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5951626 Adaptive filter  
An adaptive filter and method that proportionately adjusts individual tap gain distributors such that the individually adjusted tap gains are not necessarily equal to one another and that the...
5946351 Tap selectable decision feedback equalizer  
A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less...
5943367 Transmission system using time dependent filter banks  
In source coding, use can be made of switching filter banks in order to adapt the filter bank to the properties of the signal to be coded. If it is not allowed that the switching introduces...
5931892 Enhanced adaptive filtering technique  
A signal represented as a matrix of input values is adaptively filtered using a processor with a multimedia extension unit. A plurality of coefficients are loaded into a first vector register and...
5926405 Multidimensional adaptive system  
A multi-dimensional adaptive method and system which can be forced to converge to any predetermined solution of interest. Disturbances are input to the system along with reference signals. Error...
5912828 Equalizer filter configuration for processing real-valued and complex-valued signal samples  
An apparatus and method of implementing an equalizer filter configuration including a plurality of memory blocks and a plurality of filter blocks. The respective pluralities of memory blocks and...
5910993 Apparatus and method for actively reducing vibration and/or noise  
In apparatus and method for actively reducing a periodic vibration and/or noise, a divergence determinator is provided in which a presence or absence of a higher order divergence of a control of...
5910909 Non-linear digital filters for interlaced video signals and method thereof  
A structure and a format for providing a video signal encoder under the MPEG standard are provided. In one embodiment, the video signal interface is provided with a decimator for providing input...
5909384 System for dynamically adapting the length of a filter  
A novel system by which the utilization of a central processing unit (CPU) in performing filtering operations can be reduced by shortening the filter's length thus degrading the performance of the...
5900006 Median filtering method and apparatus using a plurality of processing elements  
An apparatus for median filtering a sequence of input values comprises (N+1) number of processing elements coupled in series for storing (N+1) number of input values included in a values group and...
5901075 Performance of an adaptive weight FIR filter having a timeshared tap weight processor  
An apparatus and a scheme for adapting a plurality of tap weights in an FIR filter wherein tap weights are adapted for a current data cycle utilizing a current subset of data and the tap weights...
5901175 Dynamically adaptive equalizer system and method  
An adaptive filter or equalizer for digital data communication includes, a first cascade circuit connected to operate as a digital finite-impulse-response (FIR) filter, the first cascade circuit...
5894429 Method for creating a digital control signal  
A method and system for converting an input signal into a dynamically-controlled digital output signal. A sensitivity and a threshold level of a digital input signal is adjusted. An absolute value...
5894495 Adaptive digital filter  
This invention relates to adaptive digital filters for echo cancellation in a bi-directional data transmission channel. Substantial hardware savings for a digital adaptive filter are possible, if...
5889869 Invisible acoustic screen for open-plan offices and the like  
The invisible acoustic screen for reducing sound leakage from handsfree telephones, loudspeaking computer terminals, and the like in a workspace includes a sound reducing apparatus comprising: a...
5870433 Method of processing signals in a viterbi decoder according to delayed decision feedback sequence estimation (DDFSE) algorithm  
A method of digital telecommunication via an electrical cable is provided, whereby the symbols of a data stream to be transmitted are supplied as a transmission signal to a transmission path,...
5862516 Method of non-harmonic analysis and synthesis of wave data  
A novel method of non-harmonic analysis of a physical waveform is disclosed. A digitized wave data is multiplied by a first sine and a first cosine function having a first predetermined period,...
5854814 Digital transmission system with improved decoder in the receiver  
A digital transmission system, such as a mobile radio system, having a transmitter for transmitting codewords which are derived from a digital signal, and a receiver for receiving codewords, the...
5841856 Hands-free telephone set  
A hands-free telephone set which is connected to both an analog cellular scheme line and a digital cellular scheme line includes first and second FIR filters. The first FIR filter is connected to...
5842158 Method for adaptive filtering of well logging data  
The invention described herein provides for an intelligent or "adaptable" filtering method that could be applied when filtering log data. In the present invention, for a given filter model, the...
5831880 Method for processing a signal in a CSD filter and a circuit therefor  
A method for processing a signal in a CSD filter includes the steps of obtaining real coefficients optimized to desired filter characteristics, calculating scaling factors for each real...
5828589 Self-adaptive trans-hybrid balance filter  
An adaptive balance filter includes a transmission path, a reception path, and an adaptive filter having a signal output, a coefficient output for outputting filter coefficients, an error signal...
5812608 Method and circuit arrangement for processing received signal  
The invention is related to a method and circuit arrangement for processing a received signal in a variable symbol rate system, such as a digital television system. In the method and arrangement...
5805480 Rotationally predictive adaptive filter  
A method for efficiently updating the coefficients of an adaptive equalizer in the situation of a propagation environment having a dynamically varying multipath. The invention is intended for use...
5805696 Echo canceller adaptation technique  
A device for providing conferencing communications. The device comprises: a summing circuit for forming a signal sum equal to a sum of signals received from at least three information signal...
5799078 Echo canceller  
Digital filters are used to simulate the transmission function of a real system by means of echo cancellers, where a high-speed digital signal processor with a large memory is needed to compute...
5796637 Apparatus and method for filtering event signals  
A system for filtering multiple event signals from multiple event-generating sources. A selection circuit receives the multiple event signals and selects one of the event signals. A filter circuit...
5793820 Automatic adaptive filtering according to frequency modulation rate  
A transversal adaptive finite impulse response (FIR) filter is modified for automatically filtering modulated signal components from a received signal based on frequency modulation rate....
RE35867 Method and apparatus for controlling coefficients of adaptive filter  
A method or apparatus for controlling coefficients of an adaptive filter (3) for identifying unknown system or predicting periodic signals by correcting coefficients of the adaptive filter (3) in...
5790440 Apparatus for estimating filter coefficients  
An apparatus for estimating filter coefficients operates in a system which includes a filter simulating characteristics of an unknown signal transmission system based on a signal provided to the...
5787023 Digital filter device for electronic musical instruments  
A digital filter device, for an electronic musical instrument, comprises: filter coefficient generation means for generating a set of filter coefficients in consonance with a designated resonance...
5784304 Adaptively controlled filter  
An rms value of a sum signal series x=en+vn calculated by adding a noise series to an error signal series of a known signal series and an unknown signal series, is calculated by an rms calculator....
5784300 Methods, apparatus and systems for real time identification and control modes of oscillation  
A system for real time identification of modes of oscillation includes a sensor, an observer, a controller and an actuator. The sensor senses a controlled system such as a combustor, and generates...
5784419 Efficient digital filter and method using coefficient precombing  
A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The...
5784297 Model identification and characterization of error structures in signal processing  
A method for finding a probability density function (PDF) and its statistical moments for an arbitrary exponential function of the form g(x)=αxm e-βx.spsp.n,00, m>-1 are real...
5781463 Adaptive digital filter with high speed and high precision coefficient sequence generation  
An adaptive digital filter includes a finite impulse response digital filter for performing a convolution calculation by multiplying a code sequence with a coefficient sequence, and a coefficient...
5777914 Technique for reducing power consumption in digital filters  
In a digital filter having tap coefficients, a gain element is employed to scale the filter output. The gain element is controlled by an error monitor element which runs an adaptive process in...
5777913 Resolution enhancement of fixed point digital filters  
An extended coefficient resolution range is provided in an adaptive filter arrangement by utilizing several filters, in combination, to represent the extended resolution range. The coefficients of...
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...
5774564 Active controller using lattice-type filter and active control method  
An active controller suppressing an incoming acoustic wave by active control includes a signal processing unit filtering, an input signal corresponding to the incoming acoustic wave to generate an...
5768313 Adaptive equilizer  
An adaptive equalizer performs adaptive signal processing on an input digital signal passing through a transfer path so as to minimize an equalization error and sends out a digital signal obtained...
5768166 Adaptive filter for electrical supply line noise  
A filter system is provided to remove electrical supply line noise at a first frequency from an input signal to a medical monitor. An arithmetic unit produces an intermediate signal having a...
5764552 Method for adjusting an adaptive exponential filter  
A method for adjusting an adaptive exponential filter, especially for noise reduction. The input of the filter is supplied with a series of time-discrete input signals containing both data and...
5757684 Adaptive co-channel interference canceler using spectral symmetry  
A co-channel interference canceling system that uses adaptive filters exploiting the short-term spectral symmetry of narrow-band FM signals. The carrier frequency of a signal-of-interest is...
5751902 Adaptive prediction filter using block floating point format and minimal recursive recomputations  
An adaptive prediction filter which provides recursive calculation of prediction coefficients from sampled values of segments of a sampled audio signal. In order to obtain improved computation...
5745396 Pipelined adaptive IIR filter  
A pipelined adaptive infinite impulse response (PAIIR) filter is disclosed including an adaptive section and a non-adaptive section, where the PAIIR filter is responsive to first and second input...
5734598 Low power filter coefficient adaptation circuit for digital adaptive filter  
An adaptive filter for use in disk drive systems includes coefficient adaptation circuitry operating at a slower rate than the filter and consequently at a reduced power level. The adaptive filter...
5721694 Non-linear deterministic stochastic filtering method and system  
A method and system for filtering a noisy input comprised of an information signal and a noise signal. No prior time domain value information or frequency domain parameter information on the...
5721772 Subband acoustic echo canceller  
In a subband acoustic echo canceller, FG/BG filters are provided in M ones of N subbands into which the received signal is divided, and adaptive filters are provided in the other remaining...
5721782 Partitioned echo canceler utilizing decimation echo location  
The present invention includes an adaptive filter (40) for use within an echo canceler. The adaptive filter operates in a first mode for performing Decimation Echo Location (DEL). During the DEL...