74results about How to "Short transmission delay" patented technology

The invention relates to a dynamic self-organizing hierarchical routing method. The method is applied to the tree topology structure of a wireless sensor network, the problems of path failure and data transmission incapability due to node mobility or failure are solved, and the topology structure of the network can be dynamically regulated. The network is established by adopting a multi-branch-tree-based topology structure, and each node maintains a routing table of one level, and records a sub-tree topology structure taking the node as a root. The routing table is effectively updated by inserting a sequence number during node access application, so that the problems of repeated node numbers in the routing table of upper-level nodes are solved. Only when data cannot be transmitted, the routing tables reorganize the topology structures, and timely maintain the topology structures in the network, so that energy overhead, computing overhead and data transmission real-time performance are combined, the reliable transmission of the data is ensured, the overhead is reduced, and the advantages of a routing protocol and a routed protocol are utilized.

The invention discloses an IGBT driving circuit embedded with an isolating source, comprising a power supply circuit and a driving circuit; wherein the power supply circuit sequentially comprises an oscillating circuit in charge of producing a push-pull driving signal, a transforming circuit which comprises at least one pair of switch tube and realizes energy transformation by alternate on/off according to the push-pull driving signal, a power transformer in charge of transmitting energy from the primary winding thereof to the secondary winding and a rectifying filtering circuit in charge of independent rectifying filtering on the secondary winding of the power transformer in two paths, wherein a common terminal is led out to realize positive and negative power supply output, so as to supply power to the driving circuit. A high-efficiency DC/DC isolating converter and the IGBT driving circuit are integrated, thus saving an outdoor isolating source and being convenient for application of a driver; and the invention is easy to be realized by adopting hybrid integrated thick film circuit, thus being beneficial to adopting SIP encapsulation and saving PCB area.

A switch driving circuit for driving a full-controlled power switch is disclosed, including a pulse-width modulation unit, a pulse transformer, an anti-interference module, a pulse-width demodulation unit and a driving-power amplifier. The pulse-width modulation unit converts a driving input signal into a positive-negative narrow pulse-width signal. The anti-interference module is coupled to the secondary side and the positive-negative narrow pulse-width signal includes multiple positive pulses and negative pulses. The anti-interference module filters out the ones from the positive pulses and negative pulses of which the pulse amplitude does not reach an effective threshold, and meanwhile the anti-interference module suppress a common-mode noise caused by a high voltage transient variation at a moment when the full-controlled power switch is turned on or off. The pulse-width demodulation unit converts the filtered positive-negative narrow pulse-width signal into a driving output signal.

The invention belongs to the technical field of distributed routing, and particularly relates to a data packet routing algorithm based on multi-agent deep reinforcement learning. In order to relieve the congestion condition in a computer network, an end-to-end adaptive routing algorithm is designed by using a multi-agent deep reinforcement learning technology, and each router completes data packetscheduling according to local information, so that the transmission delay of data packets is reduced. According to the method, firstly, a mathematical model of distributed routing is constructed, specific meanings of all elements in reinforcement learning are defined, then a neural network is trained, and finally algorithm performance testing is carried out in a simulation environment. Simulationexperiment results show that introduction of the deep neural network can mine feature information in an input network state, balance between an unblocked path and a shortest path is achieved, and compared with other common routing algorithms, shorter data packet transmission time delay is achieved.

A magnetic suspension counteraction flywheel motor control system adapts to control of three-phase permanent-magnet brushless DC motors for magnetic suspension counteraction flywheels, a new generation of high accuracy attitude control actuating mechanism for high-stability satellites. The invention mainly comprises a controller with a core of a Digital Signal Processor (DSP), a power amplifier, an upper bridge arm driving circuit in the power amplifier, a lower bridge arm driving circuit in the power amplifier, a resonance-type soft switch control circuit, a three-phase permanent-magnet brushless DC motor, a current detection circuit, a 28VDC steady power source, a +15VDC steady power source and a +5VDC steady power source. The invention can control On/Off of each power switch tubes on resonance-type soft switches through a non-demodulated isolation driving circuit, so as to fulfill high-reliability but low power-consumption running of control system driving circuits for magnetic suspension counteraction flywheel motors.

The invention discloses a mobile user computing task unloading method, and the method comprises the following steps: on the premise of meeting the computing resource constraint of an edge computing server, carrying out unloading scheduling on each task request and selecting a base station suitable for a user to ensure that the system delay and the terminal energy consumption of a user terminal forcompleting a task are minimum; and obtaining a base station selection, unloading decision and task scheduling scheme of the user. According to the method, the calculation complexity is greatly reduced, the user satisfaction is improved, and the purpose of optimizing the system time delay and the terminal energy consumption is achieved.

The invention discloses a data transmission method, user devices, a base station and a system, and belongs to the technical field of communication. The data transmission method includes the steps of enabling the user devices to obtain local-common-point-to-multipoint radio bearer parameters distributed by the base station, and enabling the user devices to send data to the base station according to the local-common-point-to-multipoint radio bearer parameters distributed by the base station so as to enable the base station to forward the data to the user devices in the covering area of the base station. The data transmission method further includes the steps of enabling the base station to distribute the local-common-point-to-multipoint radio bearer parameters to the user devices, enabling the base station to transmit the local-common-point-to-multipoint radio bearer parameters to the user devices, and when the data transmitted by the user devices are received, enabling the base station to issue the data to the user devices in the covering area of the base station according to a preset modulation coding manner. The data transmission method, the user devices, the base station and the system solve the problems of the informed delay uncertainty and the excessively large delay of a warning message in the prior LTE technology.

The invention discloses an emergent vehicle brake early warning system which comprises a CAN bus, a central processor, a data fusion module, a GPS positioning module and a special short-distance communication transmitting-receiving end. The state information of a former vehicle can be actively acquired, and furthermore, with the combination of the state information of a vehicle of a user, a brake early warning signal can be judged and reminding can be output, so that collision accidents happening in emergent braking of vehicles can be avoided, and an active protection function for safe driving can be achieved. By adopting the emergent vehicle brake early warning system, the limits that a conventional distance detection sensor is short in measurement distance, small in detection angle and great in obstruction influence of a barrier can be broken through, the position information of the former vehicle and the vehicle of the user is acquired by using the GPS positioning module, real-time communication between vehicles is achieved by virtue of a DSRC special short-distance communication technique, a brake early warning signal can be judged, and a brake early warning function can be achieved.

The invention belongs to the technical field of spatial network data communication, and particularly relates to a satellite network transmission control layer jam control method based on forward timedelay. Since a satellite network is characterized in asymmetric bandwidth, a ground-to-air reverse link is likely to be jammed. In order to solve the problem above, according to the satellite networktransmission control layer jam control method based on the forward time delay, when the reverse link is jammed, a sending window of a sending side is narrowed to reduce the jam, and meanwhile, the throughput rate of a forward ground-to-air link of the network is decreased. According to the satellite network transmission control layer jam control method, different control policies can be adopted according to different jam types of a communication link, and the utilization rate of the network bandwidth is increased.

The invention discloses a wireless high-definition video transmission module which comprises an emitting part and a receiving part, wherein the emitting part comprises a baseband processor, a WHDI (Wireless Home Digital Interface) video analyzer, a power amplifier, a control MCU (Microprogrammed Control Unit) and a PF (Pulse Frequency) antenna; the receiving module receives effective audio and video and control data from an air interface through five paths of antennae, the effective audio and video and the control data are sent to a radio frequency chip AMN (Artificial Mains Network) 3210 and then demodulated into five paths of digital IQ (Intelligence Quotient) signals, and the five paths of digital IQ signals are decoded by a baseband chip ANM (Answer Message) 2220. The wireless high-definition video transmission module is integrated into an audio and video device so that a user can easily utilize a WHDI technology to realize wireless transmission of high-definition signals, has the advantages of small transmission delay (less than 1ms), high video definition (supporting 1080P), no compression, long transmission distance (more than 30m), capability of penetrating through barriers, and the like.

The embodiment of the invention relates to the technical field of Internet, and discloses a private network architecture, a method for acquiring data of a back transfer server and an edge server. Theprivate network architecture comprises at least one type of transit server and at least one edge server, The transit server is connected with the edge server through a private network transmission link; The edge server is used for judging whether a transit server of a target type exists in the private network architecture or not; when it is judged that the transit server of the target type exists,target data are obtained from the transit server of the target type through a private network transmission link, and when it is judged that the transit server of the target type does not exist, the target data are obtained through a public network; And the cost required when the edge server obtains the data back to the transit server is saved.

The invention discloses a wireless high-definition low voltage differential signaling (LVDS) video transmission module, which is mainly used for televisions and realizes wireless high-definition audio and video signal transmission of the televisions. The module comprises an LVDS receiving module, a base band processing chip, a wireless home digital interface (WHDI) radio frequency processing chip, a power amplifier, a television decoding board, a micro control unit (MCU) and a power factor (PF) antenna. The wireless high-definition LVDS video transmission module is integrated in the television decoding plate so that the television can perform wireless transmission of high-definition signals, and has the advantages of low transmission delay time (shorter than one microsecond), high video resolution (supporting 1080P), compression absence, far transmission distance (more than 30 meters), obstacle penetrability and the like; meanwhile, the whole television becomes lighter and thinner.

Provided is a light receiving circuit, comprising four operational amplifiers, eight coupling resistors, an output triode, an auxiliary triode and a photodiode which are connected according to the scheme to respectively form a main line and an auxiliary line, wherein the main line is used for controlling the turn-on / turn-off of triodes; the auxiliary line is used for rapidly discharging the charge stored on the base electrode of the output triode. The invention provides a new light receiving circuit which has the performance of low transmission time delay; meanwhile, the light receiving circuit can reduce the delay difference between two voltage control signals through a second anti-phase amplifier, thereby optimizing output waveforms of the light receiving circuit.

The invention relates to the field of bus communication, and discloses a TTL-communication-bus slave-module expanded circuit. The TTL-communication-bus slave-module expanded circuit includes TTL buses, tristate buffers, a main module and multiple slave modules, wherein the main module includes transmitting base pins and receiving base pins and is usedfor transmitting request signals and receiving feedback signals, and the multiple slave modules include transmitting base pins and receiving base pins and are used for receiving request signals and transmitting feedback signals. The transmitting base pins of the main module and the receiving base pins of all the slave modules are connected to a first TTL bus, and the receiving base pins of the main module and the transmitting base pins of all the slave modules are connected to a second TTL bus; tristate buffers are arranged between the transmitting base pins of the main module and the first TTL bus, tristate buffers are arranged between the transmitting base pins of all the slave module and the second TTL bus, andthroughthe signal enhancement effect and output enabling function of the tristate buffers, the extension of the slave modules on the communication buses is achieved.

The invention discloses a switch tube drive circuit applied to a programmable DC power supply, the switch tube drive circuit comprises a transformer, a first drive branch and a second drive branch, wherein the first drive branch and the second drive branch are respectively connected with the high potential input end and the low potential input end on primary side of the transformer. Each of the first drive branch and the second drive branch comprises a drive amplification and bootstrap circuit, a blocking and coupling circuit, an acceleration delay circuit, a grid resistance switching circuit and a switching arm circuit. According to the invention, influenced problems including the mutual connection of the switch tubes, switch ringing and the like when the switch tube drives are solved, the circuit can be widely applied to power supply switching, especially in the instrument and equipment with higher requirements than the others, such as the programmable AC power supply, the programmable DC power supply and the like.

The invention relates to a high polymer double-fiber grating micro-detection system and a preparation method thereof. A polymer optical fiber formed by a flexible perfluoro polymer core layer with a high transmission speed and a radial gradient index and a cladding is used, and then a femtosecond laser is used for directly carrying out refractive index modulation on a plane in the axial directionof the optical fiber according to a certain distance, namely, the fiber bragg perfluoro polymer fiber grating is formed by writing or etching, then the grating is installed on a tiny flexible high polymer sleeve, and then the sleeve is fixed on a hard TPU base. Tiny changes of the external environment, like externally applied force and temperature, can change the screw pitch of the grating, so that reflected wavelength displacement changes are generated, and then data analysis is carried out by using photoelectric conversion, a data detection and analysis system and the like to obtain detection parameters.

The invention provides a method for processing the position of an encoder in a distributed system, a controller and a system, and relates to the technical field of automatic control. The method may comprise the steps that a processor of a first controller acquires retrieval time from a second controller, and sends the retrieval time to a first programmable unit array on an FPGA chip of the first controller, the first programmable unit array is enabled to retrieve a target encoder position corresponding to the retrieval time from a register set on the FPGA chip, and the target encoder positionis returned to the second controller through the processor of the first controller. According to the scheme, efficient positioning of the position of the encoder can be achieved, and the accuracy of the obtained position of the encoder is higher.

The invention provides a data transmission method and device, electronic equipment and a storage medium. The data transmission method comprises the following steps: decoding a first video stream uploaded by each terminal in N terminals by adopting M decoders, wherein M and N are positive integers, M is smaller than or equal to N, and N is larger than or equal to 2; encoding all the decoded video streams into a second video stream based on a first encoder in a set time period in the video conference process; and sending the second video stream to each of the N terminals. In the video conference process, all terminals are enabled to display the same picture in the set time period, so that coding computing resources can be saved, and the transmission delay time of the video conference can be reduced.

The embodiment of the invention provides a data recovery method, device and system. And the first server receives the metadata of the first data fragment sent by the second server, wherein the metadata of the first data fragment comprises first indication information which is an identifier or a storage position of a backup data fragment of the first data fragment in the first server. And when thefirst server confirms that the first server does not store the backup data fragment of the first data fragment in the first server according to the metadata of the first data fragment, the first server requests the second server for the backup data fragment of the first data fragment in the second server, and stores the backup data fragment of the first data fragment. The data size of the identification of the backup data fragment of the first server or the storage position of the backup data fragment of the first server stored in the metadata is smaller than the data size of the hash value. Therefore, few network resources are used for transmitting a large amount of metadata from the second server, and the data recovery efficiency is improved.

An apparatus for detecting lowering of at least first and second output voltages from a driving apparatus of a plasma display panel below corresponding regular voltages due to over current in the plasma display panel and generating an output control signal to be transmitted to the driving apparatus, includes a switching transistor having a collector to which a bias voltage is applied, an emitter which is grounded, and a base, the switching transistor being operated according to the level of a voltage applied to the base and generating the output control signal through the collector. A voltage signal generating portion is connected between the base of the switching transistor and a port of the first output voltage, and the base and a port of the second output voltage, respectively, for changing a bias voltage of the base as the first and second output voltages change. A switching support portion is connected between the emitter of the switching transistor and at least one of the first and second output ports, so that a lowered voltage is applied to the emitter when at least one of the first and second output voltages is lower than a corresponding regular voltage, to prevent incorrect operation of the switching transistor.