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5703904 Impulse noise effect reduction  
In a receiver system embodying the invention, the amplitude of the input signal is sensed so that when it exceeds a predetermined level, the adaptation of adaptive filters employed in the receiver...
5701262 Tab coefficient updating device of finite impulse-responding adaptive digital filter  
A tab coefficient updating device of an FIRADF capable of greatly reducing the amount of hardware therefor and integrating its tab coefficient updating value operating circuit using a simple...
5696699 Integrated cellular data/voice communication system working under one operating system  
A cellular communication system having all of its components operating under a single system control unit is provided so that the various components of the system can be adjusted as the parameters...
5694474 Adaptive filter for signal processing and method therefor  
This invention is a component of an adaptive filter signal processor whose purpose is to separate a mixture of signals received by each of a plurality of transducers. This invention accomplishes a...
5684827 System for controlling the operating mode of an adaptive equalizer  
An adaptive equalizer decision circuit for a digital television signal, including a field synchronizing signal, consisting of multilevel symbols and a DC offset representing a pilot. The variation...
5682341 Adaptive signal processor using Newton/LMS algorithm  
An adaptive signal processor using a Newton/least mean square (LMS) algorithm, adapted to remove a signal distortion or noise. The adaptive signal processor is adapted to derive an autocorrelation...
5680337 Coherence optimized active adaptive control system  
Coherence optimization is provided in an active adaptive control system. The adaptive control model (16) has a model input (18) receiving a reference signal (8) from a reference input transducer...
5677951 Adaptive filter and method for implementing echo cancellation  
A dynamically regularized fast recursive least squares (DR-FRLS) adaptive filter and method are disclosed which provide O(N) computational complexity and which have dynamically adjusted...
5673213 Adaptive filter  
An adaptive filter for the approximation of a read-in set function F in a function space, containing a set of elementary filters gb, n being an integer ≥1. The elementary filters cover a sub-space...
5668747 Coefficient updating method for an adaptive filter  
A coefficient updating method stops updating filter coefficients for a plurality of adaptive filters when a convergence condition is achieved. Active noise control within a system simulates an...
5657349 Method and apparatus capable of quickly identifying an unknown system with a final error reduced  
Identifying an unknown system by the use of adaptive filers by supplying the unknown system with an input signal, subjecting the input signal to subband analysis to produce subband signals, and...
5644596 Method and apparatus for frequency selective adaptive filtering  
A method and apparatus for performing subband adaptive filtering is proposed. A signal is prefiltered by a set of complementary filters to provide corresponding subbands of the input signal. The...
5640429 Multichannel non-gaussian receiver and method  
A process and system for improving the detection of signals in additive correlated non-Gaussian noise using multichannel data. This improves detection performance of receivers through the signal...
5638311 Filter coefficient estimation apparatus  
An estimation apparatus predicts filter coefficients for an adaptive filter, the response of which emulates the signal transmission characteristics of a known signal. The response thereto is sent...
5638439 Adaptive filter and echo canceller  
An adaptive filter in the form of an FIR or IIR filter performs an adaptive filtering process relative to an input signal using a plurality of tap coefficients. The adaptive filter derives a...
5636151 Adaptive filter capable of removing a residual echo at a rapid speed  
In an adaptive filter, each of first through N-th taps belongs to either one of first through M-th tap groups. A first generating section (31) generates a specific one of the first through the...
5630425 Systems and methods for adaptive filtering artifacts from composite signals  
Analog or digital systems or methods filter an artifact from a signal derived from a biological event comprising sample values arranged with respect to time. The systems and methods generate a...
5629955 Variable spectral response FIr filter and filtering method  
A method and system, for use in a communication system in which data is transmitted in data frames of predetermined time duration, for the positioning of the data within the data frames for...
5623402 Multi-channel inverse control using adaptive finite impulse response filters  
A method and apparatus for multi-channel control of a multiple input, multiple output, servo-driven plant utilizes finite impulse response (FIR) filters to model the inverse of the plant. Each...
5617450 Digital subscriber loop interface unit  
A digital subscriber loop interface unit, connected to a digital subscriber loop, includes an echo canceler for carrying out a echo canceling operation, a decision feedback equalizer for carrying...
5608804 Method of and apparatus for identifying a system with adaptive filter  
A method of and an apparatus for identifying a system which allow a filter coefficient to be updated accurately even if noise is mixed. The apparatus for identifying a system includes an adaptive...
5602929 Fast adapting control system and method  
An active control system having an adaptive filter model in which the effect of transfer functions after the adaptive filter model output are eliminated from the adaption process. The adaptive...
5602765 Adaptive transfer function estimating method and estimating device using the same  
In an adaptive estimation of an acoustic transfer function of an unknown system, a forward linear prediction coefficient vector a(k) of an input signal x(k), the sum of forward a posteriori...
5601088 Systems and methods for filtering artifacts from composite signals  
Analog or digital systems and methods filter an artifact from a composite signal, which comprises sample values arranged with respect to time. The systems and methods select sets of WL sample...
5590154 Equalizer circuit and a method for equalizing a continuous signal  
An equalizer circuit (11) and a method for adjusting tap weights in the equalizer circuit (11) to provide an equalized signal. The equalizer circuit (11) includes an adaptation circuit (16)...
5590121 Method and apparatus for adaptive filtering  
A finite impulse response (FIR) filter characterization is performed using a modified least means squares approach that updates values of FIR filter taps as groups of taps, periodically. For the...
5586068 Adaptive electronic filter  
A programmable and adaptive electronic filter for filtering digital signals. The filter uses a table which contains the outputs corresponding to all possible inputs, so that the filter may be...
5586143 Apparatus and method for processing data signals in a digital receiver  
An apparatus and method as shown in for processing digital signals in a communications system including a non-equaliser detector and a equaliser each for receiving an input signal and outputting a...
5581494 Adaptive discrete-time transversal filter  
Adaptive discrete-time filters, as used, for example, in echo cancellers responsive to input signals, more specifically speech signals, which can be modelled with an autoregressive process of the...
5581495 Adaptive signal processing array with unconstrained pole-zero rejection of coherent and non-coherent interfering signals  
Broadband coherent and incoherent interfering signals (jammers) are suppressed by using differencing and summing operations in an adaptive signal processing array composed of a plurality of signal...
5572443 Acoustic characteristic correction device  
An acoustic characteristic correction device includes a section for setting a desired characteristic of a response characteristic in a reproduction system including a sound field, a section for...
5568411 Method and apparatus for using polarity-coincidence correlators in LMS adaptive filters  
A method of updating the coefficients of an adaptive filter, where the filter utilizes a polarity-coincidence correlator (PCC) as part of an iterative update equation. The expression for the...
5563817 Adaptive canceller filter module  
An adaptive canceller filter module having signal sensors and signal filters in a circuit for use with filtered-x algorithms to adapt the coefficients of one of said filters to minimize the...
5555272 Signal processing device using several different filterings, especially for audio-frequency coding of voice signals  
The device comprises a first input (E1) and a first output (S1) which are capable respectively of receiving and delivering a plurality of analog signals and corresponding digital signals having...
5553014 Adaptive finite impulse response filtering method and apparatus  
A signal processing method and apparatus including a digital finite impulse response filter wherein the error caused by slow asymptotic convergence of the filter's adaptive coefficients is...
5544201 Signal suppressing apparatus  
A signal suppressing apparatus for suppressing undesired signal components, in which a first filter electrically simulating a propagation system A of a physical phenomena such as a sound,...
5541867 Method and apparatus for decorrelation of mutually contaminated digital signals  
An apparatus and method for decorrelating pairs of mutually contaminated channels in a multi-channel digital signal including two identical data processing paths and a feedback path. Each pair of...
5539773 Method and apparatus for ghost cancelling and/or equalizing  
A method for signal equalization/ghost cancellation with an equalizing filter includes synthesizing a first equalizing filter function (LMS 1) with N (an integer) taps and associated coefficients....
5539774 Dual decision equalization method and device  
An adaptive equalization method and device which provides for the equalization of symbol sequences sent through fading multipath channels with time and frequency dispersion. By using a trainer...
5537368 Enhanced adaptive statistical filter providing improved performance for target motion analysis noise discrimination  
An adaptive statistical filter system for receiving a data stream comprising a series of data values from a sensor associated with successive points in time. Each data value includes a data...
5535150 Single chip adaptive filter utilizing updatable weighting techniques  
A single chip adaptive filtering system including an finite impulse response (FIR) filter and circuitry for calculating updated weighting coefficients for use in associated multiplying...
5535149 Duplex adaptive digital filter and method of operation  
An adaptive filter system has a first and a second filter subsystem of like construction, each having a series of delay elements for imparting a unit delay of one sampling interval to successive...
5532950 Dynamic digital filter using neural networks  
The present invention provides an apparatus for decoding and classifying a digital audio input signal and for reconstructing the digital audio input signal, so that when the reconstructed signal...
5528627 Signal reception system comprising an adaptive filter  
In a signal reception system comprising an adaptive filter having a plurality of filter coefficients and producing a filtered signal, a differential detection circuit for carrying out differential...
5524149 Circuit arrangement for echo suppression  
In an adaptive filter a frequency domain filter is used to enhance the convergence properties of the filter for strongly correlated signals.To reduce the amount of delay in the filter the impulse...
5517435 Method of identifying an unknown system with a band-splitting adaptive filter and a device thereof  
A method and apparatus for identifying an unknown system to provide less computation and a shorter convergence time by controlling the number of taps of adaptive filters corresponding to each...
5515402 Quadrature filter with real conversion  
A quadrature decimation filter with real output formed from a mixture of both in-phase and quadrature signals by upconversion and alternating stream combination. The in-phase and quadrature branch...
5513221 Doppler bandwidth dependent estimation of a communications channel  
A device and method of adjusting an equalizer in a digital communications receiver in response to relative velocity between the communications receiver and a communications transmitter. A radio...
5506871 Adaptive equalizing system for digital communications  
An adaptive equalizing system equalizes an unequalized signal and performs carrier recovery for use in a digital communication receiver. An equalizing coefficient is initialized by a constant...
5502747 Method and apparatus for filtering an electronic environment with improved accuracy and efficiency and short flow-through delay  
An improved method and apparatus for filtering an electronic environment with relatively high accuracy and efficiency and relatively short flow-through delay ("latency") is disclosed. Embodiments...