32results about How to "Eliminate transmission delays" patented technology

A network master (M) having charge of an operation of a main device (L) and one or more network slaves (S1 to S3) each having charge of a safety determining device (A to C) for determining safety which is an operating permission condition of the main device (L) are connected on the network. Each network slave comprises means for selectively performing a first operation for transmitting information including data for maintenance of the safety determining device or both determination output of the safety determining device and data for maintenance of the safety determining device, to the network master and a second operation for transmitting information including the determination output of the safety determining device but not including the data for maintenance of the safety determining device at all or hardly including it to the network master. The first operation in the network slave is performed when the main device is in a stopped state and the second operation in the network slave is performed when the main device is in an operating state.

Provided is a stream signal transmission device that can eliminate transmission delay fluctuation with a fast change such as network jitter with high accuracy and synchronize a plurality of streams. The stream signal transmission device includes at least one reception unit that receives a stream signal to which a time code is attached from a network, at least one extraction unit that extracts the time code from the stream signal received by the reception unit, and at least one delay control unit that determines an output time by adding a predetermined fixed delay to a time indicated by the time code extracted by the extraction unit, and outputs the stream signal received by the reception unit after holding the stream signal up to the output time.

The present invention provides a polymer matrix composite, and a prepreg and a printed circuit board using the same. The polymer matrix composite includes a polymeric resin and a non-woven reinforcingmaterial having a dielectric constant of from about 1.5 to about 4.8 and a dissipation factor at 10 GHz below 0.003. The printed circuit board uses the laminate including the polymer matrix compositeas a core layer which is sandwiched between at least two outer layers. The disclosed polymer matrix composite, the laminate including the polymer matrix composite, the prepreg using the polymer matrix composite and the printed circuit board using the polymer matrix composite can effectively reduce transmission delay and weaving effects through adopting the specific non-woven reinforcing material.

Provided are a method and system for synchronizing a robot with a server. The service sends a time service command including a current time of the server to the robot, and the robot receives the time service command, so as to enable time synchronization of the robot with the server. A control device receives first command data carrying a first timestamp sent from the server, and then determines whether the first timestamp in the first command data has expired. If the first timestamp has expired, the control device receives command data resent from the server until second command data carrying an unexpired second timestamp is received. Finally, the control device controls the robot to execute a corresponding action at a time corresponding to the second timestamp based on the second command data, so as to realize the synchronization of the robot with the command data sent from the server.

Disclosed in the embodiment of the present invention are a method for coding thereof related device and communication system. In the embodiment of the present invention, DNCP(DNCP: Doublesource Network Coding Protocol) is provided for supporting coding and decoding between two signal sources, wherein, the coding device performs random linear coding to two IP packages whose arrival interval are smaller than the setting duration and the destination addresses are same, through this ,it is useful for partly eliminating the influence of mismatch of transmitting rate and transfer delay in the actual network; at the same time, the header of DNCP package carries two source IDs, two IP package IDs and coding coefficient vector information which is related to the coding coefficient vector, which lays the foundation for the coding device continuously to code multi times or for the decoding device to decode rapidly, and benefits improving the generality of network coding in the actual network; and as the present invention is carried out based on network coding technology, therefore it can make full use of network resource and increase the network throughout rate obviously and achieve higher transmission efficiency.

An object of the present invention is to provide means for eliminating a transmission delay when transmitting emergency information for the sake of relief, security, or the like in a wireless device in conformity with the wireless LAN standard in which if radio waves transmitted from peripheral devices are detected, transmission has to be stopped. In a multimode wireless communication scheme having two or more communication schemes, priorities of the communication schemes are set. A high priority or low priority regarding to a message is described in a “message type” data field of a frame of a controlling channel output from the access point side to the terminal side. When the frame of the controlling channel is decrypted on the terminal side, the message type is confirmed, so that the type of a service channel used thereafter is confirmed and the channel is coupled.

The invention relates to a video overlay device and method. The video overlay device includes a first dynamic video signal storage module for storing a dynamic video signal and transmitting the dynamic video signal to a storage control module; the storage control module for controlling the real-time storage of the dynamic video signal and transmitting the dynamic video signal to a second dynamic video signal storage module; the second dynamic video signal storage module for storing the dynamic video signal and transmitting the dynamic video signal to a video overlay module; a local video signal storage module for storing a local video signal and transmitting the local video signal to a video overlay module; the video overlay module for overlaying the dynamic video signal and the local video signal and transmitting the overlaid video signal to a display module; and the display module for receiving the overlaid video signal transmitted by the video overlay module and displaying the overlaid video signal.

The invention discloses a low-latency metadata access method of a cloud storage client, aiming to solve the problems of slow metadata access response and the like during metadata access. The technical proposal is as follows: a metadata access module composed of a metadata definition module, a metadata importing module, a metadata request response module and a metadata uploading module is mounted on the cloud storage client node; the metadata definition module determines the content and the format of the used metadata; the metadata importing module imports a metadata file into a key value pair database from the cloud storage server; the metadata request response module performs metadata operation according to a metadata access command; and the metadata uploading module uploads a local metadata file to the cloud storage server. Due to the adoption of the low-latency metadata access method provided by the invention, the network transmission latency of metadata access can be eliminated, the metadata server can be prevented from becoming performance bottleneck, the condition that the same cloud storage client node can access heteroid cloud storage systems is supported and the security of the metadata is improved.

The invention discloses a multichip synchronization structure based on a time-digital converter circuit. The multichip synchronization structure comprises N circuit chips provided with built-in time-digital converters and time sequence regulation modules. Each chip contains a synchronization indicating signal receiving end, a synchronization indicating signal output end, one time-digital converter and one time sequence regulation module, wherein the synchronization indicating signal receiving end is used for receiving a synchronization indicating signal input into the chip externally; the synchronization indicating signal output end is used for outputting a synchronization indicating signal subjected to time sequence resampling through a trigger in the chip, wherein the sampling frequency of the trigger is completely aligned with a time sequence of a maximum frequency clock; the time-digital converter is used for quantizing time sequence delays of two input signals into digital values, wherein the input signal IN1 is the synchronization indicating signal input into the chip externally, and the input signal IN2 is the synchronization indicating signal subjected to time sequence resampling through the trigger in the chip; and the time sequence regulation module is used for regulating output delays of the synchronization indicating signals according to the input digital values. By the adoption of a daisy chain structure, the load on a synchronization indicating signal source is relieved.

The present invention provides a long-distance coverage method and a base station. The long-distance coverage method in the present invention includes: determining, by a base station according to an initial radius, a round trip delay, where the initial radius is a cell radius of an initial coverage area of the base station; adjusting, by the base station according to the round trip delay, a downlink sending moment and an uplink receiving moment between the base station and long-distance user equipment UE; and communicating, by the base station, with the long-distance UE based on an adjusted downlink sending moment and an adjusted uplink receiving moment. In embodiments of the present invention, a downlink sending moment and / or an uplink receiving moment of a base station are or is adjusted, to eliminate a transmission delay caused by long-distance communication and to implement long-distance coverage of the base station without changing an existing network protocol.