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WO/1996/020551A1 |
In a receiver for signals in a multilevel partial response class-IV communication system, the coefficients of a digital adaptive equalizer need to be updated to minimize the error due to noise and signal distortion. After initial converg...
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WO/1996/020450A1 |
An adaptative filter for use in disk drive systems includes coefficient adaptation circuitry (48) operating at a slower rate than the filter and consequently at a reduced power level. The adaptive filter receives input data samples corre...
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WO/1996/016495A1 |
A controllable, non-recursive filter arranged in the signal propagation path upstream of a demodulator is used to correct distortions of two data flows (I, Q) quadrature modulated on a common carrier. The demodulated data flows (I, Q) ar...
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WO/1996/014634A1 |
An active control method and apparatus for controlling vibration or sound wherein the computational burden to adaptively update the control filter within the update model is reduced. The apparatus includes means (not represented) for pro...
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WO/1996/008867A1 |
In adaptive digital filtering, first steps of adapting a filter coefficient dependent on a received data sample, and second steps of filtering by applying an adapted filter coefficient to a received data sample, are alternated so that ad...
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WO/1996/002981A1 |
A method and apparatus are provided for echo cancelling which includes double-talk immunity. The echo canceller (15) according to the present invention includes a double-talk detector (17) which uses an adaptive double-talk detection thr...
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WO/1995/034983A1 |
The invention relates to an adaptive microphone arrangement with one or more microphones (MP1, ..., MPn) comprising a signal detecting arrangement for detecting target input signals, a signal forming arrangement and signals storing means...
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WO/1995/028766A1 |
An apparatus (100) and a method for substantially cancelling impulsive noise from data. Such substantial cancellation is achieved by converting the time-domain data into its corresponding frequency domain by a time to frequency domain co...
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WO/1995/020841A1 |
An active control system for multiple interacting channels to control a constant noise or vibration consisting of first (3) and second (8) sensor means adapted to provide reference and residual signals respectively, a first and second fi...
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WO/1995/018523A1 |
For encoding sound received as a stream of multibit input samples, from a finite length sequence of input samples, an instantaneous audibility threshold characteristic is determined. Next, a shaped, dither determined, signal is subtracte...
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WO/1995/017784A1 |
The invention relates to a method for adaptation to an echolocation in an echo canceller comprising an output port, an input port, an adjustable delay unit (43) compensating for the pure delay component in the echo path between the echo ...
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WO/1995/012919A1 |
An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR (22) and contin...
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WO/1995/008890A1 |
Circuitry and concomitant methodology for demodulating Direct-Sequence, Spread-Spectrum Code-Division Multiple-Access (DS/SS CDMA) channel signal using multiple samples per transmitted symbol and a minimum mean squared error criterion to...
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WO/1995/006986A1 |
The present invention provides a fast affine projection adaptive filter (100) for frequent parameter updating and fast convergence with low complexity. The adaptive filter (100) generates an echo estimate signal based on an excitation si...
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WO/1995/005047A1 |
Our audio processing system for use in teleconferencing systems includes a microphone (1-25), receiver (1-26), and substantially the same comb filter (1-42) and frequency scaler (1-60) at each station for reducing acoustic echo and incre...
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WO/1994/029956A1 |
A decision feedback equalizer is suitable for use with a bipolar return-to-zero receiver. The equalizer determines an output Y(n) (160) based on a compensated received value X(n) (104) and a correction factor, D(n) (141). After receiving...
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WO/1994/028499A1 |
A complex adaptive Finite-Impulse-Response filter (10) for processing complex digital data having real and imaginary data portions that includes a first data path (17) for receiving and processing the real data portion of the complex inp...
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WO/1994/027787A1 |
In order to manufacture a grinding tape (11) which consists of a film substrate (2) and a grinding layer (10) laminated on one surface thereof, and which has a plurality of recesses (9) in the surface of the grinding layer (10), a film s...
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WO/1994/025960A1 |
A transmission system is described comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (...
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WO/1994/025961A1 |
A transmission system is proposed comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (1...
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WO/1994/024662A1 |
A method of calculating filter weights for a multichannel compression wave cancellation system (10) is characterized by the following steps: system configuration (48), calibration data collection (50), calibration data preprocessing (52)...
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WO/1994/023495A1 |
Techniques for optimal processing of signals which fit continuous-state and discrete-state system models are known. This invention concerns the processing of signals which have characteristics that are not exclusive to either the continu...
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WO/1994/021041A1 |
A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) by a transfer function defined in the frequency domain by LN samples (H(K)), wherein the transfer function is filtered by a time window (g1) of width ...
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WO/1994/019754A1 |
A method for adjusting an adaptive exponential filter (3), especially for noise reduction. The input of the filter is supplied with a series of time-discrete input signals (Xk) containing both data and noise. An estimate of the standard ...
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WO/1994/019872A1 |
One-bit analog-to-digital converters (ADCs) and digital-analog-converters (DACs) employ an adaptive filter. The filter has two regimes of operation: variable gain within the passband of the filter under low-level signal conditions and fi...
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WO/1994/018752A1 |
A method is provided of updating an estimated channel impulse response of a maximum likelihood sequence estimator within a radio receiver (12 and 13). The method includes the steps of computing a rate of change of a channel impulse respo...
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WO/1994/017762A1 |
This invention relates to an improved method of on-line system identification for use with active control systems. The method requires less computation and reduces the problem of coefficient jitter in the filters (12, 22) of the active c...
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WO/1994/015427A1 |
An apparatus is provided for maximum likelihood sequence estimation. The apparatus includes a first maximum likelihood sequence estimator (44) in a signal path for flat fading and an at least second maximum likelihood sequence estimator ...
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WO/1994/010760A1 |
Described is an echo compensation device with a digital transversal filter for an information transmission equipment as well as 4/2-wire interface with at least one such device. The invention provides a scale-value device which analyzes ...
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WO/1994/010789A1 |
An echo canceler (10) is controlled and operated during hangover time between a double talk condition and a single talk condition for a more natural residual echo cancellation. The adaptive gain and the residual suppression threshold nec...
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WO/1994/009564A1 |
An apparatus and method for filtering intersymbol interference from an information signal generated from a storage medium. This apparatus utilizes a delay line (50), gain devices (51) summing devices (52), and has specified transfer func...
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WO/1994/007308A1 |
An adaptive filter for the approximation of a read-in set function F in a function space, containing a set of n elementary filters gb, n being an integer 1. The elementary filters cover a sub-space in the function space, the parameters o...
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WO/1994/006233A1 |
A combined equalizer and roll-off filter is formed from a fractional transversal equalizer, certain of the tap weights of which are fixed, while the remainder are variable. In particular, those taps which are at integral multiples of the...
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WO/1994/005006A1 |
Apparatus for attenuating an unwanted signal, e.g. a speech signal, in a mix of signals, e.g. a broadcast audio signal, includes an adaptive cancellation circuit (30) having an adaptive transversal filter (32) controlled in accordance wi...
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WO/1994/004980A1 |
A digital virtual earth (DVE) cancellation system which receives a phenomena input signal via multiple sensors (1, 2, 3) representing residual phenomena to be canceled, and has adaptive filters (12, 24, 25) for each of the multiple senso...
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WO/1994/005080A1 |
A non-linear filter architecture has a neural network for modelling a non-linear transmission function. The filter input signal f(n), ..., f(n-1), ..., f(n-M), a time index signal i and the values p(n), ..., p(n-i), ..., p(n-M) of the pa...
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WO/1994/002991A1 |
The process of the present invention computes the update (403) to the least mean square channel estimator taps. The update coefficient for each tap is computed independently based on the power of each tap (402) relative to the main tap p...
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WO/1994/001827A1 |
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 measure of the error.
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WO/1994/001932A1 |
A signal processor for extracting chrominance information from a composite video signal has transversal filters (45, 46) developing first and second signals (A and B). A look-up table (47) generates a control signal (C) which is a non-li...
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WO/1994/001981A2 |
An algorithm is described for sparsely updating the filter coefficients of an adaptive filter of an adaptive audio system to facilitate a high sampling rate without excessive processing capacity. Computer simulations are used to illustra...
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WO/1993/021710A1 |
Methodology, and associated circuitry, for encoding (e.g., 200) and decoding (e.g., 900) an incoming data stream (201) utilize a coordinated code constellation (e.g., Fig. 3) that effects robust signal detection in the presence of channe...
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WO/1993/021695A1 |
The invention relates to a method for avoiding self-oscillation in a four-wire loop in conjunction with echo cancellation effected with the aid of an adaptive filter (15). Self-oscillation is avoided for both long and short connections a...
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WO/1993/019418A1 |
In a typical Viterbi demodulator implemented using the add, compare, select (ACS) method, each state in the expected sample sequence model is associated with a hardware module to perform the functions of adding new branch error metrics t...
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WO/1993/016527A1 |
The present invention relates to a method and to an apparatus for ghost cancelling and/or equalizing. A received test signal is compared with an ideal version of this test signal. The coefficients of a correction filter applied to the re...
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WO/1993/015501A1 |
The invention relates to an improvement to a so-called filtered-x active noise reduction system, in which a cyclic reference signal (x), generally synchronous with primary noise (p) to be cancelled, is applied to a control filter (6) tha...
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WO/1993/014566A1 |
Apparatus for reducing the risk of undesirable drifting of the parameters, so-called bursting, of an adaptive echo filter (15), which is coupled between a receiving branch (17) and a transmitting branch (16) included in a four-wire loop....
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WO/1993/008644A1 |
In an element (FLT) for filtering a regulating variable (X, Y) of a regulating system (ACE, FLT, RGL, AFZ, AFP), a multi-layered neuronal network (MNN) is used with an adaptation arrangement (ADAPT) for adapting weight values (w) of the ...
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WO/1993/007688A1 |
A Viterbi equalizer (366) for decoding a pi/4 DQPSK modulated signal. Because symbol values of adjacent symbols of a pi/4 DQPSK signal are offset in phase relative to one another, allowable values of succeeding states of a pi/4 DQPSK sig...
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WO/1993/003544A1 |
In order to compensate for quasi-periodic disturbances in measurement signals, the wanted signal is separated from the disturbing signal by determining from an auxiliary signal a series of trigger moments, a disturbing signal template is...
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WO/1993/000747A1 |
The process of the present invention generates an optimum automatic frequence control signal in an apparatus that has a plurality of adaptive algorithms, each adaptive algorithm having a reference signal with an associated frequency dith...
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