183 results about "Frequency function" patented technology

The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.

The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.

A data transceiver module for digital data communications in a portable handheld data terminal has multiple data spread spectrum modes which include direct sequence and frequency function modulation algorithms. The transceiver module has multiple user or program configurable data rates, modulation, channelization and process gain in order to maximize the performance of radio data transmissions and to maximize interference immunity. Various module housings, which may be PCMCIA type, are able to be mated with a suitably designed data terminal. Media access control protocols and interfaces of multiple nominal operational frequencies are utilized. Wireless access devices in a cell based network each consider a variety of factors when choosing one of a plurality of modes of wireless operation and associated operating parameters. Such selection defines a communication channel to support wireless data, message and communication exchanges. In further embodiments, the wireless access devices also support a second channel, a busy / control channel, for managing communication on the main communication channel and to overcome roaming and hidden terminal problems. Roaming terminal devices are also configured to support the dual channel design. Such configuration in both circumstances may involve the use of a multimode radio that is timeshared between the two channels or two radios, one dedicated to each channel.

A sensor and method are provided for transmitting sensor generated output signals in a pulse width modulated output signal. The sensor includes a pressure sensing element for sensing pressure and temperature sensing circuitry for sensing temperature. Output circuitry outputs a pulse width modulated signal containing an indication of the pressure and temperature. The pressure is transmitted as a function of duty cycle of the pulse width modulated output signal, and the temperature is transmitted as a function of frequency of the pulse width modulated output signal.

The time difference of arrival for a signal received at two or more receiving sites as transmitted from a wireless communications device, is determined by a frequency domain technique. The constituent frequencies of the signals received at the two or more receiving sites are determined, including the phase, or a value representative of the phase, of each frequency component. The phase values for the same frequency are subtracted to yield a phase difference values as a function of frequency. The slope of the function represents the time difference of arrival for the wireless communications device signal as received at the two receiving sites. To determine the mobile location based on the determined time difference of arrival values, a seed or initial location is first assumed for the wireless communications device and the distance difference of arrival (the time difference of arrival multiplied by the speed of light) is calculated. The calculated time difference of arrival is then used to adjust the distance difference of arrival by continuously iterating the position of the wireless communications device until the calculated distance of arrival and the calculated time difference of arrival (as multiplied by the speed of light) are within a predetermined margin.

A data transceiver module for digital data communications in a portable hand-held data terminal has multiple data spread spectrum modes which include direct sequence and frequency function modulation algorithms. The transceiver module has multiple user or program configurable data rates, modulation, channelization and process gain in order to maximize the performance of radio data transmissions and to maximize interference immunity. Various module housings, which may be PCMCIA type, are able to be mated with a suitably designed data terminal. Media access control protocols and interfaces of multiple nominal operational frequencies are utilized. Wireless access devices in a cell based network each consider a variety of factors when choosing one of a plurality of modes of wireless operation and associated operating parameters. Such selection defines a communication channel to support wireless data, message and communication exchanges. In further embodiments, the wireless access devices also support a second channel, a busy / control channel, for managing communication on the main communication channel and to overcome roaming and hidden terminal problems. Roaming terminal devices are also configured to support the dual channel design. Such configuration in both circumstances may involve the use of a multimode radio that is timeshared between the two channels or two radios, one dedicated to each channel.

There are many inventions described and illustrated herein. In one aspect, the present inventions relate to a temperature measurement system comprising (1) a first microelectromechanical resonator to generate a first output signal having a frequency that varies with operating temperature, wherein the first microelectromechanical resonator includes a frequency function of temperature; (2) a second microelectromechanical resonator to generate a second output signal having a frequency that varies with operating temperature, wherein the second microelectromechanical resonator includes a frequency function of temperature; and (3) frequency division circuitry, coupled to the first and second microelectromechanical resonators, to determine data which is representative of the operating temperature of the first and / or second microelectromechanical resonator using (i) data which is representative of the frequency of the first output signal and (ii) data which is representative of the frequency of the second output signal. The frequency division circuitry may include circuitry to divide the frequency of the first output signal by the frequency of the second output signal (whether in digital or analog domain).

The invention discloses a bridge detection method and detection system based on vehicle-bridge coupling vibration analysis. The bridge detection method comprises the following steps: obtaining time-variant model parameters and time-invariant model parameters of having or not having vehicle passing through a group of sensors which are arranged on a bridge in the length direction; computing mass-normalized mode coefficients at moments of a bridge structure; resolving an average value of zoom coefficients at all moments; obtaining a mass-normalized mode of the structure; reconstructing a frequency-function matrix of the structure; conducting displacement flexibility identification. According to the invention, the bridge detection method addresses the inconvenience of on-site detection and poor precision of current flexibility detection devices, overcomes the inability of environment vibration to identify deep parameters of the structure and the high difficulty of impact vibration on-site detection. The detection method not only can obtain static deformation of the structure, and can obtain rigidity information of the structure, thus providing effective evaluation of the safety of the bridge structure.

The invention relates to the field of air-conditioning operational control and specifically relates to an air-conditioning control method. The air-conditioning control method comprises the steps of S1, detecting the outer tube temperature T-outer tube of an outdoor unit, an outdoor environment temperature T-outdoor environment and the exhaust temperature T-exhaust of a compressor in real time and obtaining the real-time operational rotating speed of the outdoor unit according to the operational rotating speed function of the outdoor fan; S2, detecting an indoor environment temperature T-indoor in real time, and taking the indoor environment temperature T-indoor and the door environment temperature T-outdoor environment into a compressor operational frequency function to obtain the real-time operational frequency of the compressor; and S3, detecting an inner tube temperature T-inner tube of an indoor unit and n suction temperature T-suction of the compressor, and taking the inner tube temperature T-inner tube, the suction temperature T-suction of the compressor, the outdoor environment temperature T-outdoor environment and the exhaust temperature T-exhaust of the compressor into an expansion valve openness degree function to obtain the openness degree of the expansion valve. According the air-conditioning control method, the system response time of the whole unit is short, the air-conditioning unit can enter a steady operation stage rapidly, precise control can be achieved, and the number of early matching experiments is small.

The invention discloses an image ascending frequency system and a training method and an image ascending frequency method thereof. Feature images of an image is obtained by a convolution neural network module, and ascending frequency processing is carried out on the image by using a synthesizer to synthesize each n*n feature images in an input signal into a feature image, whose resolution is amplified for n times. In the ascending frequency process of the synthesizer, the information of the feature images in the input signal is recorded in the generated feature image without loss, so that a high-quality image whose resolution is amplified for n times can be obtained by the synthesizer. Moreover, in the image ascending frequency system, a plurality of synthesizers can be arranged to carry out gradual ascending frequency, and each synthesizer can execute a single time of ascending frequency function, so that the ascending frequency time of the system can be flexibly adjusted according to demand. Further, when the synthesizer amplifies the resolution of the feature image of n times, the number of the feature images output by the synthesizer is reduced, thereby reducing the signal input flow of the next synthesizer or the first convolution neural network module and simplifying the calculated amount thereof.

A method and system, the method including capturing country-specific parameters of a risk-exposed country relating to stored predefined criteria, assigning one or more disaster event types to a disaster history table, capturing and storing mapping parameters for a geographic risk map, assigning each of a plurality of selectable disaster financing types to a definable cost factor capturing the capital cost of the disaster financing type in relation to its application for disaster mitigation, determining expected catastrophe losses by a loss frequency function and the geographic risk map for various scenarios of occurring natural disaster event types, and preparing a forecast of an effect of the disaster financing type to cover the catastrophe losses based on the coverage structure, the assigned cost factors, and the determined expected catastrophe losses

A system and method for matching data using probabilistic modeling techniques is provided. The system includes a computer system and a data matching model / engine. The present invention precisely and automatically matches and identifies entities from approximately matching short string text (e.g., company names, product names, addresses, etc.) by pre-processing datasets using a near-exact matching model and a fingerprint matching model, and then applying a fuzzy text matching model. More specifically, the fuzzy text matching model applies an Inverse Document Frequency function to a simple data entry model and combines this with one or more unintentional error metrics / measures and / or intentional spelling variation metrics / measures through a probabilistic model. The system can be autonomous and robust, and allow for variations and errors in text, while appropriately penalizing the similarity score, thus allowing dataset linking through text columns.

Consistent with the present disclosure, a method and system for estimating chromatic dispersion of an optical signal in a coherent receiver is provided that is insensitive to polarization mode dispersion (PMD) and other polarization effects in the optical communication system. The effects of chromatic dispersion in the optical system are estimated by first calculating a phase shift between a pair of related frequency domain data outputs of a Fourier transform circuit. The calculated phase shift includes a linear phase component that is proportional to the chromatic dispersion, a DC constant phase component, and a data spectrum component. The calculated phase shift is then averaged over a number of clock cycles to remove the data spectrum components. The time averaged result is used to normalize any effects of PMD from the received signal. A slope of the linear phase component as a function of frequency is then calculated and used to estimate the value for chromatic dispersion. The chromatic dispersion estimate is then used to determine a number of coefficients of an inverse frequency response of the chromatic dispersion in the system, and is used to compensate for the chromatic dispersion.

Complex digital data values derived from a DSSS signal, in particular, a GNSS signal, are delivered to a general purpose microprocessor at a rate of 8 MHz and chip sums over eight consecutive data values spaced by a sampling length (TS), each beginning with one of the data values as an initial value, formed and stored. For code removal, each of a series of chip sums covering a correlation interval of 1 ms and each essentially coinciding with a chip interval of fixed chip length (TC), where a value of a basic function (bm) reflecting a PRN basic sequence of a satellite assumes a correlation value (Bm), is multiplied by the latter and the products added up over a partial correlation interval to form a partial correlation sum. The partial correlation interval is chosen in such a way that it essentially coincides with a corresponding Doppler interval having a Doppler length (TD) where a frequency function used for tentative Doppler shift compensation and represented by a step function (sine, cosine) is constant. The partial correlation sums are then each multiplied by the value assumed by the frequency function in the corresponding Doppler interval and the products added up to form a correlation sum.

A method for generating a frequency warping function comprising preparing the training speech of a source and a target speaker; performing frame alignment on the training speech of the speakers; selecting aligned frames from the frame-aligned training speech of the speakers; extracting corresponding sets of formant parameters from the selected aligned frames; and generating a frequency warping function based on the corresponding sets of formant parameters. The step of selecting aligned frames preferably selects a pair of aligned frames in the middle of the same or similar frame-aligned phonemes with the same or similar contexts in the speech of the source speaker and target speaker. The step of generating a frequency warping function preferably uses the various pairs of corresponding formant parameters in the corresponding sets of formant parameters as key positions in a piecewise linear frequency warping function to generate the frequency warping function.

The invention discloses a synthetic aperture radar (SAR) imaging method based on field programmable gate array (FPGA). The SAR imaging method based on the FPGA mainly solves the problems that an existing system is complex in structure and slow in data processing speed. The SAR imaging method based on the FPGA comprises the following steps: calling a multiplying unit in the FPGA, conducting fast Fourier transform (FFT) operation after multiplying each array of distance direction data and hamming window data after quantification, finishing distance pulse pressure; calculating a scene central location of the distance direction by inertia parameters, intercepting the distance direction data; transposing acquired data by interception, realizing to store aperture data based on direction; estimating a Doppler central value and a Doppler frequency modulation rate based on inertia navigation parameters; constructing a Doppler frequency shift function, a Doppler frequency modulation function and a direction hamming window function based on the estimated Doppler central value and the Doppler frequency modulation rate; conducting FFT operation by multiplying each array of the direction data after finishing the distance impulse pressure with the Doppler frequency shift function, the Doppler frequency modulation function and the direction hamming window function, and acquiring final imaging data. The SAR imaging method based on the FPGA has the advantages of simplifying an SAR imaging system structure, improving processing speed, and capable of being used in the SAR imaging under a missile-borne module.

The invention relates to a method for measuring frequency response function of a vibration structure in loud-noise environment, comprising the following steps: a linear swept-frequency signal is adopted as an excitation signal and acceleration response signals of the structure vibration is filtered in a fractional order Fourier domain by fractional order Fourier transformation, so that effect of noise in non-stationary process can be lessened, and measuring accuracy of the frequency response function is improved. Simultaneously, in the method, two groups of experiment signal data are expressed as one group of plural experiment signal data so as to avoid effect of superposition of two signal components, and only one-time filtering is needed to finish noise removal treatment of the two groups of the experiment signal data so as to improve noise removal effect and operating speed.

The invention provides a method and a device for determining optional ranges of the virtual inertia and damping coefficient of a VSG (Virtual Synchronous Generator), and relates to the technical fieldof VSGs. The method comprises the following steps: acquiring relevant parameters of a VSG grid-connected system built from a VSG to an infinite grid; establishing a state equation of the VSG grid-connected system; determining a small signal equation of the VSG grid-connected system; determining a small signal space equation of the VSG grid-connected system; determining a transfer function of theVSG grid-connected system; determining a natural oscillation frequency function and a damping ratio function of the VSG grid-connected system; and determining the optional ranges of the virtual inertia and damping coefficient of the VSG according to the natural oscillation frequency function, the damping ratio function and a preset restraining condition which is relevant to the natural oscillationfrequency function and the damping ratio function. Through adoption of the method and the device, the optional ranges of the virtual inertia and damping coefficient of the VSG can be determined accurately, so that the running of the VSG is safer and more stable.

The invention discloses a method for controlling the minimum running frequency of a variable frequency air conditioner. The method is characterized by comprising the following steps: (1) the outdoor environment temperature or the compressor exhaust pressure is detected periodically; (2) according to the outdoor environment temperature-minimum frequency function or the compressor exhaust pressure-frequency function, the minimum running frequency of a compressor under the outdoor environment temperature or the compressor exhaust pressure at present is calculated; and (3) the minimum running frequency of the compressor is updated according to calculation results in the step (2). According to the method for controlling the minimum running frequency of the variable frequency air conditioner, the outdoor environment temperature or the compressor exhaust pressure is detected periodically, the minimum running frequency capable of being borne by the compressor at present is calculated, the minimum running frequency of the compressor is updated, and it is guaranteed that when the air conditioner runs at a low frequency, the problems that losses of the compressor will be caused when loads are too large, and the service life is shortened are solved.

The instantaneous peak positive and negative frequencies of a Doppler spectral image are determined using the spectral column signal mask derived from the instantaneous peak frequency function of the ultrasound system. Using the determined peak frequencies, the audio wraparound frequency is adjusted so as to substantially avoid aliasing effects.

The invention provides a control method and apparatus for a PFC (power factor correction) converter, and a frequency conversion electric appliance. The control method comprises the steps of controlling the PFC converter to generate a frequency deviation function, wherein the frequency deviation value is periodically changed along with time; overlaying the frequency deviation function to the carrier wave reference frequency of the PFC converter to obtain a periodically-changed PFC carrier wave frequency function; detecting the phase of a mains supply voltage signal; and controlling the PFC carrier wave frequency corresponding to each frequency point of the PFC carrier wave frequency function to be periodically changed along with the phase of the mains supply voltage signal. Therefore, the maximum interference power spectrum amplitude detected in the test process is effectively lowered, the purpose of lowering the electromagnetic interference level in the high-frequency PFC technology is achieved, and the power consumption of the PFC converter is lowered.

An apparatus for use in a system that includes a network analyzer for determining a property, such as dielectric permittivity of a sample material as a function of frequency, the apparatus including: a cylindrical chamber for receiving the sample; a coaxial connector having a first relatively small diameter end coupleable with the analyzer and a second relatively large diameter end communicating with a side of the cylindrical chamber, the connector having inner and outer coaxial conductors; the inner conductor of the connector having a diameter that tapers outwardly from the first end to the second end, and the outer conductor of the connector having an inner surface whose diameter tapers outwardly from the first end to the second end. The chamber can accommodate relatively large samples, such as standard earth formation coring samples.

Measurement arrangement and method for active load pull measurements of a device under test (1). A wideband analog-to-digital conversion block (3) is provided for obtaining measurement data. First and second injection signal generators (7, 8) are connected to a source side and a load side of the device under test (1). This set up allows to create predetermined reflection coefficients at reference planes of the device under test (1). Injection signal parameters as determined are converted into the injection signals at the source and load side by digital-to-analog conversion. The wideband analog-to-digital conversion block (3) is further arranged for analog-to-digital conversion of the intermediate frequency signals to obtain the actual measured reflection coefficient versus frequency functions with a first frequency resolution. The first frequency resolution applied in the analog-to-digital conversion is equal to or better than a second frequency resolution applied in the digital-to-analog conversion.

The invention discloses a periodically poled LNOI ridge-type waveguide. The overall structure of the periodically poled LNOI ridge-type waveguide comprises a silicon or lithium niobate substrate (5), a silicon dioxide buffer layer (4), a gold electrode layer (3), a semiconductor organic polymer layer (2) and a periodically poled lithium niobate ridge-type waveguide (6) from bottom to top from a substrate. Compared with the prior art, the periodically poled LNOI ridge-type waveguide has the advantages that the production difficulty is greatly reduced, and the rate of finished products is improved; the transmission loss of the waveguide is remarkably reduced; the integration of a multi-function optoelectronic device can be easier to achieve; the device can obtain a more nonlinear effect; sum frequency and difference frequency functions of the PP-LNOI waveguide are achieved; a foundation is laid for the further design and production of practical frequency conversion devices, practical development of LNOI platform based integrated optical circuits and devices is promoted, and a support is provided for research and development of the next generation of optoelectronic hybrid integrated chips.

The invention relates to an impedance matching method of a pulse RF power supply and a matching method of plasma equipment. The impedance matching method of the pulse RF power supply comprises a step of (S1) setting an impedance adjusting element at a preset value and setting the pulse frequency of the pulse RF power supply as a preset pulse frequency, (S2) judging whether the preset pulse frequency is larger than a pulse threshold frequency or not, and going to (S3) if so, (S3) allowing the pulse frequency of the RF power supply to be equal to the pulse threshold frequency, starting the pulse RF power supply, realizing sweep frequency matching under an automatic RF sweep frequency function, and switching the pulse frequency of the pulse RF power supply as a preset pulse frequency after matching, (S4) starting the pulse RF power supply, and realizing sweep frequency matching under the automatic RF sweep frequency function. According to the impedance matching method of the pulse RF power supply, the difficulty of realizing impedance matching by the RF power supply can be reduced, thus the matching precision and matching stability of the pulse RF power supply can be improved, and thus the stability of the process is improved.

This invention pertains to the extraction of the slowness dispersion characteristics of acoustic waves received by an array of two or more sensors by the application of a continuous wavelet transform on the received array waveforms (data). This produces a time-frequency map of the data for each sensor that facilitates the separation of the propagating components thereon. Two different methods are described to achieve the dispersion extraction by exploiting the time frequency localization of the propagating mode and the continuity of the dispersion curve as a function of frequency. The first method uses some features on the modulus map such as the peak to determine the time locus of the energy of each mode as a function of frequency. The second method uses a new modified Radon transform applied to the coefficients of the time frequency representation of the waveform traces received by the aforementioned sensors. Both methods are appropriate for automated extraction of the dispersion estimates from the data without the need for expert user input or supervision.

The invention relates to a method for identifying the flow pattern of the two-phase, which combines the nerval net pattern identifying technology with the traditional time series frequency function statistical method and identifies on line, real time and automatically. The method comprise the following steps: a)processing the flow parameter time series of different flow pattern and getting the characteristic parameters of the frequency function of different flow pattern, b) setting the characteristic parameters as input samples, c) mapping from the measuring space to the flow pattern space by the nerval net identifying technology and identifying the flow pattern.

The invention discloses a windowing short-time Fourier transform three-point interpolation dynamic frequency measurement method, and the method comprises the following main steps: 1, carrying out the discrete sampling of a time domain continuous wave of a power grid, and obtaining an N-point sampling sequence U(n); 2, selecting a window function, employing the short-time Fourier transform, and obtaining a short-time Fourier transform matrix FSTFT(i, j) of the sampling sequence; 3, solving a spectral line k1 corresponding to the maximum value of a p-th column of the matrix, and the adjacent spectral lines k2 and k3; 4, employing a polynomial approximation method to solve a peak spectral line parameter alpha through the spectral lines k1, k2 and k3; 5, employing a formula f<mp>=( alpha+k1)*delta f, and solving the peak frequency f<mp> of the signal; 6, calculating a signal frequency change rate f<c-p>, determining columns which need to be added and calculated, and calculating a corresponding peak frequency f<mp>; 7, obtaining a dynamic frequency function f<m>(p) of the change of signal with time according to the peak frequency f<mp>. The method takes the windowing short-time Fourier transform as the basis, employs an interpolation method, also can carry out the analysis of the time domain of the signal while quickly measuring the frequency, is high in precision, and is simple in calculation.

A frequency-warped processing system using either sample-by-sample or block processing is provided. Such a system can be used, for example, in a hearing aid to increase the dynamic-range contrast in the speech spectrum, thus improving ease of listening and possibly speech intelligibility. The processing system is comprised of a cascade of all-pass filters that provide the frequency warping. The power spectrum is computed from the warped sequence and then compression gains are computed from the warped power spectrum for the auditory analysis bands. Spectral enhancement gains are also computed in the warped sequence allowing a net compression-plus-enhancement gain function to be produced. The gain versus frequency function is a set of pure real numbers, so the inverse frequency domain transform gives a set of time-domain filter coefficients. The speech segment is convolved with the enhancement filter in the warped time-domain to give the processed output signal. Processing artifacts are reduced since the frequency-warped system has no temporal aliasing.