121results about How to "Reduce speed requirements" patented technology

Pulse-echo imaging systems and methods are provided, including a transmit code sequencer and a pulse generation circuit, The transmit code sequencer is configured to input a transmit code sequence to the pulse generation circuit. A transducer is configured to receive electrical signals provided as pulses using coded excitation according to the transmit code sequence, and to transduce the electrical signals to pulses of energy other than electrical signals. The transducer is further configured to receive echoes of the pulses of energy other than electrical signals and convert the echoes to received electrical signals generate using coded excitation. A receive circuit is configured to receive the received electrical signals generate using coded excitation, perform analog sampling of the received electrical signals generate using coded excitation, and provide a weighted, summed digital signal by processing the analog samples. At least one example of a pulse imaging system described is configured for ultrasonic pulse-echoes. At least one example of a pulse imaging system described is a medical diagnostic imaging system.

The invention relates to the field of digital-analog hybrid integrated circuit design, aims to increase the conversion rate of a monoclinic ADC and provides the analog-digital converter which is simple in structure and low in power consumption. According to the adopted technical scheme of a low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and a converter, the converter is composed of a ramp generator, a counter, comparators, multiplexer switches and a register; the ramp generator generates a ramp voltage Vramp and k reference voltages VrefK, wherein K=1, 2, 3..., K; each of the k reference voltages VrefK is supplied to the corresponding comparator through one of the corresponding multiplexer switches; the ramp voltage Vramp is supplied to each comparator. The low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and the converter are mainly applied to digital-analog hybrid integrated circuit design.

In a particular embodiment, a digital circuit includes a frequency detection circuit operative to compare information related to transitions between sequential samples of a received signal. The frequency detection circuit is further operative to generate a control signal to reduce a sampling rate of the received signal in response to a predetermined number of the sequential samples having a same value. The digital circuit also includes a digital phase detector operative to provide the information related to the transitions between sequential samples to the frequency detection circuit.

A modulation method for optical communication comprises the step of generating an optical signal modulated between a plurality of different states of polarization and between different phase states. The plurality of states of polarization comprises first states of polarization (SOP1-4). The first states of polarization (SOP1-4) define a single great circle (10) on the Poincare sphere. The method is characterized in that the plurality of states of polarization further comprise one or more second states of polarization (SOP5-6) located outside the great circle (10). Such additional second statesof polarization increase the symbol alphabet.

The invention discloses a signal feedback loop and a method for predistorter, and power amplification equipment. The signal feedback loop comprises: a down converter for converting feedback signals downward into baseband signals or intermediate frequency signals, a first filer for filtering the baseband signals or the intermediate frequency signals to preliminarily inhibit main band signals among the signals, thereby outputting first filtering signals, an analog-to-digital converter for converting first filtering signals into digital signals from analog signals, a second filer for filtering digital signals to further inhibit the main band signals among the signals, thereby outputting second filtering signals, a power calculator for calculating the out-of-band power of the feedback signals according to the second filtering signals; and a coefficient updating controller for updating the coefficient of the predistorter according to the out-of-band power. With the technology scheme of the invention, the dynamic scope requirement of analog-to-digital conversion and the complexity of simulation circuits can be reduced by shifting part of the simulation loop complexity to digital field and utilizing two-level filtering structure.

The invention provides a multi-input large-area writing method, a multi-input large-area writing device and a multi-input large-area writing system. The method comprises the following steps that: a handwriting input detection device detects whether a light spot enters a plane monitoring area or not; when detecting that the light spot enters the plane monitoring area, the handwriting input detection device sends trigger information to a receiver; the receiver acquires the motion trace data sensed by a luminous device generating the light spot, wherein the motion trace data is sensed by a motion sensing unit in the luminous device; and a control host computer acquires or erases the handwriting information according to the motion trace data acquired by the receiver. The method, the device and the system can remarkably reduce the requirements on the precision and speed of an independently used CMOS sensor, lower the cost, improve the accuracy and speed of inputting and erasing the handwriting information and greatly improve the cost and performance while ensuring that multiple electronic light pens and electronic erasers are used at the same time.

The invention discloses a laser pulse switch apparatus and a control method therefor. According to the laser pulse switch apparatus and the control method therefor, a first switch and a second switch are arranged behind a pockels cell and a multipass amplifier set respectively to form a two-switch single-shot system, a single pulse trigger signal is generated by inputting a laser synchronous signal into a delayer, and the first switch is controlled to be on once only, so that single-shot emission of laser pulses is realized; the first switch realizes that one laser pulse is quickly selected for passing, and the second switch takes effect of blocking light; the aperture and speed of the switch are realized by two switches respectively, so that the requirements on the aperture of the first quick switch and the speed of the second large-aperture switch are reduced; any change is not performed on a pump light path, so that the heat effect, the beam quality and the like of pump laser pulses are not changed and it is ensured that the quality of the whole laser device is not changed; and when a shooting range does not need the laser pulses subsequently, it can be ensured that the energy of the high-energy laser pulses in the multipass amplifier set is not accumulated for causing the problems of the heat effect and the like.

The invention discloses a space vector pulse width modulation (PMW) controller of a tri-level circuit and a control method thereof. The controller comprises a searching module and a computation module, wherein, the searching module is used for searching the right triangle area in which the space vector corresponding to given value is located in a space vector plane figure according to the phase angle of the space vector corresponding to the given value, and takes switch vectors corresponding to each vertex of the right triangle area as constants to establish a composite vector mathematical model of the space vector of the given value and the work time of each switch; and the computation module is used for inputting acquired voltage and current input to the composite vector mathematical model, computing the work time of each switch in the circuit, and outputting the work time to an execution unit (EU). In the invention, the control algorithm of space vector PMW is simplified, and the programming cost and the hardware cost are reduced.

The invention relates to multimedia network and the application thereof, on the basis of making fine and concrete analysis on video service demands, applying a truly original thinking mode to improve the existing multimedia network structure comprising network method, network structure and the application thereof, and putting forward that video services in multimedia can be separately processed, by method of delivery, control and communication of video media, according to different video service demands: decomposing or integrating multimedia by municipal-area network (MAN) convergence center switcher, i.e. distributing voice fax, data and video media broadcast TV in access network to the MAN; contrarily, integrating separate media of the MAN and sending them to the access network. And it is simple to process and has high efficiency, and further improves switcher performance. And it solves the problem that large-flow video service development is limited by network structural technique, network equipment technique and equipment capacity bottleneck.

The invention relates to a method for comparison and reconstruction of a geographic redundancy database in a wireless communication network. The method comprises the steps that a comparison and arbitration controller module in a data center is in communication connection with at least two local proxy modules related to corresponding local databases and sends audit start orders, and whether the audit start orders are received for the first time or not is judged by each local proxy module; if yes, full detection is conducted; if not, increment detection is conducted; then, fingerprint features of each group are detected and identifiers with different fingerprint features in each local database are stored in a reconstruction list; corresponding user records in each local data are reconstructed through the comparison and arbitration controller module according to the reconstruction list until the fingerprint features of all the user records are identical. According to the method, the requirement for the bandwidth of audit is reduced, the size of data needing to be transmitted is greatly reduced only through detection of the fingerprint features, and therefore the audit speed is increased.

The invention provides a PLC safety real-time monitoring and measuring method and system. According to the technical scheme, under various operation conditions of the normal operation state of the PLC, values of various inputs and outputs and various soft element states in the PLC are recorded and encoded when key points are operated, and a code table is formed; in the operation stage, values of various inputs and outputs and values of various soft element states in the PLC are collected and encoded at various operation key points, corresponding state code words are obtained, then the state code words are rapidly searched in a code table, if the state code words cannot be found, a PLC emergency response mechanism is started, and the safety of a PLC application system is protected. According to the technical scheme, the safety of the PLC application system can be continuously and rapidly measured when the PLC operates, PLC execution code exception and input and output exception can be found in time, and compared with the prior art, the higher safety protection requirement of the PLC application system can be met.

The invention relates to an array three-dimensional coherent scanning laser radar device, which comprises a frequency modulation laser, a first beam splitter, an array transceiving telescope, an optical scanner, a delayer, a second beam splitter, a multi-channel optical bridge, an array detector and a signal acquisition and processor. Through one-dimensional array light beam emission and corresponding array coherent reception, detection target point position data can be effectively improved, an imaging view field is broadened, meanwhile, the scanning speed requirement is lowered, and the system has the advantages of simple structure, easy integration and miniaturization, and is particularly suitable for airborne three-dimensional coherent scanning laser radar information detection.

The invention provides a rocket recovery device and a liquid rocket. The rocket recovery device comprises a fixing seat, N supporting structures and M hanging frame structures, the supporting structures are evenly distributed in the circumferential direction and fixedly arranged on the fixing seat, the bottom ends of the supporting structures are fixedly connected with the fixing seat, the top endof each supporting structure is connected with one end of the corresponding hanging frame structure through a rotating structure, the other ends of the plurality of hanging frame structures extend towards the direction in which the hanging frame structures are close to each other, the hanging frame structures are used for moving downwards along with a rocket to be recovered through the rotating structures after making contact with the rocket to be recovered so as to buffer the acting force of the rocket to be recovered in the landing process and fix the rocket to be recovered, and rocket recovery is achieved. According to the rocket recovery device and the rocket, hanging lock mechanisms are connected with the hanging frame structures on the liquid rocket so as to capture the rocket to berecovered, the requirements for the posture and speed of rocket recovery can be lowered, and the success rate of rocket recovery is increased.

The invention provides a well cellar type tobacco transplanter, and relates to the technical field of tobacco transplanting appliances. The well cellar type tobacco transplanter comprises a vehicle body, a seedling throwing device is arranged on the vehicle body, a hole forming transplanting device is further arranged below the seedling throwing device, a seedling placing frame is further arranged above the seedling throwing device, and a linkage mechanism for driving the hole forming transplanting device and the seedling throwing device to act synchronously is further mounted on the vehicle body. The well cellar type tobacco transplanter solves the following problems that in the prior art, a device is provided with too many working assemblies, each mechanism is independently provided with a power assembly, the complexity of the device is increased, and the action synchronism of all the mechanisms cannot be guaranteed; a single person holds a well cellar maker to walk and make holes, and other personnel follow the well cellar maker to carry out operations such as seedling throwing and water replenishing, so that time and labor are consumed; and an existing tobacco seedling putting structure is tedious, a large number of tobacco seedlings cannot be put in sequence, and working efficiency is low.