1415 results about "Bidirectional transmission" patented technology

A two-way cable network offering high-speed broadband communications delivered via virtual private networks over a multi-channel shared media system. Bi-directional transmission of packet to ATM cell based communications is established between a head end communication controller and a number of subscriber terminal units, whereby individual cells are prioritized and routed according to a virtual connection. Virtual connections are organized to support multiple virtual private networks in a shared media CATV system. The virtual private network to which a particular STU belongs is user selectable and has the flexibility of handling multi up / downstream channels with different MAC domains. The present invention can also handle non-ATM MAC domains via the same common ATM switch. To overcome the limited number of addresses inherent to common ATM switches, a mapping / remapping function is implemented in the port cards. Furthermore, downstream as well as upstream traffic are filtered at each STU. In one embodiment, information pertaining to downstream traffic is used to implement predictive scheduling in order to improve the timing associated with the request / grant cycle. In another embodiment, a user has the ability to select a quality of service that best suits the needs of the current application. In a further embodiment, the scheduling function is associated with each of the receivers in order to provide improved scalability.

The invention discloses a remote automatic control system of a fracturing pump skid used in an oil field. The system is used for remote automatic control of a well service pump skid and a truck-mounted skid used in the oil field; the remote automatic control system consists of a field control system which consists of Siemens S7-315 series PLCs which are taken as a core, a Siemens MP370 which is taken as a remote control human-machine interface, and Ethernet which is taken as a transmission media; the system can achieve remote control functions such as start, stop and emergency stop of an engine, gear shifting, braking, turning back to a neutral position and idle speed of a gearbox and the like, and the system can modify field running parameters in a remote manner, thus realizing bidirectional transmission between the pump skid and the human-machine interface (HMI); the Ethernet is taken for communication so that the pump skid can transmit the field data to a remote controller or a server at the speed of 100MB / S; an industrial exchanger is taken to connect the devices such as the PLC, the HMI and the like to achieve more group controls; the exchanger can convert the field data into the data formats such as a standard *.CSV format and the like, and directly transmit the data to the server for data processing.

A hearing aid having a rechargeable battery and a charger for charging the battery include means for transferring data means for transferring data unidirectionally or bidirectionally between the hearing aid and the charger using either a magnetic field, light, or sound. The hearing aid includes means for detecting the charge state of a battery and for sending a signal to the charger indicative of the charge state. For acoustic coupling, the charger includes a microphone and a speaker and also includes a chamber for receiving at least a portion of the hearing aid.

A method for operating a tire pressure measuring system uses a transceiver. When triggered, the transceiver transmits an energy signal to a transponder in a tire that then responds with a data signal. So that the energy signals do not interfere with other transceivers on receipt of the data signals, the method makes provision for the repetition rate with which the energy signals are triggered to be a function of the speed of the vehicle. Transmission is more frequent at higher speed than at lower speed.

The invention provides a locomotive state information detection and diagnosis recording device, comprising a data collecting unit and a data processing unit; the data collecting unit is used for carry out real-time data communication with the on-board equipment of the locomotive and collecting the running data of the locomotive; the data processing unit is used for reading the data collected by the data collecting unit, obtains various events happened to the locomotive by carrying out classified logic judgment to the data according to different locomotive event types, writes all the events happened to the locomotive and corresponding parameters into a recording file and memorizes the file; meanwhile, the bidirectional transmission of the data between the locomotive and the ground can be realized by the wireless communication network. The invention also provides a locomotive state information detection and diagnosis recording method. The adoption of the device and the method of the invention realize the online diagnosis of the locomotive malfunction, record the running data of the locomotive objectively and practically, monitor the running state information of the locomotive in real time, and realize the bidirectional transmission of the data between the locomotive and the ground.

A removable communication card for mobile network devices, respectively a corresponding authentication method, which communication card includes a network interface module for bidirectional transmission of data with a network, an identification module for storing identification data for users, a measurement device for capturing biometric features of a user, and an analysis module with a processor unit for comparison with the stored identification data for the user.

Infrastructure for interactive broadcasting is provided using a wide area network for bi-directional transmission between a plurality of user nodes and a central source node, at least some of the user nodes comprising rooftop video broadcast receiving installations modified with a terrestrial bi-directional antenna and network transmission support electronics.

The invention relates to a signal processing method which optimizes the bit error rate under pragmatic conditions. The signalling method is optimally matched to the radio channel, variable with time, in rapid sequence by means of linear operations. Uplink and downlink transmission sides are determined by an excess of antennae on the downlink transmission side. The estimations of the channel matrix in the one transmission direction, necessary for the matching of the transmitter, can, in the absence of common-channel distortions with the condition of channel reciprocity, be directly obtained from the estimations for the other transmission direction. By a suitable linear combination of the transmission signals and, optionally, also the received signals, an error-free bi-directional transmission of data streams can be achieved in Rayleigh and Rice channels with significantly lower transmission powers than in purely receiver-side linear signal processing.

The invention discloses an outdoor blind guiding robot based on a global position system (GPS), general packet radio service (GPRS) and a radio frequency identification devices (RFID) and a navigational positioning method. The outdoor blind guiding robot comprises an outdoor blind guiding robot body and a remote service platform, wherein the outdoor blind guiding robot body comprises a vehicle body and a navigation handle, and the vehicle body is sequentially divided into four layers from bottom to top. The navigational positioning method includes that the GPS and an RFID module are adopted to position blind persons and broadcast position navigation information through voices; a GPRS module is adopted to achieve two-way transmission of data between the blind guiding robot and family members or the remote service platform, and the blind persons are monitored and are remotely guided to advance; when the blind persons have accidents, voice help calling can be performed by the GPRS module to the remote service platform; and the image recognition technology is adopted to recognize manual navigation road signs and friendly tracks on the roads so as to ensure accuracy and safety of routes. The outdoor blind guiding robot and the navigational positioning method solve the outdoor traveling problem of the blind persons.

A two-way transmission system of the present invention is arranged in such a manner that, when a host-side controller confirms the receipt of an IN packet from a USB host, the host-side controller transfers the IN packet to a function-side controller, and receives a DATA packet from the function side. The received DATA packet is temporarily stored in a FIFO. At the time of the receipt of the IN packet again, the host-side controller supplies, to the USB host, the DATA packet stored in the FIFO.

The invention discloses a device for safely isolating and exchanging industrial control networks and belongs to the technical field of security of the industrial control networks. A '2+1' structure system is adopted; the device comprises an external network processor, an internal network processor and an isolating and exchanging unit, wherein the isolating and exchanging unit is of a two-channel structure based on a bus and is connected with the external network processor and the internal network processor by virtue of an PCI bus. According to the device, the bus-based two-channel isolation control technology is used for opening and closing two channels in real time; bidirectional data transmission of the internal network and the external network is converted to two unidirectional data transmissions; the safe isolation of the internal network and the external network is ensured from hardware and software; many security problems in the bidirectional transmission of the same system in the conventional security technology are solved; meanwhile, the hardware cost and the complexity are reduced; the system reliability and the data exchange rate can be increased; the switching time is shortened.

A data storage device comprises a flash memory controller having an interface controller, a buffer, a buffer management device, and a microcontroller therein. The interface controller receives several pieces of data and transfers them to the buffer management device, which temporarily stores the data into the buffer and can read / write data temporarily stored in the buffer. The microcontroller is connected between the buffer and the buffer management device for controlling actions between them. There is also a flash memory storage device with a flash array and an error correction code (ECC) controller therein. The flash array is connected to the buffer management device, and is used to receive and store data. The ECC controller is used to check and correct errors in data. The reliability and speed of data access can thus be enhanced, and bidirectional transmission can also be accomplished.

The invention discloses a multi-hierarchy load balancing cloud resource monitoring method. The multi-hierarchy load balancing cloud resource monitoring method includes the steps that a distributed type multi-layer monitoring framework is set up; the resource states of all monitoring nodes are analyzed, and all resource monitoring scripts are automatically generated according to cloud platform user designated requirements; cluster center nodes integrate active and passive mainframe discovery strategies to continuously monitor local area networks which the cluster center nodes are responsible for; a monitoring center node adjusts monitoring strategies such as transmission protocols according to the load states of all the cluster center nodes, the transmission expenditure of monitoring data is reduced through a fast-compression and bidirectional-transmission technology, and the cluster center nodes are switched in time when the monitoring center node breaks down; the monitoring center node conducts mining and analyzing on historical monitoring data of all resources regularly and conducts warning and deep monitoring in advance. According to the multi-hierarchy load balancing cloud resource monitoring method, new cluster nodes are automatically found according to the features of the large-scale distributed type cloud environment, a load balancing technology is used, a powerful fault-tolerant mechanism and a powerful event engine are adopted, and therefore the high reliability and safety of the cloud environment are ensured.

A transmission control apparatus for improving PCT bi-directional transmission performance in an end node or gateway node of an asymmetric bandwidth pre-allocated subscriber network. The transmission control apparatus includes a TCP classification module for acquiring a TCP ACK packet to be transmitted over an uplink during bi-directional transmission; a band-width estimation / prediction module for estimating bandwidth of a downlink corresponding to the uplink at a time when the ACK packet is acquired, predicting following bandwidth of the downlink according to the estimated bandwidth, and calculating a optimal window size of the downlink such that the predicted bandwidth maintains residual bandwidth enough to allow transmission of an ACK packet over the downlink link compared with the maximum bandwidth allocated to the downlink; and a controller for inserting the calculated optimal window size as a reception window size included in the ACK packet and delivering the ACK packet to a destination node.

Simultaneous bidirectional transmission type LD / PD module having a substrate, a signal transmitting part mounted on the substrate, a signal receiving part formed on the substrate, an end of a fiber communicating with a base station, a light waveguide coupling the fiber to the transmitting part and the receiving part, a filter separating the receiving signal light from the transmitting signal light and a resin mold package containing the substrate, the transmitting part, the receiving part, the filter and the lead frame. The receiving part is electromagnetically shielded with multihole metal members from the noise generated by the transmitting part. The resin penetrates through the holes and fully covers the receiving part.

According to the present invention, in order to simultaneously realize high-speed transmission suppressing signal reflection and reduction of power consumption, a bidirectional transmission circuit, in which a plurality of sending / receiving elements send and receive signals via a transmission bus, is constructed so that, when a first sending / receiving element operates as a sending side, a first control unit sets a connection of the transmission bus to a first termination voltage source via a first terminating resistor by a first switch to off and a second control unit sets a connection of the transmission bus to a second termination voltage source via a second terminating resistor by a second switch to on.

The invention discloses an intelligent telemetering ammeter based on a wireless sensor network. The hardware of the intelligent ammeter equipment comprises an exclusive radio frequency unit, a microcontroller unit, a power supply management unit, an electrical power information collecting unit, an external storage unit, a liquid crystal display unit and a fault detection unit. The intelligent ammeter has the functions of information collection, calculation, forwarding, routing, and the like. The intelligent ammeter automatically forms an ammeter network with other intelligent ammeters by the radio frequency unit, and is connected with a computer system of a power supply enterprise by a gateway. When used, the invention is connected with a wireless public utility product based on ZigBee technology to be used as a base station of other ammeter networks. The invention realizes the reliable connection between a remote power supply enterprise and electrical power users based on the wireless network, realizes the bidirectional transmission of data, and meets the electricity management requirements of residents by power supply enterprises.

A method and an apparatus are provided for transmitting information between a monitor and a remote computer. The monitor comprises a sensor coupled to a memory for logging data output by the sensor over time. The information transmission method includes the steps of interfacing the monitor to a base station for transmitting the information between the monitor and the base station, and transmitting the information between the base station and the remote computer by means of a text message or pager message. In this way, information can be transmitted in both directions, either from the monitor to the remote computer or from the remote computer to the monitor.

The invention discloses a self-organization method of a sensor network and a mobile terminal system based on the same. According to the self-organization method of a sensor network, a sensor self-organization network can be formed by all nodes according to a multi-hop route protocol based on link prediction survival time, the node can be directly communicated with a node within a node communication range and communicated with a node not within the node communication range through transfer of other nodes in a multi-hop manner. The mobile terminal system comprises more than three terminals which form a sensor network by using the self-organization method of the sensor network. The system can obtain position, speed and motion direction information of other terminals through position acquisition; terminals with abnormal occurrence can inform the abnormal information of left terminals; and multi-hop voice and video two-direction transmission can be realized. The self-organization method ofthe sensor network and the mobile terminal system based on the same have the advantages of good performance, multiple functions and wide application prospect.

The invention relates to a controller of full-power alternative-direct converter used in wind generation, wherein the alternative-direct converter is formed by network converter and the convert of generator; the used generator is a permanent-magnetic generator; the rotor is in permanent-magnetic structure, without external magnetic activate power supply; two convert loops both uses the PWM converters operating in four quadrants, based on full-control element, which can improve the dynamic response, reduce cost and impact, realize bidirectional transmission of electricity, and realize generating via power factor sine wave current parallel network; and the invention uses improved direct torque technique to control the converter, to confirm the sine wave change of input current at the stator, with quick response, low vibration, torque dynamic control and wide speed adjust range.

The invention provides a WIFI (wireless fidelity) technology based underground intelligent mobile terminal system which comprises an aboveground application server, an aboveground database server, a PC (personal computer) control end, a switchboard, a router, underground wireless APs (access points), and a mobile terminal with a WIFI function, wherein the aboveground application server is used for implementing the connection and data transmission with the mobile terminal, and implementing the positioning services of the underground personnel and a production and safety information search service function; and the mobile terminal can establish a connection with the aboveground application server through the WIFI module so as to inquire underground production and safety information through accessing the application server, can regularly scan and send signal strengths of surrounding underground wireless APs to the aboveground application server, and can inquire the current position and call a roadway map so as to achieve an escape navigation function. The mobile terminal system disclosed by the invention integrates functions such as bidirectional communication, safety and production information acquisition and bidirectional transmission control, personnel target orientation, escape navigation, and the like, therefore, the mobile terminal system provides important guarantee for the production safety of underground operations.

This invention provides designs for communication systems that use adaptive filters in circuits whose purpose is to enable two-way transmission of information signals in the same frequency band at the same time over twisted pair channels, coaxial cable channels, fiber optic channels, or wireless channels. The methodology allows two-way DSL transmission over telephone lines, making use of existing DSL hardware and signal standards, so that the upload speed is increased by an approximate factor of ten. Applied to wireless systems with single antennas at the two ends of the channel, a doubling of the data rate is achieved for a given bandwidth. Applied to wireless systems with 2-way adaptive antenna arrays at a central location and a 2-way adaptive antenna array at each of a plurality of subscriber locations, the data rate for a given bandwidth is increased by a large factor.

A communication network includes a mobile radio equipment and a radio control system between which data encrypted at different security levels are transmitted bi-directionally. The mobile radio equipment includes: a security-level selection unit that selects one from among a plurality of security levels; and an encryption / decryption unit that encrypts / decrypts data to / from the radio control system using confidentiality parameters that are notified from the radio control system and correspond to the security level chosen by the security-level selection unit.

The invention belongs to a remote intelligent meter reading system field, is a remote intelligent meter reading system configured being used for remoter meter reading, bidirectional data transmission of an electrical meter, a water meter and an gas meter. Transmission of intelligent bidirectional data between a local end meter reading computer to a user terminal is realized by a new data transmission manner and via a common mobile communication network and low-voltage electric power carrier communication, so as to realize an object of remote controlling and user meter reading. Complementation can be performed between two communications of the common mobile communication network and the low-voltage electric power carrier communication, thereby realizing bidirectional transmission, conversion, transferring of different commnucation mode data. The remote intelligent meter reading system can directly read counting data of user's electric power meter, gas meter and water meter by the local end meter reading computer via a local area network composed of the common mobile communication network, an intelligent data collocting concentrator and the low-voltage electric power carrier communication, and peform remote control on the electric power meter, the gas meter and the water meter.

The invention discloses a two-node measuring equipment unrelated quantum key distribution system. Two independent laser devices and a measuring device Charlie are all placed on the same node, namely an Alice end or a Bob end to form the two-node bidirectional transmission quantum key distribution system. According to the system, a two-node structure is adopted, the Faraday conjugated rotation effect is utilized, and the same transmission path is designed; as a result, the problem that an existing three-node measuring equipment unrelated quantum key distribution system is poor in stability due to polarization change, phase drift, non-uniform phase reference systems, time jitter and other factors is effectively solved, the purposes of polarization self-compensation, phase drift self-compensation, calibration-free phase reference systems and easy synchronization are achieved, and an important basis is provided for practical application of the measuring equipment unrelated quantum key distribution system.

A two-way transmission system of the present invention is arranged in such a manner that, when a host-side controller confirms the receipt of an IN packet from a USB host, the host-side controller transfers the IN packet to a function-side controller, and receives a DATA packet from the function side. The received DATA packet is temporarily stored in a FIFO. At the time of the receipt of the IN packet again, the host-side controller supplies, to the USB host, the DATA packet stored in the FIFO.

A system for controlling the hydraulically actuated components, including snow-ice control components carried by a truck. The system employs a hermetically secure composite housing mounted externally of the truck cab on the truck frame which retains a unique hydraulic reservoir in combination with a manifold supporting a plurality of solenoid actuated hydraulic valves and an associated electronic drive circuitry including a slave controller having a bidirectional data transmission port. That port communicates through a single bidirectional transmission bus with a master controller retained within an operator interface control console mounted in the truck cab. That control console also will contain a slave interface controller, as well as a slave datalog and communications controller.

The invention discloses a single-fiber bidirectional transmission system based on mode division multiplexing. The single-fiber bidirectional transmission system based on the division multiplexing mainly comprises two optical signal input units, two optical signal output units and a mode division multiplexing and demultiplexing unit, wherein the mode division multiplexing and demultiplexing unit comprises two mode-type multiplexers which are connected through few-mode fiber. Polarization multiplexing optical signals are generated by the signal input units, the polarization multiplexing optical signals are enabled to be coupled into a mode field of the few-mode fiber by the mode-type multiplexer to finish the mode division multiplexing, the polarization multiplexing optical signals carried by the mode field are sent to the other mode-type multiplexer through the few-mode fiber, the received polarization multiplexing optical signals are enabled to be coupled into single-mode fiber by the other mode-type multiplexer and sent to the optical signal output units through the single-mode fiber, polarization diversity, mixing and balance detection are carried out on the received optical signals by the signal output units, then the received optical signals are changed into electric signals and then changed into digital signals. According to the single-fiber bidirectional transmission system based on the mode division multiplexing, the few-mode fiber is used for overcoming Rayleigh backward scattering effect, single-fiber bidirectional transmission is achieved, and use efficiency of optical fiber and wavelength resources is improved.