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WO/1999/018666A1 |
A new signal processing method and a signal processing engine which can achieve extremely fast responsiveness to instantaneous changes in the behavior of the signal, and maintain the accuracy of standard harmonic methods. The signal proc...
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WO/1999/016170A2 |
Method for separating at least two signals from a mixture of signals, in which method the number of different mixtures is at least as great as the number of signals to be separated, the method comprising a modified criterion based on a c...
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WO/1999/010715A1 |
A method and an apparatus for distinguishing systematic artefacts from noise involves localising functional noise in the vicinity of predicted functional peaks. The method is particularly relevant to detection and tracking of time-varyin...
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WO/1999/007071A1 |
An adaptive filter is provided which has fixed point or floating point data stored in a data RAM (74) and block scale floating point coefficients stored in a coefficient RAM (84). The data and coefficients are utilized in a filter algori...
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WO/1998/059418A2 |
A blind equalization method and adaptive filter device is presented which provides for optimal performance with minimal computational complexity. Recognizing that all realizable filters have residual noise characteristics, the optimizati...
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WO/1998/058450A1 |
A set of generalized architectures, frameworks, algorithms, and devices for separating, discriminating, and recovering original signal sources by processing a set of received mixtures and functions of said signals based on processing of ...
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WO/1998/053595A1 |
In order to reduce acoustic echo and restore stereophonic sound in a digital transmission system of sound signals on P transmission channels, between a local site and one or several remote site(s), comprising several microphones and loud...
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WO/1998/052282A1 |
An efficient implementation of a multirate filter with delayed error feedback is disclosed. The multirate filter prevents the instruction processing rate requirement from increasing by performingthe interpolation and decimation in the LM...
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WO/1998/047227A1 |
A dual-processing interference cancelling system and method for processing a broadband input in a computationally efficient manner. Dual processing divides the input into higher and lower frequency bands and applies adaptive filter proce...
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WO/1998/042082A2 |
The invention relates to a method and arrangement for forming an address, the arrangement being used for forming a corrector table (130) address employed in signal predistortion that is used for compensating for signal distortions. The d...
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WO/1998/042083A1 |
A method of coding an audio signal comprises receiving an audio signal $i(x) to be coded and transforming the received signal from the time to the frequency domain. A quantised audio signal $i(x) is generated from the transformed audio s...
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WO/1998/038582A1 |
A digital signal processor (100) that is used for echo cancellation computations is disclosed, which includes parallel multiplier/adders (102/104 and 106/108), an input signal sample memory (120), and a plurality of accumulators (112, 11...
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WO/1998/015901A1 |
A novel process 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 system down to a predetermined level or...
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WO/1998/016021A1 |
A method and apparatus for separating and removing distortion from interfering co-channel singals and suppressing adjacent-channel interfering signals of the Gaussian Minimum-Shift Keyed (GMSK) or other MSK type with filtering structures...
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WO/1998/009477A1 |
A signal correcting device (12) which can easily, quickly, and surely correct the characteristics of a transmission system, such as the loudspeaker, etc., having nonlinearity. The signal correcting device (12) supplies input signals (u) ...
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WO/1998/008167A1 |
A signal processing method for determining parameters of a linear Gaussian system to remove a Gaussian noise component, comprising processing received data by a finite-dimensional filter to obtain expectation data, processing the expecta...
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WO/1998/006185A1 |
An echo cancelling system for communication systems. The system includes an adaptive filter (34) that processes the speech signal re-constructed by a speech decoder (30) to generate an echo estimate. The echo estimate is subtracted from ...
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WO/1998/000836A1 |
A device for analysis and filtration of sound which comprises at least one frequency-linear filter, at least one frequency-logarithmic filter and a weighting means for the combining and non-linear weighting of the output signals from the...
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WO/1997/050186A2 |
An adaptive system and method for reducing interference in a signal received from an array of sensors. Adaptive filters are used to generate cancelling signals that closely approximate the interference present in the received signal. The...
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WO/1997/049179A1 |
For a digital circuit arrangement for influencing the frequency response of a digital audio signal as a function of frequency and/or amplitude, the input signal of the circuit arrangement is applied to a signal filter (3) having variable...
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WO/1997/048192A1 |
In a multi-subscriber radio system (1) in which the signals are given a subscriber-specific form, after a transmission via one and the same channel (4), the mixture of signals received at a subscriber's station (5) is separated in two st...
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WO/1997/042742A2 |
A transmitter is disclosed for transmitting a digital information signal having a specific first sampling frequency (fs1) via a transmission medium. The digital information signal is lowpass filtered (10) and down sampled (12) so as to o...
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WO/1997/038552A1 |
In a video conference facility, an echo cancelling device is provided which comprises an adaptive finite impulse response filter (38) operable to sample the input signal to a loudspeaker (30) and to model, on the basis of that signal, th...
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WO/1997/035384A1 |
The invention relates to a receiving method and a receiver in a system in which received signals comprise a number of summed signal components of which at least some are unknown, and the receiver comprising a means (202) for sampling the...
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WO/1997/034370A1 |
A fully-integrated mixed signal transceiver chip (112) for a network application is provided that combines analog (114) and digital (116) processing circuitry into one chip (112) for transmitting and receiving signals on the network. An ...
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WO/1997/028527A1 |
Noisy speech parameters are enhanced by determining (22, 26) a background noise PSD estimate, determining (18) noisy speech parameters, determining (20) a noisy speech PSD estimate from the speech parameter, subtracting (30) a background...
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WO/1997/027671A1 |
An adaptive Decision Feedback Equaliser (DFE) is trained using the Delayed Least Mean Square (DLMS) algorithm. A delay, equal to the feedforward filter length, is introduced in the filter coefficient update, which allows the DFE to be re...
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WO/1997/027670A1 |
Training sequence pulses are periodically inserted between data packets transmitted over a cable television system from a headend unit to a subscriber. By comparing the transmitted sequence pulses with a generalized training sequence at ...
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WO/1997/024802A1 |
In a receiver system (100) embodying the invention, the amplitude of the input signal (134) is sensed so that when it exceeds a predetermined level (202) the adaptation of adaptive filters (145, DFE) employed in the receiver is inhibited...
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WO/1997/024805A1 |
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 a first filter represents a high portion...
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WO/1997/024804A1 |
A measure of a degree of convergence in an adaptive filter arrangement is derived from the comparison of an amount of adaptation occurring in the adaptive filter arrangement, over a predetermined period of time, with a normalizing value ...
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WO/1997/024814A1 |
In a multi-channel receiver system (100) embodying the invention, a "trained" receiver channel which is active and propagating data signals may be used to train any other receiver channel. Each receiver channel of the system has an input...
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WO/1997/019447A1 |
A decoder capable of decoding audio signals encoded using analog noise reduction techniques, particularly Dolby SR, is implemented by means of digital signal processing. The typical decoding paradigm used by analog Dolby SR decoders is m...
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WO/1997/019448A1 |
A decoder capable of decoding audio signals encoded using analog noise reduction techniques, particularly Dolby A, is implemented by means of digital signal processing. The encoded signal passes through one or more digital filters, produ...
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WO/1997/018442A2 |
The invention is based on the use of the principles of Lange's Fast Kalman Filtering (FKFTM) for large process control, prediction or warning systems where other computing methods are either too slow or fail because of truncation errors....
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WO/1997/016942A1 |
The feedback caused between the output (39) and the input (30) of an amplification path (54, 42, 56, 60, 62, 64) is reduced by providing a delay (60) in the amplification path, passing through the amplification path a signal having an au...
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WO/1997/015124A1 |
In a dual filter echo cancellation method a new quality measure (qa, qp) provides the basis for a new filter selection and transfer method. The quality measure represents the performance of a filter in the adaptive echo canceller. Accord...
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WO/1997/011527A1 |
In source coding use can be made of switching filter banks in order to adapt the filter bank to properties of the signal to be coded. If it is not allowed that the switching introduces transient phenomena in the reconstructed signal, so-...
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WO/1997/011538A1 |
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 estimates the relative propagation delays among the tra...
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WO/1997/009790A1 |
A decimating PRML signal processor system (10) for processing a PRML data signal includes: an adaptive filter circuit (22) for receiving and for shaping the data signal; a gain control circuit (30), responsive to the adaptive filter circ...
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WO/1997/009782A1 |
The invention concerns an adaptive filtering process for time input signals (X(n)) in the frequency domain. Filtering is carried out on blocks (xm(k)) of m successive signals ((x(n)), ... x (n+m-1))), by multiplying the Fourier transform...
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WO/1997/005709A1 |
A method and apparatus for adaptively despreading a direct sequence spread spectrum signal. The direct sequence spread spectrum signal is provided to transversal filter (101). The output of filter (101) is despread by despreader (120) to...
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WO/1997/001101A1 |
A residual error based compensator for the frequency domain bias of an autoregressive spectral estimator is disclosed. LPC analysis (16) is performed on the residual signal and a parametric PSD estimate (18) is formed with the obtained L...
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WO/1996/038933A1 |
A system and method for detecting convergence in an echo canceller prevent false convergence from occurring as a result of receiving only tones in an input signal. An adaptive filter (304) is used in an echo canceller (300) to estimate a...
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WO/1996/035259A1 |
The invention relates to a method for modelling signal spectrum by means of linear prediction and an apparatus for realising the method. In said method, there is formed a prediction for a future signal as a linear combination of earlier ...
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WO/1996/035266A1 |
A digital signal adaptive filtering method and device are described. The transmitted signal (xn), which is representative of a post-transmission distorted source signal (dn), is adaptively filtered (W*) (1001) to generate a filtered tran...
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WO/1996/032776A2 |
In a signal processing system, a signal coming from a microphone (2) is applied to a loudspeaker (6) via a signal processing system (4). Since the transfer function of the loudspeaker (6) to the listeners substantially corresponds to the...
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WO/1996/026573A1 |
A distortion correction device for a path of propagation in transmission systems, in particular mixed electric-acoustic transmission systems such as those used in a particularly advantageous manner in an active sound dampening system, ha...
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WO/1996/025805A1 |
Kalman filtering is applied to obtain a fast converging, low complexity echo (y(t)) canceller (18). An averaged diagonal Riccati equation allows optimal time varying adaptation gains K(t) to be precomputed, or computed online with a smal...
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WO/1996/024127A1 |
This invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal containing both an information signal, such as speech and noise. The improvements relate to a noise power estimator (3) ...
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