131 results about "Filter factor" patented technology

Optimizers must work with numeric data from a variety of sources including column statistics, estimated filter factors, record counts estimated costs and the like. Embodiments provided herein define and represent any such numeric measurements as a Vector of N dimensions, where n is a number of aspects of measurements that a particular optimizer is configured to consider. A particular embodiment provides a 4-dimensional vector where the dimensions represent magnitude, confidence, variance interval, and penalty. Examples of measurements considered by the optimizer, and which may be represented as a vector, include cost, estimated selectivity of a predicate, estimated number of records returned from part or all of a query, estimated record fanout when joining one file to another, etc.

A In a noise suppression apparatus, an extractor extracts a noise component from an audio signal. A stationary noise estimator estimates stationary noise included in the noise component. A first noise suppressor removes a spectrum of the stationary noise from a spectrum of the audio signal to an extent determined by a subtraction factor. A non-stationary noise estimator estimates a spectrum of non-stationary noise by subtracting the spectrum of the stationary noise from the spectrum of the noise component. A factor setter generates a filtering factor for emphasizing a target sound component contained in the audio signal from the spectrum of the non-stationary noise. A second noise suppressor performs a filtering process using the filtering factor on the audio signal after processing of the first noise suppressor. An index calculator calculates a kurtosis change index representing an extent of change of kurtosis in a frequence distribution of magnitude of the audio signal between the kurtosis observed when processing of the first noise suppression part is performed and the kurtosis observed when processing of the second noise suppression part is performed. A factor adjuster variably controls the subtraction factor according to the kurtosis change index.

The invention provides a multiphase filter, a digital signal processing system and a filtering method. The digital signal processing system (100) of the invention comprises a multiphase interpolation filter (101) and an array memorizer (102), wherein the multiphase interpolation filter (101) comprises a filter factor self-adoption processing module (1001) and a filter factor matrix (1002). The multiphase filter, the digital signal processing system and the filtering method of the invention can decrease the filter power dissipation, simplify filter calculation complexity and decrease the system resource cost.

The present invention discloses HF compensating method for seismic signal with seismic microlog. The seismic waveform information is utilized in analyzing spectral characteristic of primary waveform in direct wave and finding out the attenuation features of seismic signal in different depths. Meanwhile, system input and output are used in analyzing absorbing attenuation response of near surface system and performing HF compensation of seismic data. The present invention applies seismic microlog technology in the research of attenuation law of near surface medium, and the waveform characteristic of serial seismic primary waves is used in searching the waveform spectrum variation in different depths, so that one reverse filter factor is found out for the HF compensation of superposed seismic data with artificial seism reflecting signal. The present invention has raised seismic signal distinguishing capacity.

The invention provides a method and a device for applying filtering factor assessment in optimization of an access path in a database. The method for applying the filtering factor assessment in the optimization of the access path in the database comprises extracting a relevance condition from statement sections used for database inquiry, wherein the relevance condition defines a relationship between a variable and a first table; obtaining first statistical information according to the relevance condition and statistical information of the first table; extracting a filtering condition from the statement sections, wherein the filtering condition defines a relationship between the variable and a second table; obtaining second statistical information according to the filtering condition and statistical information of the second table; and assessing a filtering factor of the filtering condition according to the first statistical information and the second statistical information. The device for applying the filtering factor assessment in the optimization of the access path in the database corresponds to the method for applying the filtering factor assessment in the optimization of the access path in the database. The method and the device for applying the filtering factor assessment in the optimization of the access path in the database are capable of accurately assessing the filtering factor of the filtering condition, and thus are beneficial for carrying out the further optimization of the access path.

The sub carrier wave selector (107) selects m sub carrier waves from n sub carrier waves of signal. The filter factor calculator (108) calculates the filter factor used to forecast the signal channel via the signals of m sub carrier waves; the filter factor average part (301) averages said m filter factors; and the signal channel forecast part (109) uses average filter factor to forecast the future signal channel frequency response of all sub carrier waves.

The invention discloses a system and method of sub strip impulse dip point noise reduction. It uses first access sampling signal and second access sampling signal which are outputted by two non-directing microphones separately minus second access sampling signal and first access sampling signal which have been time-delayed to obtain forward directing signal and rear directing signal; it then decomposes it into many fore-and-after sub strip signals; impulse filter does multiplication with the corresponding strip rear sub strip signal and impulse filter factor and outputs the adjust signal of rear sub strip; accumulator uses each strip's foreword sub strip signal minus rear sub strip adjust signal and outputs it; at last synthesis filter set accumulates the outputs of accumulator and outputs the signals. The dip spots of different strip can align several noise sources at the same time to assure controlling the noise of output signals.

A digital satellite broadcast receiver capable of an optimum signal reception even when an arbitrary outdoor unit is connected. Please noise characteristics of an outdoor unit connected to a digital satellite broadcast receiver when receiving a burst symbol is estimated based on a bit error rate of an 8PSK modulation signal determined by a trellis decoder (7) when a CNR measured by a CNR measurement circuit (5) is equal to a preset value, and, based on the estimated phase noise characteristics of the outdoor unit, a filter factor of a loop filter (9) inserted into a carrier regenerative loop is set.

In a base station apparatus, an upstream Doppler shift estimating part (104) estimates the Doppler shift amount of a received signal, an upstream filter factor deciding part (108) decides a filter factor from the Doppler shift amount, and a control signal producing part (109) produces and transmits a control signal indicative of the filter factor to a communication terminal apparatus. In the communication terminal apparatus, a control information extracting part (112) extracts the filter factor from the control signal, and an averaging part (113) averages, in a time period based on the filter factor, instantaneous power values determined by an instantaneous power measuring part (111) and calculates a noise power value. A radio quality informing part (114) transmits to the base station apparatus a signal indicative of a radio quality based on the averaged power value and noise power value. In the base station apparatus, a transmission method deciding part (105) decides, based on the radio quality, a modulation scheme and a coding rate. In this way, the reliability of the radio quality informed to the base station apparatus can be raised and the modulation scheme decided based on the radio quality can be optimized.

This invention relates to a method for applying an adaptive method to suppress image noises including utilizing the inter-field recursive method to find out edges of the image and present diameter and direction of the edges by computing the brightness correlation of being selected pixel points, utilizing the image blanking period information to estimate the noise grade of the local field image, selecting related filter factors to filter to get the noise reduction result. This invention can apply filter factors with different strength to different pollutant degrees of images to get a more natural image result.

The invention provides a compensation method for unbalanced broadband intermediate frequency signal amplitudes. Intermediate frequency signals are input into an FPGA, and amplitude values of all frequency points are generated through the FPGA. A PC reads amplitude values corresponding to N1 frequency points respectively from the FPGA, and an amplitude sequence A (i) is generated. The amplitude sequence A (i) with the length of N1 is expanded to be N2 long and is normalized to obtain an amplitude sequence B (i). The B (i) is multiplied by a standard amplitude-frequency response S (i) to obtain an amplitude sequence C (i). Windowing and IFFT are carried out on the amplitude sequence C (i) through the PC, the length is N2, and N3 data in the middle are selected as a filter factor sequence h (i). The filter factor sequence h (i) is loaded into a compensation filter in the FPGA through the PC. An output signal of the compensation filter in the FPGA is a sampling sequence after unbalance amplitude compensation.