49results about How to "Shorten data length" patented technology

In a remote control system, when a user directs a host device of a portable type toward target devices for search and specification, a search signal including a unique identifier (UID) is transmitted from a directional antenna. Each of the target devices stores the UID included in the received search signal in a memory unit, and transmits a response signal including device information on itself from an antenna. The host device identifies one of the target devices based on the device information included in the response signal, runs a control program for the identified target device, and displays an operation screen on a display unit. When the user instructs the remote operation on the operation screen, the host device transmits a remote control signal including the UID from the omni-directional antenna. When the target device receives the remote control signal including the UID that matches with the UID stored in the memory unit, the target device controls a function unit according to the remote control signal.

A visible light wireless communication receiver includes: a source code recognizing unit that receives a source bit stream and recognizes the source bit stream as source codes of a unit of a first number of bits; and a line coding unit that encodes each of the source codes into an encoding code of a unit of a second number of bits, the second number being larger than the first number. In particular, in the encoding code, the number of bits corresponding to 1 is the same as the number of bits corresponding to 0. Therefore, the change in brightness of lighting may be minimized in the visible light wireless communication.

A drive device capable of preventing a drop in the data transfer rate, even when write instructions from a host device are given with commands having a short write data length. If the write end address of one of a plurality of ATA commands issued by a host device 2 is consecutive with the write start address of the next ATA command, a command analysis unit 11 has data writing to an SD card 1 by the consecutive commands performed in a single process. As a result, overheads when writing data to SD cards are incurred only once, allowing the transfer rate to be improved.

A method and apparatus for improving the data readability in a disk drive is described. The disk drive uses an error recovery mode in which the rotational speed of the motor is decreased below the normal operating speed and a rereading is performed. The reduced speed lowers the energy generated in collisions with a foreign object and the data error length is shortened allowing data to be read which cannot be read at the normal operating speed.

The invention discloses a radio frequency identification two-way authentication method based on an ellipse curve and aims at mainly solving the problems of limited label storage resources, excessively-high calculation complexity and poor communication security of the existing RFID and a SQL interference module. The radio frequency identification two-way authentication method comprises the steps of (1), sending identity information to a label through a reader; (2), reading a session key kvz in per-stored data according to the identity of the reader through the label, encrypting relative authentication information by using the session key and sending an encryption result to the reader; (3), decrypting the relative authentication information by using a key value K through the reader and sending a random number and the session key to the label; (4), checking accuracy of the random number through the label after receiving information sent by the reader and sending an intermeddle value to the reader; and (5), finishing a final authentication process through the reader by using the intermeddle value. Through the method, the two-way authentication of the label and the reader is realized; calculation amount and occupied resources of the label are reduced; the communication safety is ensured; and the method is better applicable to an RFID (Radio Frequency Identification Device) system with limited resources.

The pulse generation circuit generates a first pulse signal and a complementary second pulse signal. The first and second pulse signals are activated simultaneously in a normal mode and activated selectively in response to a test input signal in a test mode. A multiplexing input circuit selects and outputs one of a data input signal and a test input signal as a latch input signal in response to the first pulse signal and the second pulse signal. The latch input signal corresponds to the data input signal in the normal mode and corresponds to the test input signal in the test mode. The latching circuit latches the latch input signal to generate data output signal. The length of data transfer path is reduced, and DtoQ delay can be decreased.

An information-processing method performed in an information-processing apparatus, the information-processing apparatus performing wireless communication with a first apparatus and wire communication with a second apparatus, the information-processing method including the steps of:

• • transmitting an interrupt signal to the second apparatus by using the wire communication when data is received from the first apparatus;
  • receiving, by using the wire communication, a clock signal from the second apparatus which receives the interrupt signal; and
  • transmitting and receiving, by using the wire communication, data between the information-processing apparatus and the second apparatus.

The embodiment of the invention relates to the technical field of communication, and discloses a packet loss rate calculation method, a server and a computer readable storage medium. In the invention,the packet loss rate calculation method is applied to a first agent end based on a forward error correction (FEC) protocol, and comprises the following steps: determining a maximum serial number, a minimum serial number and the number of received messages in FDP format messages received in a sampling period, wherein the message in the FDP format is sent by the second agent end and comprises a serial number field, and the serial number field comprises serial number information of the message; calculating a first packet loss rate according to the maximum serial number, the minimum serial number, the number of the messages and a preset constraint relationship among the maximum serial number, the minimum serial number, the number of the messages and the packet loss rate, wherein the first packet loss rate is the packet loss rate of the second agent end. In the embodiment of the invention, the packet loss rate can be calculated without sending the detection message, the calculation processof the packet loss rate is simplified, the detection message is prevented from occupying the bandwidth, and the flow consumption is reduced.

[Problems] When two communication nodes communicate with each other they more reliably confirm that the communication party is a correct one.

[Means for Solving Problems] Computation is performed on the basis of a first communication identifier created by a second communication node and contained in a first authentication message replied to the first communication node in response to a connection request message transmitted from the first to the second communication node, authenticator data held in the first communication node, and a second communication identifier created by the first communication node so as to create a message different from the other messages each time, creatable easily from the authenticator data, identifiable as a message created in response to the first authentication message, and not easy to derive or deduce authenticator data from this message. The second authentication message is checked.

In the field of data cards with a rotatable external port, a data card with a rotatable connector and a rotatable connector for a data card are provided. The data card with a rotatable connector includes a data card body and a rotatable connector, where the rotatable connector includes an external port for connecting with an external device, and the rotatable connector is rotatably connected with the data card body. The data card further includes an antenna set in the rotatable connector. The rotatable connector for a data card includes a rotatable connector body and an external port for connecting with an external device, and includes an antenna therein. Through setting the antenna in the rotatable connector, no matter what angle the data card is rotated, the antenna is always maintained in the same state, so that the antenna can be modulated in advance, so as to eliminate the interference on the performance of the antenna caused by the external device, and ensures stable performance of the antenna.

The invention discloses an adaptive data reduction method based on piecewise transient recognition, which comprises the following steps of: A, determining the number of segments and the length of eachsegment of reduced data according to the total data length and the reduced target length; b, establishing proportionality coefficients of a segmentation method and a transient method; c, according tothe proportionality coefficient, adopting a segmentation method for each segment of signals, and obtaining screened data and corresponding timestamps; d, according to the proportionality coefficient,adopting a transient method for each section of signal to obtain screened data and a corresponding timestamp, wherein the step D and C are not sequential; and E, integrating the data obtained by thesegmentation method and the transient method of each section of signal to obtain reduced data. According to the method, the trend information in the signal is extracted by adopting a segmentation method, the mutation information in the signal is extracted by adopting a transient method, and the data length is shortened on the basis that the information of the overall trend in the signal and the information of the key mutation signal are reserved by matching the two modes according to the proportionality coefficient.

The invention discloses a fractional order system identification method based on Legendre wavelet multi-resolution analysis. The method comprises the following steps that firstly, Legendre wavelet orders are selected in the interval of [0,1]; secondly, an operation matrix of Legendre wavelet integration is derived by utilizing a block pulse function integral matrix; the input signal and the outputsignal of the system are expanded in the form of Legendre wavelet; the wavelet multi-fraction analysis characteristic is utilized, output signals are continuously decomposed, high-frequency information is discarded, the data length is reduced, and finally, system parameters and orders are solved in a cyclic fractional order integral mode by adopting a least square method and taking an IAE index as a target function. According to the method, the problems that parameter estimation is slow and a noise pollution system cannot be identified due to single dimension, high order and multiple coefficients of a traditional Legendre wavelet integral operation matrix identification method are effectively solved, the system identification speed is increased, and the influence of noise on the identification precision is reduced.

A semiconductor memory device includes a memory cell array divided into a plurality of areas, a common data bus connected to an input/output circuit, a plurality of individual data buses connected to different areas of the memory cell array through different paths respectively, and a bidirectional buffer connected to the common data bus and the individual data buses. In the semiconductor memory device, the bidirectional buffers data transmitted bidirectionally between the common data bus and a selected one of the individual data buses.