round of program, playing in a list loop playing mode; carrying out time synchronization on the plurality of multimedia display terminals and a multimedia information publishing cloud server; calculating the played duration of the current round of program;calculating materials needing to be played currently in the current round of programs; calculating the played duration of the material needing to be played currently in the current round of program;and calculating the playing time point of the material needing to be played currently in the current round of program. According to the technical scheme of the invention, a plurality of multimedia display terminals can start to play completely and synchronously at any time point.

The invention discloses a system and a method for improving LoRa network throughput. The system comprises an STM32 controller, a battery connected with the STM32 controller, a LoRa module connected with the STM32 controller, a LoRa gateway connected with the LoRa module, and an upper computer connected with the LoRa gateway. The upper computer provides time service for the terminal nodes through the LoRa gateway, and the STM32 controller uses the timer and the real-time clock to solve the problem of time synchronization of multiple nodes according to the current time.