64 results about "Group frequency" patented technology

The present invention relates to a converter and a driving method thereof. The converter uses an input voltage to generate an output voltage by a main switch's switching and applies power to a load, senses the current flowing to the main switch to generate a sense voltage, uses a first voltage corresponding to the current applied to the load and a sawtooth waveform signal having a first frequency to control a group frequency of the burst mode, controls the main switch's turn-on timing, and uses the first voltage and the sense voltage to determine whether to turn off the main switch, thereby controlling the main switch's switching. The converter determines the start and end of the period for switching according to the result of comparing the first voltage and the sawtooth waveform signal. Therefore, a converter for having a constant group frequency, preventing audible noise, and preventing output voltage ripple, and a driving method thereof, are provided.

A wide-band voltage controlled oscillator includes a cross-connected transistors for providing a stable oscillating signal, an inductor unit for providing an inductance for determining a resonance frequency, a varactor bank including a plurality of switchable variable-capacitance elements parallely connected to the inductor unit and having a varactor capacitance varying with the first switching signal and a tuning voltage, a subsection capacitor bank including a plurality of switchable capacitor elements parallely connected to the inductor unit and having predetermined capacitances for grouping frequency sections, and a binary-weighted capacitor bank including a plurality of binary-weighted capacitor arrays parallely connected to the inductor unit and a bank selector for selecting one of the binary-weighted capacitor arrays, wherein each binary-weighted capacitor arrays includes a plurality of parallely connected switchable capacitor elements selectively switched on by a third switching signal to determine a variable weighted capacitance of the tunable binary-weighted capacitor bank.

A system and method for identifying an unknown word's likely definition based upon a common social networking group is presented. A user receives a message and selects an unknown word in the message. In turn, the recipient client identifies a common social networking group between the sending client and the recipient client. The recipient client then uses the common social networking group to identify the unknown word's definitions using one or more unknown word repositories, such as the sending client unknown word repository, the recipient client unknown word repository, or a mutual client unknown word repository, which corresponds to a mutual client included in the common social networking group. Once the recipient client identifies the unknown word's definitions, the recipient client orders and displays the definitions based upon the common social networking group and social networking group frequency values.

A method and mechanism for unified power supply and energy-saving operation of variable-frequency drive for escalator group adopts one AC/DC transducer in parallel connection with a braking unit to provide DC power source to multiple DC/AC variable-frequency speed regulators and motors in the group that control all elevators and escalators; therefore forming a channel for energy exchange among various drive units in the group to provide electric energy in the drive units in power-generating operation in the group to other drive units that are in the state of electrically-driven operation. The invention effectively solves the problems in prior art such as energy waste and liability for power grid to contamination. The operating method has a reasonable design and simple structure with safe operation. Compared to operating methods and devices of its kind, the operating method enables the electric energy fed back by the downward escalators to be utilized by the upward escalators, thus reducing the power supply of the electric network, achieving evident energy saving effects, and meanwhile ensuring stable operation of the electric network and reducing the manufacture cost of the device.

The invention provides a method and device for detecting single sample body cell mutation sites in abnormal tissue and a storage medium. The method includes the following steps that the effective sequencing sequence of an abnormal sample and the effective sequencing sequence of a simulated normal sample are obtained; in the effective sequencing sequences, basic groups, different from basic groups of the simulated normal sample, of the abnormal sample are obtained, according to the mutation basic group frequency, the types of the basic groups of the abnormal sample and the simulated normal sample are judged, the FISHER is then used for accurately detecting the difference of the types of the basic groups, and according to the difference, the mutation type is judged; by filtering the mutation types, false positive mutation and germ cell mutation are removed, and high-reliability somatic cell mutation sites are obtained. The method has the advantages of being high in sensitivity and specificity, has high sensitivity in mutation detection of known mutation genes, and new mutation genes can be found.

The invention belongs to the technical field of electronic countermeasures, and particularly relates to a radar signal sorting method based on combination of an SDIF and a PRI transformation method. With the adoption of the method, the search effect is faster and more obvious. The method comprises the following steps that radar signals are pre-grouped; an arrival time difference histogram is established for pre-sorted radar groups by using the SDIF; the radar signals are quickly searched and extracted according to the time domain characteristics of a radar signal model; a first-level difference histogram is established to quickly analyze staggering signals; whether complex type radar signal residues exist or not is judged; and the sorting result of each module is inquired. The beneficial effects of the method are that pre-sorting and main sorting are combined, the SDIF and the PRI transformation method are combined to act as main sorting, the SDIF part performs quick and effective sorting on the conventional signals, the staggering signals, the inter-pulse frequency agility and the pulse group frequency agility signals in the complex radar electromagnetic environment, the PRI transformation method part sorts the remaining jitter signals, and each part of the algorithms performs its own functions and is connected to form an effective and quick comprehensive sorting algorithm.

The invention discloses an adaptive balanced filter device in optical fiber communication. The device comprises a data grouping unit, a time-frequency transformation unit, a balanced filter unit, an inverse Fourier transformation unit and a data merging unit, wherein the data grouping unit is used for grouping the received time-domain signals according to sample point indexes to obtain grouped time-domain signals; the time-frequency transformation unit is used for transforming the grouped time-domain signals into grouped frequency-domain signals; the balanced filter unit is used for performing balanced filtration on the grouped frequency-domain signals according to a frequency-domain balanced filter coefficient; the inverse Fourier transformation unit is used for performing inverse Fourier transformation on the grouped frequency-domain signals after balanced filtration to obtain grouped time-domain signals after balanced filtration; and the data merging unit is used for merging the grouped time-domain signals after balanced filtration to obtain complete time-domain signals after balanced filtration. The invention further simultaneously discloses an adaptive balanced filter method in optical fiber communication.

An improved frequency stepping synthetic aperture radar (SAR) imaging method based on frequency domain frequency spectrum reconstruction specifically includes: 1 grouping frequency stepping SAR echo data stepping at carrier frequency n points to obtain n groups of sub-band echo data (including data of m distance lines) with different carrier frequencies; 2 judging whether aliasing can happen on distance frequency of the sub-band echo data performed with two-dimensional focus processing, and performing expanding operation on distance frequency spectrum of the sub-band echo data on yes judgment; 3 performing SAR imaging operation on the sub-band echo data, and removing an overlapped part of the frequency spectrum by windowing the distance frequency spectrum in the distance compression process when sub-band echo band width is larger than stepping frequency interval; 4 performing direction registering on n sub-images; and 5 performing distance frequency spectrum reconstruction on data of a kth distance line taken from each sub-image, repeating for m times and obtaining two-dimensional images with high range resolution. The method removes influence of sub-band data distance frequency spectrum aliasing and ensures distance frequency spectrum reconstruction to be performed smoothly.

The invention discloses a multi-signal-source frequency and DOA joint detection method and a multi-signal-source frequency and DOA joint detection device. The multi-signal-source frequency and DOA joint detection method comprises the steps of: conducting Mf-point DFT on L paths of signal samples, correcting frequencies and phases of DFT results by using a Tsui spectrum corrector to obtain a parameter group of corrected D groups of frequencies, phases and amplitude values, and constructing D direction vectors by using the parameter group; grouping and matching the D direction vectors accordingto the minimum distance to obtain D pieces of signal source parameter matching information; constructing a frequency remainder group according to the D pieces of signal source parameter matching information, and substituting the frequency remainder group into a closed type robust Chinese remainder theorem (CRT) model for reconstruction, so as to obtain a frequency estimated value; and acquiring L-1 phase differences according to the D pieces of signal source parameter matching information, constructing a phase reminder group, substituting the phase remainder group and a reconstructed module value group into the closed type robust CRT model for reconstruction to obtain an intermediate parameter, and calculating to obtain a DOA estimated value. The multi-signal-source frequency and DOA jointdetection method and the multi-signal-source frequency and DOA joint detection device realize the high-precision frequency and DOA joint estimation of multiple pairs of targets.

The invention provides a multiplex amplification system based on rapid mutation Y-STR gene loci, a method and application. The multiplex amplification system comprises 13 gene loci, namely, DYF387S1, DYF399S1, DYF403S1a/b, DYF404S1, DYS449, DYS518, DYS526b, DYS547, DYS570, DYS576, DYS612, DYS626 and DYS627, wherein sequences of amplification primer pairs are shown as SEQ ID NO.1-26, and the gene loci are marked through four fluorescein of 6-FAM, VIC, NED and PET respectively. According to the multiplex amplification system based on the rapid mutation Y-STR gene loci, the method and the application, for the 13 rapid mutation Y-STR gene loci, the primers are designed on the basis of group frequency survey, and the gene loci are integrated into the multiplex reaction system according to specific combination and primer concentration, so that amplification and detection of the gene loci are achieved simultaneously, and the amplification effect is better; when the multiplex amplification system is applied to the detection process, convenience and rapidness are better achieved, the typing result is clear, the correctness, sensitivity and stability of gene locus detection can be guaranteed, and higher individual recognition rate is achieved.

A frequency hopping sequence generator using a single binary sequence generator adopted for a multi-group frequency hopping frequency division multiple access (FH-FDMA) communication system, includes one binary sequence generator for generating consecutive binary sequences, and plural non-binary sequence converter for mapping a binary sequence into an independent non-binary sequence in each group by using a group ID.

The invention provides a method for recommending an object to a terminal user. The method comprises the steps of based on N objects, establishing an object correlation data set, wherein the object correlation data set comprises all objects in the N objects browsed by any terminal user within a first time period, and a correlation group consisting of two objects in the N objects successively browsed by any terminal user within the first time period according to a browsing sequence; determining the individual frequency of each object in the object correlation data set, occurring in the object correlation data set and the correlation group frequency of the object correlation group occurring in the object correlation data set, calculating the correlation degree of the two objects in the object correlation group based on the individual frequency of each object in the object correlation group and the correlation group frequency, and determining the object calibration recommendation degree for a terminal user in the objects based on the correlation degree and the determined seed object.

Method and system for adaptively estimating and compensating for phase noise error in a received signal s(t;data). A plurality of transmission parameter symbol (TPS) sets, each with a representative TPS group frequency, are incorporated in the signal before transmission. Received channel response amplitudes are analyzed to select a particular TPS frequency group, and inverse Fourier transforms, N(t) and D(t), are computed for these chosen signals. A complex ratio, r(t)=N(t)/D(t), is computed and used to determine a phase angle φ(t). A phase noise error compensated, time domain signal, equal to exp{−jφ(t)}·s(t−Δt(delay);data) is provided.

The invention discloses a multi-harmonic signal undersampling method based on multi-channel time delay. The method comprises the following steps: 1, performing initialization; 2, enabling a multi-harmonic signal x (t) to enter N' parallel sampling channels after being shunted, wherein the number of sampling points of each channel is N; 3, constructing an autocorrelation matrix Rxx by combining thesampling data of each sampling channel, and estimating a sampling signal parameter cm of each channel and a group of frequency parameters by using an ESPRIT method; 4, estimating the signal amplitudeam and another group of frequency parameters through the estimated parameter cm, sampling time delay tau of each channel and a ESPRIT method;; and 5, reconstructing 2K frequency parameters through the estimated two groups of minimum frequencies and a closed-form robust Chinese remainder theorem, and screening out correct K frequency parameters through sampling rate parameters. The method is usedfor solving the problems of frequency aliasing and mirror image frequency aliasing occurring in real number domain multi-harmonic signal undersampling.

Embodiments of the present invention relate to methods and systems for simultaneous communication with multiple wireless communication devices. In some embodiments, a method for simultaneous communication with multiple wireless communication devices includes receiving, using a plurality of antennas at a first wireless station, a plurality of packets, comprised of orthogonal frequency division multiplexing (OFDM) wireless signals, transmitted simultaneously from a plurality of other wireless stations wherein each of the simultaneously transmitted packets includes a plurality of frequency tones, frequency domain transform the received packets, grouping frequency domain transform outputs for each subcarrier, determining a difference between subcarrier groups formed over different sample sets, and determining a set of weights for each subcarrier, wherein the weights are selected such that the first wireless station can at least one of detect or demodulate the received plurality of packets.

Embodiments of the present invention relate to methods and systems for simultaneous communication with multiple wireless communication devices. In some embodiments, a method for simultaneous communication with multiple wireless communication devices includes receiving, using a plurality of antennas at a first wireless station, a plurality of packets, comprised of orthogonal frequency division multiplexing (OFDM) wireless signals, transmitted simultaneously from a plurality of other wireless stations wherein each of the simultaneously transmitted packets includes a plurality of frequency tones, frequency domain transform the received packets, grouping frequency domain transform outputs for each subcarrier, determining a difference between subcarrier groups formed over different sample sets, and determining a set of weights for each subcarrier, wherein the weights are selected such that the first wireless station can at least one of detect or demodulate the received plurality of packets.

The invention provides an RFID tag anti-collision method based on grouping frequency and tag estimation, which adopts a Vogt algorithm to estimate the number of tags to be identified, adopts tags withdifferent frequencies to participate in identification work, introduces multi-frequency tags into a dynamic frame time slot algorithm, establishes communication of the multi-frequency tags in corresponding frame time slots, and performs simulation. According to the invention, the number of to-be-identified tags is increased, the concepts of group identification and multi-frequency tags are increased; the characteristics of a traditional dynamic frame time slot Aloha algorithm and a grouping dynamic frame time slot Aloha algorithm are combined, optimization and improvement are carried out on the basis, compared with an existing mechanism, the system throughput is improved by 274%, the used time slot is reduced by 36%, and certain theoretical and engineering application value is achieved.