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| Number | Title | Issue Date |
| 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 pulse-response of the equivalent echo channel into three interva... | 04/05/1988 |
| 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 image are applied to a separation filter which attenuates the c... | 01/05/1988 |
| 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 and, eventually, feedback coefficients b2 to bm of an analo... | 09/22/1987 |
| 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 42 is addressed by the output of one of the delay stages and... | 09/15/1987 |
| 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 during each cycle of the noise signal. The samples of each of... | 09/15/1987 |
| 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 discrete Doppler frequencies. A built-in test feature is i... | 09/15/1987 |
| 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 measurement by noise and A/D conversion, particularly at low... | 06/16/1987 |
| 4660163 | 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 has been found. The filter (FIG. 4, FIG. 5) has three parallel ... | 04/21/1987 |
| 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 reference input signal having a reference noise input portion and ... | 03/10/1987 |
| 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 plurality of variable weighting means for weighting signals from e... | 02/03/1987 |
| 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., oscillating, of the filter is overcome by adjusting the updat... | 05/27/1986 |
| 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 to track a sinusoidal interference frequency and to synthesi... | 05/13/1986 |
| 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 shaping means. The spectrum shaping means comprises matched or ... | 06/18/1985 |
| 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 register and a summing circuit with the delayed discrete v... | 03/26/1985 |
| 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 scaling the time axis of the impulse response described by... | 01/15/1985 |
| 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 distinguish whether any significant received far end energy is on... | 01/01/1985 |
| 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 of an echo path as a tap weight and receiving a received si... | 10/23/1984 |
| 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 into the tap coefficients which tends to drive them toward ... | 08/21/1984 |
| 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 adapted to a signal component of an input signal using a variabl... | 03/20/1984 |
| 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 adapted to a signal component of an input signal using a variabl... | 09/06/1983 |
| 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 -Hn+1 in response to input signal sam... | 03/22/1983 |
| 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, correlator the two channels are designated a first channel and... | 10/19/1982 |
| 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 iteratively by positive and negative correction steps, respectively,... | 09/14/1982 |
| 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 operation for processing data from all the sectors simultaneously.... | 07/13/1982 |
| 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 a wide range of input signals. The power density distribut... | 03/23/1982 |
| 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 than noise filtering, so that an unbiased, although sometimes ... | 03/10/1981 |
| 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 responses r1, R2 | 03/03/1981 |
| 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 coefficient signal, whose sign and magnitude indicate the appro... | 01/06/1981 |
| 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 requirement for bulk memory and the number of multipliers wh... | 10/14/1980 |
| 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 plurality of delay members are provided for delaying the data sign... | 06/12/1979 |
| 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 conditions. A transversal type of digital filter is disclo... | 08/23/1977 |
| 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 of the output data of the recursive filter based upon observ... | 07/26/1977 |
| 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 at unknown times and having unknown durations, which inclu... | 07/26/1977 |
| 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 the equalizer. Reduced complexity and expense are attained... | 06/28/1977 |
| 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. The data are ranked in order of magnitude and the rank or... | 03/15/1977 |
| 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 subtracting the normalized output of the second filter stage from i... | 06/29/1976 |
| 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 broad-band signal and signal processing apparatus to deriv... | 01/13/1976 |
