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5216629 
Adjusting filter coefficients
The weighting coefficients in the coefficient array (3) of a transversal filter (1) are corrected in accordance with the least mean squares algorithm by adding to each coefficient a correction... 

5209237 
Method and apparatus for detecting a signal from a noisy environment and fetal heartbeat obtaining method
To provide an accurate reproduction of a signal detected in a noisy environment, a primary signal sensor and a plurality of "signalfree" reference sensors are used. Information collected from the... 

RE34205 
Adaptive recognizing device
An electronic adaptive recognizing device which includes an input store having a number of storage locations for receiving an input signal, and a number of addressable stores each having one or... 

5192918 
Interference canceller using tapweight adaptive filter
An interference canceller comprises a first input terminal (10) to which a combined signal and noise is supplied, and a second input terminal (12) to which a reference signal correlated with the... 

5175745 
Transversal type automatic equalizer with tap coefficient protection
A system of the transversal type automatic equalizer with a tap coefficient protection in which an intersymbol interference is prevented. The system includes a summing unit for summing all of the... 

5168459 
Adaptive filter using continuous crosscorrelation
Coefficients of an adaptive filter are updated continuously during the filter's normal operation. This is achieved by superimposing on the filter input signal a known noise signal. At the filter's... 

5148488 
Method and filter for enhancing a noisy speech signal
A filter for filtering a speech signal to reduce acoustic noise is disclosed. In accordance with the inventive filter, the parameters of an allpole vocal tract model are first estimated from the... 

5146494 
Overlapping lookupandadd echo canceller requiring a smaller memory size
An echo canceller which incorporates an overlapping lookupandadd structure is suitable for cancelling both the linear and nonlinear components of an echo. In the wellknown overlapping... 

5142552 
Method and apparatus for analog D.C. offset cancellation
The present invention utilizes a decision feedback equalizer (DFE)/finite impulse response filter. A plurality of taps of the equalizer supply coefficients to the input function and are updated in... 

5136531 
Method and apparatus for detecting a wideband tone
A method of detecting a wideband tone, having a nominal frequency but occurring anywhere within a wide range of frequencies, includes a step of bandpass filtering input data. The bandpassfiltered... 

5130943 
Method and configuration for improving the dynamic range of an adaptive recursive network for processing discretetime signals
In a method and configuration for improving the dynamic range of an adaptive recursive network for processing discretetime signals, gradient signals are formed from output signals of the network... 

5119918 
Electromagnetic clutch with permanent magnet brake
Energization of an electric coil produces flux for attracting an armature of a clutch into engagement with a rotor in order to couple an input shaft to an output pulley. When the coil is... 

5111418 
Method and network configuration for obtaining the gradient of the output signals of a given network for processing discretetime signals relating to the network parameters
A method and network configuration obtain a gradient of output signals of a network for processing discretetime signals with respect to network parameters. The network includes a first subnetwork... 

5105377 
Digital virtual earth active cancellation system
A digital virtual earth active cancellation system which receives a phenomena input signal representing residual phenomena to be cancelled and has an adaptive filter which generates a cancellation... 

H001005 
GramSchmidt spacetime adaptive filter using transverse orthonormal ladder filters
A spacetime adaptive filter system is provided for eliminating unwanted signals from a radar or communication system. The filter system receives a main channel and several auxiliary channels... 

5068875 
Adaptive loop gain phase filter
The adaptive loop gain phase filter of the invention utilizes an averaged value of the phase error at each baud time instead of the phase error for generating the value of the frequency shift.... 

5058047 
System and method for providing digital filter coefficients
There is disclosed a system and method for generating coefficients for use in a digital filter. The coefficients are generated utilizing an iterative adaptive process employing a least mean square... 

5051942 
Method and apparatus for calculating filter factors
A transfer function is determined in accordance with an amplitude characteristic and a phase characteristic. The transfer function is subjected to inverse Fourier transform. An imaginary part of a... 

5050119 
Optimized sparse transversal filter
A transversal filter has more delay elements than adjustable multipliers, and a switching arrangement for supplying each multiplier with the signal from a selected one of a group of the elements.... 

5029118 
Periodic noise canceling system and method
A system and method for canceling a periodic noise superposed on a real signal component of an original signal. The system comprises: a synchronous adaptive noise canceling filter which... 

5025406 
Adaptive digital filter for multi path distortion cancellation
Apparatus in a receiver for adaptively adjusting the receiver response to changing signal conditions includes a shift register for serially loading signal and having parallel output taps for... 

5014232 
Adaptive digital filter having nonrecursive and recursive filter elements
An adaptive digital filter including a nonrecursive 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... 

5007007 
Circuitry for converting a measurement signal disturbed by a disturbance function into an undisturbed signal
Circuitry is disclosed for converting an input measurement signal VR(i), which is disturbed at least occasionally by a disturbance function, into an output, undisturbed signal VR(o) by means of a... 

5001661 
Data processor with combined adaptive LMS and general multiplication functions
A data processing system uses the same structure and hardware to implement either a general purpose multiplier or arithmetic operations associated with the leastmeansquares (LMS) algorithm.... 

4989170 
Hybrid stochastic gradient for convergence of adaptive filter
The present invention provides a technique for updating the coefficients a(n) of an adaptive filter impulse response A(n), where A'(n)=(ao (n) al (n) . . . am (n))is the adaptive filter impulse... 

4947363 
Pipelined processor for implementing the leastmeansquares algorithm
A filter processor implements the least mean squares (LMS) algorithm in an N tap digital filter in (N+1) time cycles, where N is an integer. A filter structure is shown which is implemented with a... 

4947362 
Digital filter employing parallel processing
An adaptive digital filter can be implemented on a single Very Large Scale Integrated (VLSI) circuit silicon chip and the Least Mean Square adaptive filter algorithm can be performed by parallel... 

4941191 
Image analysis system employing filter lookup tables
An image processing system and filters applicable to such a system wherein digitized discrete signals, as pixel signals, are processed in a lookup table according to the sum of the current... 

4939685 
Normalized frequency domain LMS adaptive filter
A normalized frequency domain Least Means Square filter. The feedback coefficient for each frequency bin is adjusted separately in the filter by use of an input power estimate. The power estimate... 

4933891 
Method and circuit configuration for generating filter coefficients
Coefficient signals are generated for a transverse filter which receives data signals assuming W different amplitude values as input signals, with N successive input signals being stored in a... 

4928258 
Recursive median filtering
This technique involves digitally filtering data by determining the median of data values instead of mean or some other algebraic combination. It is unique in that the data used for the median... 

4922530 
Adaptive filter with coefficient averaging and method
An adaptive transversal filter is characterized by a first adaptive filter for generating a plurality of estimated impulse response coefficients representing an impulse response of a transmission... 

4918742 
Image processing using multipass convolution with small kernels
Method and apparatus for image processing in which an image array is convolved with a kernel. The convolution is carried out with a decomposed form of the kernel that is a linear combination of... 

4914639 
Sonar doppler system with a digital adaptive filter
A doppler sonar speed measuring system incorporating a digital adaptive filter responsive to the difference in newly received raw speed data and previously received speed data to determine the... 

4887306 
Adaptive temporal filter for ultrasound imaging system
An improved temporal compounding technique for a medical ultrasound imaging system. The imaging system produces a plurality of pixel signals, such that each pixel signal comprises a time series of... 

4885787 
Highspeed digital image processing apparatus
An image processing apparatus is provided which is capable of real time image processing, especially filtering, without generating a delay in a frame memory. A cascade filtering circuit filters... 

4882754 
Data compression system and method with buffer control
In a digital encoder, truncation is controlled by the fullness of the output ratesmoothing buffer. A signal compression system is shown for processing a stream of fixed length digital sample... 

4868775 
Adaptive digital filter
In an adaptive digital filter, the inputs to the variablecoefficient scalers of an adaptive digital filter are mutually orthogonal and their mean square values are equal. As a result, the rate of... 

4856031 
Adaptive multiharmonic phase jitter compensation
A multiharmonic adaptive phase jitter compensator for a high speed modem is provided. The compensator includes an IIR filter for each harmonic of phase jitter for which compensation is desired.... 

4852036 
Adaptive digital filter and an echo canceler incorporating the same
In an adaptive digital filter, the inputs to the variablecoefficient scalers of an adaptive digital filter are mutually orthogonal and their mean square values are equal. As a result, the rate of... 

4841828 
Electronic musical instrument with digital filter
A pitch synchronizing signal snychronized with the pitch of a digital tone signal to be filtered is generated by a pitch synchronizing signal generation circuit. A digital filter circuit which... 

4843583 
Nonlinear adaptive filter
A nonlinear adaptive filter has an input and an output, and includes an adjustable linear filter and nonlinear filter connected serially between the input and output. The parameters for the... 

4835724 
Apparatus and method of quantizing a set of weights for a weighted sun signal processing system
A conversion apparatus for quantizing an initial set of weights for a weighted sum signal processing system having one or more conversion arrays. Each conversion array stores a plurality of values... 

4833634 
Multipurpose adaptive filter
This rate dependent filter has a twoportion continuous filter function which optimizes noise filtering and minimizes detrimental lag or degradation characteristics. A first portion of the filter... 

4829463 
Programmed timechanging coefficient digital filter
A timechanging coefficient digital filter having a data RAM for storing input data, a purality of N data registers at the output of the data RAM forming a delay element, a coefficient RAM storing... 

4827443 
Corrective digital filter providing subdivision of a signal into several components of different frequency ranges
A wave digital filter has one input set to zero and a signal to be distortioncompensated or simply to be subdivided into signals occupying different frequency ranges is supplied at the other... 

4811261 
Adaptive digital filter for determining a transfer equation of an unknown system
An adaptive digital filter for identifying a transfer function of a unknown system is employed, for example, for echo cancellation and howling prevention. The transfer function of the adaptive... 

4807173 
Frequencydomain blockadaptive digital filter
A frequencydomain blockadaptive digital filter (FDAF) having a finite impulse response of length N for filtering a timedomain input signal in accordance with the overlapsave method includes... 

4803648 
Echo canceller using an adaptive finite impulse response filter
An echo canceller, using an Adaptive Finite Input Response Filter (AFIR), uses a processing device with a plurality of interconnected cells. These cells, connected in a systolic arrangement,... 

4802222 
Data compression system and method for audio signals
Audio signals such as ECG, speech and music are digitally processed to reduce the bitrate needed for accurate transmission, known as minimizing the entropy of the signal. The transmitter features... 