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4797807 Multiple channel fast orthogonalization network  
A method for orthogonalizing inputs with respect to each other. The method omprises the steps of: generating a root structure of N inputs having input order 1 to N, where 2m-1
4792915 Non linear adaptive filters  
A non-linear adaptive filter is described having a linear filter connected in parallel with a non-linear filter. The linear filter provides fast adaption until it has modelled the linear...
4791390 MSE variable step adaptive filter  
A very rapidly converging adaptive filter which uses a variable scale factor for each weight of the filter. The value of the variable scale factor is chosen for each iteration and is based upon...
4787065 Data processing apparatus providing cyclic addressing of a data store in selectively opposite directions  
A data processing apparatus in which a memory (10) is accessed at addresses stored in an address regiser (20). An incrementation circuit (38) successively increments or decrements the address...
4785411 Cascade filter structure with time overlapped partial addition operations and programmable tap length  
A filter structure uses multiple discrete filter circuits which are cascaded to provide a multiple tap filter of programmable tap length. In one form, an FIR filter may be implemented wherein each...
4781201 Cardiovascular artifact filter  
For suppressing cardiovascular artifact from a respiration signal derived from a patient's transthoracic impedance, an adaptive filtering device determines the patient's heart rate, converts the...
4779225 Adaptive digital filter  
An adaptive digital filter which is used, for instance, for a prediction filter in an ADPCM modulator and an ADPCM demodulator, for providing stable operation and minimum phase shift response. The...
4771396 Digital filters  
A transversal finite impulse response, adaptive digital filter comprises three stages (10, 11, 12). The stage (10) is a memory stage which stores input samples x and coefficients. The second stage...
4760540 Adaptive interference cancelling system and method  
An adaptive interference cancelling signal processing system includes N+1 processors for cancelling N interfering auxiliary signals from a primary signal. During a prelook or inactive period of...
4757265 Adaptive eccm signal processor  
An adaptive nonlinear processor in which the desired radar signal together with an interfering signal is mixing with a voltage controlled oscillator and fed to a dispersive filter, the output...
4754419 Adaptive digital filter  
In an adaptive digital filter having a digital filter for simulating a transmission system having indeterminate transmission characteristics through a series circuit of a plurality of...
4752903 Adaptive digital filter for eliminating howling  
An adaptive digital filter is connected in parallel with a transmission system and includes a plurality of delay circuits, a nonrecursive digital filter having coefficient parameters of the delay...
4747068 Adaptive filter  
In an adaptive filter a plurality of outputs (5, 7, 9, 11) of a delay circuit (3) are coupled via coefficient control circuits (21, 23, 25, 27) to a plurality of inputs (91, 93, 95, 97) of an...
4742353 Digital processor for radar signals which can perform adaptive suppression of clutter means of a parametric estimator  
A digital processor for radar signals which can perform adaptive suppression of the disturbance clutter and enhancement of the useful signal of given Doppler frequency. It can approximate the...
4736414 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics  
The method provides the use, for the determination of the estimation echo-channel pulse response, of digital filtering techniques of the transversal adaptive type, and the subdivision of the...
4717951 Adaptive digital filter  
A picture-in-picture television receiver for which the viewer may change the size of the inset image includes an adaptive anti-aliasing filter. Composite video signals which produce the inset...
4696015 Echo correction especially for television broadcast systems  
Echo cancellation is carried out on a received demodulated analog signal. The apparatus comprises an analog transversal filter, a computing circuit for generating the direct coefficients a1 to ar...
4694415 Adaptive digital filter for analog input signals  
An adaptive digital filter is supplied with an alternating current noise signal by a separate reference line. The filter samples input signals and the signal on the reference line several times...
4694451 Adaptive digital filter  
A digital filter comprises a plurality of delay stages 41 such as shift register stages through which an input x(t) is fed. Each of a plurality of individually addressable random access memories...
4694298 Adaptive, fault-tolerant narrowband filterbank  
An adaptive, fail-soft digital filterbank for digitized Doppler-modulated video signals. A plurality of modules are controlled by the impulse filter weighting technique to each respond to a set of...
4674062 Apparatus and method to increase dynamic range of digital measurements  
Disclosed is a method for overcoming one of the limiting factors in applying digital techniques to measuring analog signals over a wide dynamic range, namely, the uncertainty introduced into the...
4649505 Two-input crosstalk-resistant adaptive noise canceller  
A two-input crosstalk-resistant adaptive noise canceller receives a primary input signal including a desired speech signal portion and an undesired noise signal portion and also receives a...
4641259 Adaptive signal processing array with suppession of coherent and non-coherent interferring signals  
Suppression of coherent and non-coherent interferring signals is obtained by a smoothing operation in an adaptive signal processing array by providing a plurality of signal detectors and a...
4591669 Adaptive filter update gain normalization  
Update gain normalization is employed in adaptive filters to control weighting of the filter impulse response updates in order to converge properly to a desired impulse response. Singing, i.e.,...
4589083 Adaptive sinusoidal interference filter  
The invention relates to an adaptive filtering system for cancelling one or more sinusoidal interference signal contained with a desired signal in an incoming signal. A phase-locked loop is used...
4524424 Adaptive spectrum shaping filter  
A transversal adaptive filter with a tap weight computer having a respective first and second input responsively coupled to a respective output and input of the filter, and including spectrum...
4507747 Procedure for shared-time processing of digital signals and application to a multiplexed self-adapting echo canceler  
A self-adapting digital filter having one or more processing modules each possessing a delayed discrete value memory, a coefficient memory, two multipliers-accumulators, a variable-amplitude shift...
4494214 Apparatus for generating scaled weighting coefficients for sampled data filters  
A method is described for generating continuously variable sets of weighting coefficients for application to weighting circuits of a sampled data filter. The generated coefficients are produced by...
4491701 Adaptive filter including a far end energy discriminator  
An energy discriminator is employed in conjunction with an adaptive filter to control updating of the filter transfer function characteristic. Specifically, the discriminator is employed to...
4479036 Echo control system  
An echo control system for an adaptive echo canceller which forms a pseudo-echo or its residual signal by combining respective outputs from a tapped delay line holding an estimated characteristic...
4467441 Adaptive filter including controlled tap coefficient leakage  
In adaptive filters, under certain incoming signal conditions the tap coefficients tend to drift toward relatively large values. This condition has been countered by introducing so-called leakage...
4438504 Adaptive techniques for automatic frequency determination and measurement  
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...
4403298 Adaptive techniques for automatic frequency determination and measurement  
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...
4377793 Digital adaptive finite impulse response filter with large number of coefficients  
A digital adaptive finite impulse response (AFIR) filter having a large number of coefficients is composed of two or more separate filter units. The first filter unit computes response samples ho...
4355368 Adaptive correlator  
A correlator which is capable of correlating two or more signals of unknown frequency and bandwidth receives inputs on each of two or more channels. For the case of a two-channel, or pairwise,...
4349889 Non-recursive filter having adjustable step-size for each iteration  
Arrangement having a non-recursive filter and means for weighting a sequence of delayed versions of the input signal in accordance with a sequence of coefficients which are each adjusted...
4339803 Video frame store and real time processing system  
A distributed video frame store and real time processing system which includes a frame store subdivided into a number of sectors each with an associated arithmetic unit capable of parallel...
4321686 Correction processor of self-adaptive filters  
A self adaptive filter effects a distribution of the power density spectrum of two signals which are correlated in the filter adaptation process so that the filter can provide optimum adaption for...
4255791 Signal processing system  
An adaptive array signal processing system employs a correlation discriminant operator or signal recognizer. The operation of the signal recognizer is dependent upon noise decorrelation rather...
4254474 Information processing system using threshold passive modification  
An adaptive information processing system includes input terminals adapted to receive N input signals s1, s2, . . . sN representing an "input"; output terminals adapted to present n output...
4243959 Adaptive filter with tap coefficient leakage  
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...
4228517 Recursive filter  
A recursive filter characterized by increased efficiency and accuracy and incorporating a step decision circuit which reduces filter noise, error and size. Efficiency is obtained by reducing the...
4158232 Adaptive corrector  
An adaptive or self-adjusting corrector is provided for the correction or equalization of data signals formed with the primary value and a plurality of prior and subsequent oscillations. A...
4044241 Adaptive matched digital filter  
A real time digital filter with its transfer function being matched to a particular signal plus noise condition in a manner that causes the transfer function to adapt to changing signal plus noise...
4038536 Adaptive recursive least mean square error filter  
An adaptive recursive filter is disclosed which, in a preferred embodiment, comprises first and second adaptive transversal filters selectively coupled together to minimize the mean square error...
4038539 Adaptive pulse processing means and method  
A signal processing means and method of adaptively filtering input signals received at a terminal means in which the input signals include pulse signals and noise, with the pulse signals occurring...
4032762 Adjustable digital filter for high speed digital transmission  
An adjustable digital filter combines the functions of a conventional digital filter and a conventional equalizer and permits elimination of the additional delay stages conventionally required for...
4012627 Distribution-free filter  
Data generally representative of presumed noise in an environment are colted and compared with data from one or more statistically symmetric observations of a selected portion of that environment....
3967102 Self-adjusting digital notch filter  
Digital filter auto-adjustment to variations in input signals is achieved by normalizing the output of the second of two substantially identical series-connected digital filter stages and...
3932818 Spectrum notcher  
Disclosed is an adaptive filter for suppressing interfering narrow-band signals in a composite signal containing a desired broad-band signal. The adaptive filter is useful in a system which uses a...