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6430295 Methods and apparatus for measuring signal level and delay at multiple sensors  
Methods and apparatus for automatic gain and time delay computations between multiple sensors. In exemplary embodiments, one sensor is treated as a reference sensor with respect to a measured...
6415247 System identification method and its recording device  
A system identification device is provided capable of performing a sequential updating process and preventing the quantity of operation from becoming too complex. The system identification device...
6404832 Filter device and method of acquiring filter coefficients  
A filter device includes a first section for receiving data of a desired cutoff frequency. A second section operates for deciding whether the desired cutoff frequency is in a predetermined low...
6396548 System and method for multimode operation of a digital filter with shared resources  
There is disclosed a digital filter cell capable of processing in a first mode a first signal having real data components only and processing in a second mode a second signal having real data...
6396872 Unknown system identification method by subband adaptive filters and device thereof  
At first, adaptive filters 601, 602, . . . , 60K are operated by the initial numbers of taps memorized in the memory circuit 25, secondly operated by the approximate number of taps calculated in...
6389440 Acoustic feedback correction  
In a video conference facility, an echo cancelling device is provided which comprises an adaptive finite impulse response filter operable to sample the input signal to a loudspeaker and to model,...
6381623 Method for adaptive filter adjustment in a QAM/CAP system  
The QAM/CAP (quadrature amplitude modulation, carrierless amplitude/phase modulation) receiver has an analog-to-digital converter, a digital level regulator, an adaptive reception filter pair, and...
6377611 Apparatus and method for a DSSS/CDMA receiver  
An MMSE linear detector is implemented using a variable step-size Griffiths' algorithm. The received signal is sampled and stored. The stored samples are multiplied with components of a spreading...
6377619 Filter structure and method  
Multiported register files are employed to implement the input delays necessary for finite impulse response (FIR) filter operation. A multiported register file is a memory, typically small, with...
6363112 Parallel processing decision feedback equalizer  
A parallel processing decision feedback equalizer is configured to receive a plurality of symbol blocks in parallel via a plurality of corresponding input branches. It is further configured to...
6349112 Adaptive equalizer compensating signal distortion on transmission path  
An adaptive equalizer includes an impulse response detecting section, a region specifying section, an adaptive control section and a delayed decision feedback sequence estimating section. The...
6337878 Adaptive equalizer with decision directed constant modulus algorithm  
An adaptive equalizer for use in blind equalization systems to compensate for transmission channel distortion and noise in a digital communication system quantizes the input signal samples to...
6314441 Robust method for providing tap leakage in adaptive equalizer systems  
A method is described for producing coefficient leakage in an adaptive filter/equalizer without the need for using an adder/subtractor for each coefficient. Specifically, a method is provided for...
6308192 Methods and apparatus for adaptive filters  
The present invention relates to improved adaptive filtering techniques and architectures. Preferably, this filtering is performed as part of the digital processing that occurs with a digital...
6307903 Low pass digital filter implemented in a modem of a television system  
A low pass digital filter using cascade polyphase recursive digital signal processing circuit. The filter in the receive direction may contain a re-sampling Hogenauer filter followed by an...
6301298 Adaptive equalizer with complex signal regeneration and method of operation  
An adaptive equalizer for use in a digital transmission receiver includes Q-channel regeneration. A equalization filter produces complex valued equalized signal samples representative of a digital...
6298362 Apparatus and method for equalizer filter units responsive to 5-level inputs signals  
In a transceiver unit in which the information is encoded in a plurality of levels, a update unit for an adaptive or equalizer filter unit includes apparatus (51-56) for forming product of error...
6286021 Apparatus and method for a reduced complexity tap leakage unit in a fast adaptive filter circuit  
In a fast adaptive filter unit, an update unit replaces the multiplier unit which generates a product of the filter constant, the error signal and data signal and adding this product to a...
6282661 Apparatus and method for adaptive reduction of power consumption in integrated circuits  
Power consumption in program implemented circuits and the like is dynamically controlled in accordance with the circuit performance over time, not by reducing switched capacitance as was done in...
6246783 Iterative filter framework for medical images  
Functional filter elements are linked in a multi-pass filter framework that forms part of an MRI system. The filter framework is configured by a set of parameters selected by the operator to...
6240434 Finite impulse response circuit and disk unit  
A finite impulse response circuit includes a delay line having a plurality of taps, receiving an input signal, a multiplying part for multiplying coefficients to signals obtained from the taps and...
6226049 NTSC rejection filter  
A receiver including an NTSC rejection filter for eliminating interference signals from a high definition signal. The ratio of the energy of an expected high definition signal to the energy of an...
6222592 TV receiver equalizer storing channel characterizations for each TV channel between times of reception therefrom  
An adaptive channel equalizer for a digital television receiver includes memory for storing channel characterization information for each received channel, from each time the channel is tuned to...
6223194 Adaptive filter, step size control method thereof, and record medium therefor  
An adaptive filter which is realized as an FIR filter employing stochastic gradient algorithm comprises a step size controller for controlling step size αc(n) so as to minimize the mean squared...
6216148 Adaptive analog equalizer for partial response channels  
A single analog filter structure within a partial response channel combines an antialias low pass filter and a time domain waveform shaping equalizer upstream of a digital sampler. The filter also...
6209014 Look-ahead LMS technique  
An apparatus and a technique for adapting a plurality of tap weights in an adaptive filter where tap weights are adapted utilizing every other sample of a sequence of samples. The apparatus...
6208687 Filter switching method  
A filter apparatus (1) has a digital FIR filter (8) divided into two or more sections (6, 12) with means (18, 20, 22, 24, 26, 40) for varying the filter function of each section (6, 12). The...
6202075 Second order LMS tap update algorithm with high tracking capability  
The system and method of the present invention, according to one embodiment, employs an adaptive finite impulse response filter having a second order Least Mean Square (LMS) architecture. The...
6154547 Adaptive noise reduction filter with continuously variable sliding bandwidth  
An infinite impulse response (IIR) lowpass filter is placed in the audio path of an audio system wherein the upper cutoff frequency of the filter is adaptively controlled based on a comparison...
6151614 Adaptive filter and adapting method thereof  
An object of this invention is to provide an adaptive filter capable of reducing a convergence time and residual error even when there exists an interval having a small input signal power for a...
6108681 System for sharing resources in a digital filter  
A digital filter has a filter cell for generating processed data. The digital filter cell includes plurality of coefficient registers which are arranged to circulate a plurality of coefficient...
6094637 Fast MPEG audio subband decoding using a multimedia processor  
A decoding process for a MPEG1 audio subband uses the symmetry of filter coefficients to reduce the number of multiplications required to decode an audio subband. The decoding process can be...
6064809 Fast model predictive ellipsoid control process  
A model predictive control process which approximates a constraint set as an ellipsoid to directly address actuator limitations, to provide a robust controller structure, and reduce computation...
6061444 Echo canceler and method for learning for the same  
The present invention relates to an echo canceler for training an echo path estimation without providing a hindrance to a speech. The echo canceler of the present invention includes a pseudo noise...
6055318 Adaptive noise reduction filter with low modulation disabling  
An infinite impulse response (IIR) lowpass filter is placed in the audio path of an audio system wherein the upper cutoff frequency of the filter is adaptively controlled based on a comparison...
6052702 Decision feedback filter device in the frequency domain  
A decision feedback filter device which has a forward filter (FF) and a feedback filter (FB) for the production, from input symbols (x(n)), of the corresponding decisions (d(n)), the forward...
6035312 Adaptive filter  
An adaptive filter includes n (n is a positive integer) blocks, m filter circuits, a matrix switch, an adder, and a controller. The blocks divide a continuous string of a plurality of input...
6028895 Distortion corrector for two data flows  
PCT No. PCT/EP95/04472 Sec. 371 Date Nov. 25, 1997 Sec. 102(e) Date Nov. 25, 1997 PCT Filed Nov. 14, 1997 PCT Pub. No. WO96/16495 PCT Pub. Date May 30, 1996A system for equalizing an input signal...
6026419 Single tone signal detector  
A signal detector for detecting a narrow-band signal of a desired frequency, using an adaptive type FIR filter having two filter coefficients, is disclosed. Using this filter, the input signal of...
6009448 Pipelined parallel-serial architecture for a modified least mean square adaptive filter  
A modified least mean squares adaptive filter method and apparatus is disclosed. The filter coefficients used to perform the FIR multiplications in a least mean squares adaptive filter are time...
6004022 Product sum operation apparatus  
A product sum operation apparatus in which an increase in the circuit scale of the product sum operation apparatus can be suppressed and the operation speed can be increased even when the number...
5999956 Separation system for non-stationary sources  
A source separation system (10) processes input signals formed by mixtures of primary signals originating from sources and estimates the primary signals so that the estimates do not differ even in...
5995542 Filter circuit arrangement having a plurality of cascaded FIR filters  
The filter circuit arrangement provides the properties of an FIR filter of length N, with K (K≥2) cascaded FIR-filter members. One FIR-filter member (5.K) is formed as an equalizer filter of...
5987485 Adaptive digital filter  
In adaptive digital filtering, first steps of adapting a filter coefficient dependent on a received data sample, and second steps of filtering by applying an adapted filter coefficient to a...
5983254 Zero-latency pipeline architecture for digital filters  
In a digital filter, data is received through an input path, and data in the filter is transported to an output through an output path. At least one delay element is disposed on the input path,...
5978824 Noise canceler  
A noise canceler of the present invention includes a signal-to-noise power ratio estimator to which a main signal and a reference signal are input. The estimator 10 estimates the sinal-to-noise...
5978489 Multi-actuator system for active sound and vibration cancellation  
A multi-actuator system for active sound and vibration cancellation utilizes an LMS type algorithm having an adaptive filter. However, the error signal rather than the input is filtered through an...
5978417 Adaptive cable equalizer  
An adaptive cable equalizer is provided with a simple architecture, wherein a single control structure: controls the adaptation of the filter for compensating for cable length while simultaneously...
5974434 Method and apparatus for automatically tuning the parameters of a feedback control system  
A new technique for adjusting the parameters of a feedback controller. A linear feedback controller includes proportional, integral and derivative (PID) controllers but is not limited to them. The...
5963594 Vector tracking filter  
A new filter that may be employed in timing recovery circuits, and automatic gain control circuits, employs a so-called vector tracking filter (VTF). The VTF includes a complex filter with a time...