Matches 1 - 49 out of 49
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7613759 Low-complexity nonlinear filters  
Processing an input signal that includes an input variable is disclosed. The input variable is compared to a set of ordered constants, the relative location of the input variable within a range of...
7596472 Device for synthesis of a composite digital signal with explicit control of the first three moments thereof  
The device determines the weighting coefficients to be applied to N digital source signals to form a composite signal. The first- to third-order moments of the composite signal must respectively...
7570833 Removal of poisson false color noise in low-light images usng time-domain mean and variance measurements  
Disclosed are an image processing method capable of effectively removing noise contained in an image photographed in a low light environment by using statistical information, and a system thereof....
7461112 Signal processor, signal processing method, signal processing program, recording medium with the signal processing program recorded therein and measuring instrument  
A digital signal value is divided to a plurality of zones along a route. A median is computed based on a difference between a digital signal value and a sum of squares of each component of a filter...
7444365 Non-linear digital rank filtering of input signal values  
Input values are non-linearly digitally filtered to produce as an output value the R th -largest value among the K input values, wherein the R th -largest value may be the median value with...
7403666 Apparatus and method of filtering digital information  
A filtering apparatus calculates a median of image data that includes nine pixel values arranged in a window of 3*3. First, an input circuit receives as an input the image data, divides the data...
7373367 Efficient digital filter design tool for approximating an FIR filter with a low-order linear-phase IIR filter  
A method and apparatus for designing low-order linear-phase IIR filters is disclosed. Given an FIR filter, the method utilizes a new Krylov subspace projection method, called the rational Arnoldi...
7260593 Device for determining the rank of a sample, an apparatus for determining the rank of a plurality of samples, and the ith rank ordered filter  
A rank-determining device determines the rank of a particular sample value from a set of digital sample values by utilizing two different thresholders that are implemented by comparators. The rank...
7151796 High performance equalizer with enhanced DFE having reduced complexity  
An apparatus and method for implementing an equalizer which (1) combines the benefits of a decision feedback equalizer (DFE) with a maximum-a-posterori (MAP) equalizer (or a maximum likelihood...
7079574 Carrier phase recovery system for adaptive burst modems and link hopping radio networks  
A method for a carrier phase recovery apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive bursts of radio signals on the plurality of...
7050647 Median filter  
A median filter using an M×N window sorts M×N pixel data along each column in descending order to generate N data strings, each having M sorted pixel data. The N data strings are sequentially...
6959167 Noise-level adaptive residual echo suppressor  
An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a...
6944352 Circuitry for determining median of image portions  
Hardware circuit for median calculation in an active pixel sensor.
6941332 Implantable medical device fast median filter  
A method for fast median filtering in an implantable medical device is disclosed that provides rapid filtering using computational mechanisms with following elements. A new sample value is received...
6901355 Method for correcting non-linearities of an output signal of an electrical component, particularly a measuring transducer  
A method for correcting non-linearities of an output signal of an electrical component with the aid of a characteristics map that is defined by discrete interpolation points. In this context, the...
6771835 Two-dimensional non-linear interpolation system based on edge information and two-dimensional mixing interpolation system using the same  
A 2-dimensional non-linear interpolation system and method based on edge information includes an edge detector, an edge direction modifier, a near-edge coefficient generator, a filter coefficient...
6754684 Method and apparatus for median filter on SIMD architecture digital data processor  
The invention provides improved methods and systems for rapidly performing a median filter calculation for a value at a predetermined position in a matrix of values representing a neighborhood...
6731820 Image filter circuit and image filtering method  
An image filter circuit which realizes a large-scale median filter as a digital circuit which has not been conventionally constructed without difficulty. The filter circuit has a histogram A update...
6687413 Signal processing apparatus  
A system to minimize the number of comparison and rearrangement operations and increase the processing speed with a small circuit scale utilizing a median filter in the form of hardware. A signal...
6628707 Adaptive equalizer system for short burst modems and link hopping radio networks  
A method for an adaptive equalization apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive variable-length bursts of radio signals on the...
6345075 Process and device for the increase of subscriber capacity in a cellular mobile radio network  
For each K subscriber of a cellular mobile radio network who is supplied with one and the same frequency and one and the same time slot a decision-feedback and therefore non-linear antenna...
6208764 Rank filter using a linked-list to link elements in a memory array in numerical order  
A rank filter suitable for use in real-time signal processing and image processing applications, for example, for improving an image. The rank filter can be implemented in software or hardware,...
6199084 Methods and apparatus for implementing weighted median filters  
Methods and apparatus for efficiently implementing weighted median filters are described. In a first hardware embodiment, the median filter is implemented using a number of storage locations which...
6175848 Variable accumulation correlators  
This invention provides apparatus and methods for obtaining information for aligning a reference signal with a received signal for global positioning satellite receivers which employs at least one...
6163324 Median calculation using SIMD operations  
A method of finding median values from different sets of values includes a step of forming a plurality of bit registers. Each bit register has bit groups corresponding respectively to the different...
6115727 Time-weighted trimmed-mean filtering apparatus and method  
An apparatus and method of filtering at least one set of data comprises determining a subset of Q data elements of a set of L data elements (12), and determining a filtered value based upon the...
6078213 Method and hardware apparatus for implementing an N-sample median filter  
A hardware apparatus for determining a median sample from n input samples is disclosed. The hardware apparatus includes n(n-1)/2 comparator circuits. The n(n-1)/2 comparator circuits compare each...
6058405 SIMD computation of rank based filters for M×N grids  
One way of filtering graphics images to remove pixel dropout and shot noise while preserving overall image quality is to use non-linear filters based on rank order of an M×N grid of pixel values...
6018750 Fast and efficient median search method and filter  
A fast and efficient median search method and filter searches a dynamically changing time-ordered list of data samples for a data sample representing the arithmetic median of the list. Embodiments...
5968111 Circular median filter  
A circular median filter outputs a median value among data expressed as angles as well as magnitudes. If external new data is input to the circular median filter, a plurality of median cells delete...
5862064 Median filter apparatus and method therefor  
A median filter can provide easier implementation and a simplified change of the degree. The median filter comprises an input end, a plurality of median cells for storing one data, wherein each of...
5838599 Method and apparatus for nonlinear exponential filtering of signals  
The present invention is directed to a method and apparatus for filtering a signal of a control and/or signal processing system in a manner which achieves both rapid tracking of signal transients...
5775293 Electronic throttle pedal nonlinear filter  
An electronic throttle pedal nonlinear filter. During throttle control of a vehicle's all speed governor, a nonlinear prefilter is used to modify the reference command. This prefilter can be used...
5608650 Systems and methods for testing pump flow rates  
The system and methods obtain a set of multiple data samples and derive an average of the data samples in the set (SET AVE ). The systems and methods derive a standard deviation for the data...
5490094 Method and apparatus for noise reduction  
A noisy input signal x is filtered with a restoration filter of median type to generate a filtered input signal y. The sum of the absolute differences between filtered and unfiltered signal is...
5377131 Digital amplitude estimator  
Amplitude information is derived from a periodic waveform by digitally sampling the periodic waveform, filtering a digital harmonic signal out of the digital sample sequence of the periodic...
5349546 Method and apparatus for non-linear signal processing with reduced upper harmonic components  
In a sampled data system with limited bandwidth where the output of a table memory 34 is multiplied with the sampled data in a multiplier 36 to produce a non-linear function, the process ordinarily...
5144568 Fast median filter  
A fast median filter is disclosed for filtering high frequency noise from signals, such as, signals from a radio altimeter. The filter continuously provides the median of a predetermined number of...
5138567 Median filter  
In a median filter, signals received at the input are fed to a cascade of delay elements whose number is equal to the degree N of the median filter. The signals at the outputs of the delay elements...
5097433 Stack filter with one stage per bit  
A hierarchical stack filter performs nonlinear filtering operations such as median filtering and other rank-order filtering. The stack filter has a number of stages in the stack which equals the...
4969203 Multiplicative sieve signal processing  
A masked monopolar sifting filter implemented by multiplying an input signal by a series of shifted nonuniform mask signals and selecting the minimum signal sample value from each resultant...
4928258 Recursive median filtering  
This technique involves digitally filtering data by determining the median of data values instead of mean or some other algebraic combination. It is unique in that the data used for the median...
4868773 Digital filtering by threshold decomposition  
A method and apparatus of digitally filtering an M-level signal decomposes the M-level signal into M-1 binary threshold signals by thresholding it at each value from 1 to M-1. The kth threshold...
4811264 Numerical precorrection technique  
A numerical precorrection technique for modifying a digital signal corresponding to a desired analog signal to compensate for the characteristics of an analog filter which processes the digital...
4672567 Median filter for reducing data error in distance measuring equipment  
A set containing an odd number N of successive raw range data samples from precision distance measuring equipment is established. The set is arranged in ascending order of sample magnitude. The...
4513440 Hardware median filter  
A hardware median filter, particularly useful for processing high resolutions imagery data is coupled to a set of line buffers to which pixel data for an image of interest is applied, to define a...
4231101 Digital filter arrangement for non-uniformly quantized PCM  
Digital filter for filtering non-uniformly quantised pulse code modulated signals formed by a sequence of code groups x(i), each comprising a polarity bit, a segment number and a mantissa number....
4231100 Arrangement for filtering compressed pulse-code-modulated signals  
Digital filter for filtering nonuniformly quantized pulse code-modulated signals formed by a sequence of code words each comprising a segment number s(i) and a mantissa number m(i). This digital...
3696235 DIGITAL FILTER USING WEIGHTING  
Digital filter apparatus in which a set of weighting signal samples to be multiplied in the filter has values which are exactly powers of two such that the filter multiplier network may be...
Matches 1 - 49 out of 49