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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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WO/1993/000741A1 |
The method of the present invention generates an optimal adaptive filter update coefficient by first generating three error signals using a signal input and three update coefficients (301-303). Mean Square Error (MSE) values are estimate...
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WO/1992/016897A1 |
A dynamical system analyser (10) incorporates a computer (22) to perform a singular value decomposition of a time series of signals from a nonlinear (possibly chaotic) dynamical system (14). Relatively low-noise singular vectors from the...
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WO/1992/016054A1 |
A signal weighting system for associating a confidence level with portions of a communication signal transmitted upon a multipath channel (44) and received by a receiver (76). A signal received by the receiver is equalized by an equalize...
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WO/1992/010876A1 |
A prefilter (5) for an audio system comprising a loudspeaker (1) in a room (2), which corrects both amplitude and phase errors due to the loudspeaker (1) by a linear phase correction filter response and corrects the amplitude response of...
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WO/1992/010029A1 |
Adaptive decision feedback equilizer apparatus for processing information including a data input buffer (34), a gain acquisition circuit (42), a timing acquisition circuit (40) operative to generate timing error signals, a synchronizing ...
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WO/1992/005501A1 |
An adaptive filter includes a memory (52) for storing test signals and is down loaded from a host computer via an optional interfacing device (54). A memory (56) is used for storing signals during processing. A clock (58) operates at a f...
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WO/1991/015814A1 |
The invention relates to a process and circuit arrangement for correcting the frequency response of a signal and/or affecting interference in a regulating circuit. Here, high frequencies are summed in the signal and/or the transfer behav...
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WO/1991/012579A1 |
A digital virtual earth active cancellation system (14) which receives a phenomena input signal (r) representing residual phenomena to be cancelled and has an adaptive filter (44) which generates a cancellation signal (y). A system impul...
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WO/1991/006148A1 |
An in-wire active cancelling system for cancelling undesirable repetitive signal components from a primary electronics signal comprising desired intelligent signal components and undesirable repetitive signal components. The primary elec...
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WO/1991/005305A1 |
A method and an arrangement for performing an approximate division of a constant number by a variable number in binary form. The variable number is presumed to consist of a character bit and a plurality of bits which state the absolute v...
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WO/1991/002407A1 |
A digital decision feedback equalizer is disclosed in which compensation for the post-cursors of the impulse response of the transmission channel is divided up into two regions. A first region (70) encompasses the initial rapidly changin...
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WO/1991/001526A1 |
A digital filter is designed by characterizing a desired filter passband in the frequency domain, transforming this representation into the time domain, selecting weighting coefficients at periodically spaced intervals from this transfor...
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WO/1990/015495A1 |
Signals from terrestrial emitters can reach the receiver by reflections over several paths and be superimposed in the receiver. In order to equalize digitally coded signals, test sequences of agreed structure are transmitted before the u...
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WO/1990/013185A1 |
A method and arrangement for avoiding erroneous echo-elimination and/or equalization resulting from non-linearities of a D/A-converter (12) and/or an A/D-converter (15) in a telecommunication system, an error signal (en) being formed for...
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WO/1990/004906A1 |
A comb filter for separating the brightness signal from the chrominance signal of an FBAS signal should suppress, as far as possible, interference effects in the vertical direction during high-frequency signal jumps or colour transitions...
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WO/1990/002447A1 |
A signal processing system, especially for use in vibration control, wherein noise-free signals inductive of the timing of a primary source and of the timing of at least one interfering secondary source of periodic vibrations are provide...
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WO/1990/002380A1 |
A cancellation system (10) including a processor (24) having single adaptive filters (44, 46) adapting its filtering characteristic as a function of a phenomena signal and phenomena timing signal and a phase circuit to maintain the adapt...
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WO/1989/012360A1 |
An adaptive, digital filter including a non-recursive part and a recursive part, and which can be updated in a simple and reliable manner. The recursive part of the filter has a plurality of separate, permanently set recursive filters (1...
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WO/1989/008266A2 |
A better signal-to-noise ratio is obtained during measurements with the disclosed process by selecting an optimized base (A') composed of n scanning functions (S1, S2, ..., Sn). After the scanning measurement values (f*) are projected by...
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WO/1989/007864A1 |
The effects of multipath and other interference signals in communication receivers are reduced by using adaptive signal processing. The feedback of the adaptive signal processor (104) is changed so that an external reference signal is no...
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WO/1989/000722A1 |
An adaptive noise cancellation system reduces undesired noise in a closed loop control system by injecting an adaptively constructed noise cancellation signal at an appropriate point in the closed control loop. The generation of a compen...
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WO/1988/009537A1 |
A fast median filter (22) is disclosed for filtering high frequency noise from signals, such as, signals (10, 14) from a radio altimeter. The filter (22) continuously provides the median of a predetermined number of points of the signal,...
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WO/1988/007788A1 |
An I-Q channel adaptive line enhancer has bandpass filters (20, 78, 86) with passbands that can be widened to well beyond the band that is actually being processed by the adaptive line enhancer. This eliminates the requirement of filteri...
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WO/1988/007790A1 |
The weights of least mean square (LMS) adaptive filter are updated with a different set of taps than are used to form the output of the adaptive filter in the adaptive processing device of the present invention. As a result of performing...
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WO/1988/007789A1 |
The reference channel, the narrowband channel, and the error feedback channel are all constructed with analog components, while the adaptive processor is constructed with digital components. Unavoidable analog time delays in the narrowba...
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WO/1988/004116A1 |
A data communication system, comprising a first and a second transceiver (20, 22) coupled together through a transmission channel (24), the transmission channel (24) having transmission characteristics. A measurement circuit (110) is cou...
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WO/1988/003341A1 |
An echo canceller in a system having a long impulse response such as in an acoustic system, employing a fast Fourier transform advantageously used in view of the amount of calculations. To solve the problem of a long delay, the impulse r...
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WO/1988/002954A1 |
A filter circuitry for disturbed signals of changing frequencies. The disturbed signals are supplied to a first adaptive ladder filter (3) and to a second adaptive ladder filter (5), via a high-pass filter (4). In time intervals determin...
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WO/1988/001409A1 |
A method and apparatus for processing signals from a sensor system including a distributed Kalman filter utilizing distributed data processing techniques to determine various system states (e.g. position, velocity, attitude, etc.). Syste...
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WO/1986/003919A1 |
In a FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an effort to steer the pass band of a tunable ba...
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WO/1986/003594A1 |
In an image processing system for elimination of speckle a signal derived from a scan is passed to a statistical processor (21). An output characteristic of a statistical parameter of the local value of this image signal is passed to a c...
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WO/1985/002509A1 |
Digital signals which are sent each with their own frequency are corrected for frequency-dependent attenuation of the transmitting medium in a filter (5) so as to maintain a desired relationship between the amplitudes of the signals afte...
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WO/1985/001586A1 |
A filter (36) for use in filtering noise from cyclical signals have a data component and a noise component in which a predetermined number of the cyclical signals are averaged to produce an average signature signal (76). The average sign...
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WO/1984/002814A1 |
An improved method and means of determining reflection coefficients that characterize an electrical signal obtains characteristics of an all-zero inverse lattice filter. The reflection coefficients are obtained by filtering the signal, s...
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WO/1984/001641A1 |
In adaptive filters (100), under certain incoming signal conditions the tap gain coefficients (H(K)) tend to drift toward relatively large values. This condition has been countered by taking so-called leakage (L(K)) into account in gener...
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WO/1984/000260A1 |
Loop gain normalization is employed in adaptive filters to control weighting of the filter characteristic updates in order to converge properly to a desired filter characteristic. Filter stability and rapid high quality convergence is re...
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WO/1983/000784A1 |
The dispersive effects of frequency selective fading in a digital, FM, or AM radio system are reduced by means of an adaptive equalizer (11) comprising a cascade of feed-forward stages (1, 2, ...N), each of which includes: a first parall...
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WO/1982/004488A1 |
Various implementations of a technique are presented for capitalizing on signal correlation in a manner for providing usable frequency information. In a specific embodiment, a filter (51) is adapted to a signal component of an input sign...
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WO/1982/003145A1 |
An energy discriminator (103) is employed in conjunction with an adaptive filter to control updating of the filter transfer function characteristic. Specifically, the energy discriminator (103) is employed to distinguish whether any sign...
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WO/1982/001948A1 |
A signal filter method and apparatus for removing portions of a signal indicative of erroneous data, an exemplary apparatus including means (74, 76) for receiving the signal, means (122, 124, 126, 130, 138) for adjusting a threshold by i...
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WO1982000228A1 |
In a communication system for transmitting information over a dispersive link, a transmitted message is assembled to contain alternately arranged known and unknown pluralities of data symbols. At the transmitter, the known data symbols m...
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WO/1981/001089A1 |
Tap coefficient drift in a fractionally spaced equalizer (10) is minimized by adding signal energy (n(t)) to the received data signal (sr(t)) at frequencies where the sampled channel transfer function has substantially zero gain.
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WO/1981/000797A1 |
In a multipoint data communication system using quadrature-amplitude modulation, a master modem (20) and a plurality of tributary modems (11a, 11b...11n) are interconnected via respective transmission channels (13a, 13b... 13n, 16). Adap...
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WO/1980/002897A1 |
Adaptive filters are commonly used in echo cancelers and automatic equalizers. Usually adaptive filters include a tapped delay line and apparatus coupled to the delay line for producing a tap coefficient signal whose sign and magnitude i...
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WO/1980/001863A1 |
A quadrature amplitude modulated (QAM) data signal transmitted at T symbols per second is sampled in a data receiver at a rate of 2/T samples per second and applied to a transversal-type equalizer structure (25, 46, 34, 35) having taps s...
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WO/1980/001348A1 |
Portions of an adaptive equalizer (17) can be used for exact preamble synchronization by modifying the digital filter section to recognize pre-determined sequences of signals in the received signal. This may be accomplished by applying t...
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JP2024050782A |
A system and method for compensating for mechanical acceleration in a reference oscillator. In a communication system 100, a reference oscillator 102 generates an oscillator output signal 103, and an accelerometer 104 on the same platfor...
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JP7451839B2 |
To provide a filtering device and a control device for a motor, capable of stably suppressing load and vibration of the motor.A filtering device 1 comprises: an adaptive filter 53 that is arranged between an input terminal 51 and an outp...
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JP7452334B2 |
To obtain a reverberation suppression device, a reverberation suppression system, a reverberation suppression method, and a program that suppress a residual error of a received waveform.Provided is a reverberation suppression device that...
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