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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 2m1


4792915 
Non linear adaptive filters
A nonlinear adaptive filter is described having a linear filter connected in parallel with a nonlinear 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 timevarying characteristics
The method provides the use, for the determination of the estimation echochannel pulse response, of digital filtering techniques of the transversal adaptive type, and the subdivision of the... 

4717951 
Adaptive digital filter
A pictureinpicture television receiver for which the viewer may change the size of the inset image includes an adaptive antialiasing 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, faulttolerant narrowband filterbank
An adaptive, failsoft digital filterbank for digitized Dopplermodulated 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 
Twoinput crosstalkresistant adaptive noise canceller
A twoinput crosstalkresistant 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 noncoherent interferring signals
Suppression of coherent and noncoherent 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 phaselocked 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 sharedtime processing of digital signals and application to a multiplexed selfadapting echo canceler
A selfadapting digital filter having one or more processing modules each possessing a delayed discrete value memory, a coefficient memory, two multipliersaccumulators, a variableamplitude 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 pseudoecho 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 socalled 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 twochannel, or pairwise,... 

4349889 
Nonrecursive filter having adjustable stepsize for each iteration
Arrangement having a nonrecursive 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 selfadaptive 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 selfadjusting 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 
Distributionfree 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 
Selfadjusting digital notch filter
Digital filter autoadjustment to variations in input signals is achieved by normalizing the output of the second of two substantially identical seriesconnected digital filter stages and... 

3932818 
Spectrum notcher
Disclosed is an adaptive filter for suppressing interfering narrowband signals in a composite signal containing a desired broadband signal. The adaptive filter is useful in a system which uses a... 