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Pulse Or Digital Communications > Equalizers > Automatic > Adaptive AdaptiveAdaptive patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.11/15/07 - 20070263714 - Determination of filter weights For a given channel and a filter having at least one filter tap, a set of at least one weight value is determined for the at least one filter tap according to which at least one weight value substantially minimizes a gradient of a frequency response for the given channel ... 11/08/07 - 20070258515 - Method of reducing a number of computations in an equalization process and apparatus for performing the same A method of reducing a number of computations in an equalization process includes performing a pre-equalization operation on selected first frames from a plurality of frames, and estimating pre-equalization values of second frames based on the pre-equalization values of selected first frames, the second frames being frames which are not ... 10/18/07 - 20070242739 - Multi-pair gigabit ethernet transceiver having a single-state decision feedback equalizer Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components induced by characteristics of a transmitter's partial response pulse shaping filter in a demodulator, ... 10/04/07 - 20070230556 - Signal processing apparatus, signal processing method, and sound field correction system A signal processing apparatus includes at least one equalization section, each of the equalization section being capable of setting a center frequency, a gain value at the center frequency, and a Q value and allowing set frequency-amplitude characteristics to be applied to an input signal; and a computation section. The ... 10/04/07 - 20070230554 - Effective adaptive filtering techniques A noise level of an input signal is determined by a noise calculation module. based on the noise level, a boundary setting module sets a reduced constellation boundary interval. This reduced constellation boundary interval is employed by an equalizer to perform adaptive equalization of the input signal. ... 09/27/07 - 20070223570 - Distortion compensating equalizer A reception-signal adjusting unit adjusts a waveform of a digital reception signal so that amplitude is equally distributed on a positive side and a negative side. A digital filter unit adds a predetermined delay to an input signal by delay elements serially connected as many as taps, multiplies a delay-added ... 09/20/07 - 20070217497 - Fir filter A necessary number of initial stage element circuits, intermediate stage element circuits, and final stage element circuits are connected in cascade and combined in parallel arrangement simultaneously. The partial sum output data on the element circuits is synchronized with the inner partial sum data. In this way, it is possible ... 08/23/07 - 20070195873 - Equalizer containing a plurality of interference correcting equalizer sections An equalizer includes at least two first mutually interfering equalizer sections, and at least two second interference-correcting equalizer sections, arranged in series. Each of the second equalizer sections corresponds with one first equalizer section, such that although each corresponding equalizer has the same center frequency, the second equalizer sections have ... 08/16/07 - 20070189375 - Infinite impulse response filter circuit and magnetic disk drive where l and ki (i=0, 1, 2 , , , ) are real numbers. ... // - 1 - ... // - 2 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 1 - ... // - 2 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 2 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 2 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 2 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 2 - ... // - 1 - ... // - 2 - ... // - 1 - ... 08/16/07 - 20070189374 - Concurrent process for blind deconvolution of digital signals A process and system for eliminating intersymbol interference in digital signals, which is caused by the dispersive effect of any practical transmission channel. ... 08/16/07 - 20070189373 - Method and apparatus for generating equalizer filter tap coefficients A method and apparatus generating an error signal and an update vector signal used to generate filter tap coefficients for an equalizer filter residing in an equalizer. The equalizer filter outputs an equalized signal in response to receiving a sample data stream. The error signal is generated by down-sampling the ... 07/26/07 - 20070171966 - Passive tap and associated system for tapping network data A network tap device array including one or more passive full-duplex bidirectional ZPL network tap devices is disclosed. The array enables data from multiple nodes in a communications network to be tapped and forwarded to a plurality of monitoring devices. In one embodiment the network tap device array includes a ... 07/26/07 - 20070171965 - Method and apparatus for equalization An exemplary embodiment of an adaptive equalizer is provided, receiving symbols to generate an equalizer output. The adaptive equalizer comprises a plurality of tap cells, a coefficient updater, a plurality of multiplexers, a controller and an integrator. Each tap cell generates a filter value from a tap data value and ... 07/12/07 - 20070160125 - Adaptive filter having shared structure An adaptive filter may include a unitary filter, a combiner, and an error estimator. The unitary filter may include a feedback portion to generate a feedback output and a feed forward portion to generate a feed forward output. The combiner may combine the feedback output and the feed forward output ... 07/05/07 - 20070153889 - Application of leakage to an adaptive equalizer Digital signal processing apparatus and methods for modifying frequency response of a signal is described herein. In one aspect, the invention relates to an improved method for stabilizing the LMS adaptation of an FIR filter. In another aspect, the invention relates to a digital equalizer with tap weights that are ... 06/28/07 - 20070147491 - Transmitter equalization According to embodiments of the subject matter disclosed in this application, transmit equalization, systematic jitter correction, and jitter injection may be achieved through a lookup table transmitter equalizer. The equalizer may be a multiple-way interleaving equalizer, with each interleaved section having its own lookup table. Entries in each lookup table ... 06/28/07 - 20070147490 - Filter coefficient adjusting circuit A filter coefficient adjusting circuit of the present invention comprises a coefficient adjusting circuit (2) that adjusts an equalization coefficient by weighting an initial value of the equalization coefficient on the left side from a center tap of a FIR filter (1) that equalizes a reproduce signal, by a factor ... 06/14/07 - 20070133670 - Parallel equalizer for ds-cdma uwb system and method thereof A parallel equalizer for a DS-CDMA UWB system and method thereof are provided. The parallel equalizer includes: a filter block for filtering a training input signal in a ‘training mode’, and filtering the plurality of input signals in parallel in a ‘symbol decision mode’; a symbol decision block for obtaining ... 05/31/07 - 20070121717 - Segmented equalizer In one embodiment of the present invention, a segmented equalizer includes a plurality of feedforward equalizer segments, each feedforward equalizer segment responsive to delayed samples of an input signal {vn}, wherein n is the index of samples, and including a filter block for filtering the delayed samples by using coefficients ... 05/17/07 - 20070110148 - Search engine for a receive equalizer A search engine selects initial coefficients for a receive equalizer. The search engine may be incorporated into a communication receiver that includes a decision feedback equalizer and clock and data recovery circuit. Here, the search engine may initialize various adaptation loops that may control the operation of, for example, a ... 05/10/07 - 20070104263 - Method for adaptively tuning an equalizer A method for adaptively tuning an equalizer is disclosed. The method includes utilizing the equalizer to process an input signal and accordingly generate an output signal, determining whether the equalizer has converged, and adjusting an equalizer step size of the equalizer according to a result of the step of determining ... 05/03/07 - 20070098061 - Apparatus, system, and method for adaptive asynchronous equalization using leakage An apparatus, system, and method are disclosed for adaptive asynchronous equalization using leakage. An equalizer sums products of a plurality of tap signals from a delay line sampling a read signal and a plurality of corresponding tap coefficients to form an equalized signal in an asynchronous time domain having a ... 04/12/07 - 20070081584 - Adaptive filter The present invention relates to a filter apparatus and method having a fixed aspect for providing a predetermined selectivity and having an adaptive aspect for determining the frequency response of said filter apparatus. The adaptive aspect is controlled to change the frequency response. Predetermined zero values of the filter characteristic ... 03/22/07 - 20070064787 - Adaptive equalization method and circuit for continuous run-time adaptation In some embodiments disclosed herein, equalizers in a receiver are adapted during normal operation, as they extract bit data from a received bit stream, to account for channel and/or circuit fluctuations. ... 03/08/07 - 20070053420 - Method, apparatus, and program for designing digital filters For example, more than one FIR-type basic filters having a symmetric sequence of numbers having a predetermined characteristic as filter coefficient are combined and connected in cascade connection. The filter coefficients are calculated and for the y-bits data of the calculated filter coefficients, the lower bits are cut off for ... 03/08/07 - 20070053419 - Adaptive analog equalizer and digital signal receiver having the same Provided are an adaptive analog equalizer and a digital signal receiver having the same. The adaptive analog equalizer includes selective comparing means for comparing the data equalized by the equalizing means to an internal reference value set based on the equalized data to output an error signal e(n); sign inverting ... 02/22/07 - 20070041439 - Filtering method and an apparatus The invention relates to a method for filtering. In the method an adaptive filtering is performed to an input signal. The filtered signal is further interpolated. The input signal is also interpolated for adapting the adaptive filtering. In the method the properties of the interpolation of the filtered signal are ... 02/22/07 - 20070041438 - Sampling rate conversion device and method, and audio device A sampling rate converter able to obtain an amplitude characteristic that passes any frequency and able to achieve a high precision conversion without depending upon a cutoff frequency, having an up sampler 103 for inserting (U−1) zero points between signals and raising a sampling frequency Fsi U-fold, a convolution processing ... 02/15/07 - 20070036211 - Signal processing device and method, and signal decoding device and method Disclosed is a signal processing apparatus for implementing a quadratic term of a second-order Volterra filter. This signal processing apparatus (1) includes a plural number of multipliers each adapted for multiplying first and second signals. Each multiplier includes one or more series-connected delay circuits, each delaying a signal output from ... 01/25/07 - 20070019720 - Method and system for filter loop with saturation Methods and systems for processing a signal are disclosed herein and may comprise filtering an input signal and a plurality of saturation limit signals to generate a plurality of filtered input signals. A plurality of summed current input signals may be generated by adding the plurality of filtered input signals ... 01/18/07 - 20070014345 - Low complexity tomlinson-harashima precoders A method to design low complexity pipelined Tomlinson-Harashima precoders and its associated circuit architectures have been described. The low complexity pipelined TH precoder design relies on the proposed low complexity precomputation based FIR filters. In the low complexity precomputation method for FIR filters, each multiplier is replaced with a multiplexer. ... 12/28/06 - 20060291551 - Adaptive equalizer Some embodiments of the invention include apparatus, systems, and methods to adjust a clock generator and an equalizer to reduce jitter in an output signal. A phase detector provides feedback information on a first feedback loop and a second feedback loop. A clock adjustment circuit uses the feedback information on ... 11/16/06 - 20060256849 - Adaptive blind start-up receiver architecture with fractional baud rate sampling for full-duplex multi-level pam systems This invention presents a novel receiver architecture for full-duplex multi-level PAM systems. The receiver employs an Analog-to-Digital Converter (ADC) that has a sample rate flexibly specified as (Ns+1)/Ns baud rate where Ns is an integer equal or greater than 1. A fractional-spaced echo canceller is used to cancel the echo ... 10/26/06 - 20060239340 - Measurement of equalizer span alignment with respect to channel condition The span of a linear transversal equalizer filter moves according to the current positions of the multi-paths to a receiver. The alignment of the filter span is measured quantitatively with respect to the current positions of the multi-paths. Adjustments are made to the filter span to enable the linear transversal ... 10/26/06 - 20060239339 - Cir estimating decision feedback equalizer with phase tracker An output of an equalizer is decoded to produce first decoded data having a first accuracy. The output of the equalizer is further decoded to produce second decoded data having a second accuracy, and the second accuracy is greater than the first accuracy. Tap weights for the equalizer are calculated ... 10/19/06 - 20060233230 - Equalization apparatus and equalization method An equalization apparatus and equalization method capable of reducing power consumption and minimizing degradation in reception performance even when changes occur in the reception environment. Channel response estimator 101 estimates a channel response from a reference signal and a received signal and outputs the result to control circuit 102. In ... 10/19/06 - 20060233229 - Reconfigurable communications circuit A communications circuit can operate in a first mode, such as a diversity mode including space time transmit diversity (STTD). In this mode, a number of equalizer filter portions connected to a number of post-equalizer processors are employed. When the diversity mode is not required, the extra equalizer filter portions ... 09/28/06 - 20060215747 - Channel estimation enhanced lms equalizer The present invention is related to an enhanced equalizer using channel estimation. A scaled version of a channel estimate is used as an expected average behavior of the product of a transmitted signal and a received signal to implement Griffith algorithm. The present invention also uses advance or prediction of ... 09/28/06 - 20060215746 - Low latency digital filter and method may be calculated as a result of a single further multiply and accumulate operation, upon arrival of the symbol S(n). This, significantly reduces the latency of the filter. ... // - 1 - ... 09/21/06 - 20060209946 - Methods and devices for shortening the convergence time of blind, adaptive equalizers The convergence time of a blind, adaptive equalizer is shortened by using a tracking generator. The tracking generator comprises a smoothing filter which receives and smoothes a tap coefficient error estimate derived from an output data stream. Thereafter, a fraction of the smoothed estimate is generated. It is the use ... 09/21/06 - 20060209945 - Data receiver and equalizer adapter A data receiver includes: a plurality of reception circuits each of which receives a data signal through a transmission line, and includes an equalizer having a function of performing waveform shaping of the data signal; and an equalizer adapter which is arranged in correspondence with all or every predetermined number ... 09/14/06 - 20060203899 - Method of equalising a channel and apparatus therefor In the field of optical communications, a number of techniques are known for channel equalisation. However, these techniques are, for various different technical and/or economic reasons, unsuitable for application in relation to optical communications at a data rate of 10 Gbps. Consequently, the present invention provides a dithered linear search ... 09/07/06 - 20060198435 - Digital filter To provide a digital filter that is small in its circuit scale and can suppress a consumed electric power to a low level. A multiplier 1, a first adder 2 and a second adder 3 perform a filtering calculation to data inputted to a digital filter 10. A first output ... 09/07/06 - 20060198434 - Equalizer training method using re-encoded bits and known training sequences The present invention provides a multi-branch equalizer processing module operable to cancel interference associated with received radio frequency (RF) burst(s). This multi-branch equalizer processing module includes both a first equalizer processing branch and a second equalizer processing branch. The first equalizer processing branch is operable to be trained based upon ... 08/10/06 - 20060176947 - Apparatus and method for setting tap coefficient of adaptive equalizer There is provided an apparatus and method for initializing a tap coefficient of an adaptive equalizer constituting a read path for a storage medium, where the apparatus includes an FIR filter, a Viterbi decoder, a level error detector, and a tap coefficient updater, the FIR filter receives a first signal ... 08/10/06 - 20060176946 - Adaptive equalizer circuit An adaptive equalizer circuit equipped by a control unit for controlling an equalizer circuit, comprising a detection unit for detecting an identity of a preset data pattern with a data pattern as a result of data judgment for an output of the equalizer circuit, a monitor unit for sequentially monitoring ... 08/10/06 - 20060176945 - Decoding device and decoding method A decoding apparatus that is capable of calculating of the likelihood information at high speed while suppressing increases in processing amount and in circuit scale. In this apparatus, in computations of the backward probability in a backward probability computing section (112), while one processing system calculates the backward probability βk ... 08/03/06 - 20060171451 - Adaptive equalizer with a dual-mode active taps mask generator and a pilot reference signal amplitude control unit An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch ... 06/29/06 - 20060140263 - Equalizers and methods for equalizing Equalizers and methods of equalizing, wherein an equalizer may include includes n (where n is an integer ≧) biquad circuits each include an input node, a biquad band pass node and a biquad low pass node, a first summing circuit summing an output of the biquad band pass node of ... 06/29/06 - 20060140262 - Low voltage multistage adaptive equalizer The present invention is related to an adaptive equalizer comprising multiple tuning circuits that generate tuning signals. Each tuning signal can typically induce higher frequency gain up to a limited level, e.g. +5 dB, at the upper data frequency for compensation of high frequency losses in the connected transmission channel. ... 06/22/06 - 20060133471 - Coefficient update circuit, adaptive equalizer including the coefficient update circuit, and coefficient update method of the adaptive equalizer A coefficient update circuit, an adaptive equalizer including the coefficient update circuit, and a coefficient update method of the adaptive equalizer are provided. The coefficient circuit includes: an error level detector, which detects the level of an error signal that is a difference between the level of an output signal ... 06/22/06 - 20060133470 - Method and system of nonlinear signal processing A nonlinear equalizer for treating the nonlinear component of a distorted digital signal includes a first processing unit adapted to receive the distorted digital signal and yield an appropriate output signal in response thereto, a second processing unit adapted to receive the distorted digital signal and yield an appropriate output ... 06/01/06 - 20060114982 - Adaptive equalizer and related method thereof An adaptive equalizer and the related method are disclosed. The adaptive equalizer is capable of adjusting its own equalization coefficients, and includes a reference signal generator for generating a reference signal according to a first reference source, an equalization unit for generating an equalized signal by processing a received signal ... 06/01/06 - 20060114981 - Joint channel and noise variance estimation in a wideband ofdm system A method and system for use in a wireless-local-area network (WLAN), for simultaneously estimating the unknown multi-path channel and noise characteristics and using the channel and noise estimates to improve system performance in the presence of narrowband interferers. Estimates are made for the unknown multi-path channel and noise characteristic without ... 05/25/06 - 20060109897 - Fft accelerated iterative mimo equalizer receiver architecture A receiver, such as a CDMA MIMO receiver, includes a LMMSE-based chip-level equalizer constructed so as to implement a FFT accelerated iterative algorithm having a complexity of order O(Nlog2(N)), where N is the dimension of a covariance matrix. The equalizer uses one of an overlap-save or an over-lap add FFT ... 05/11/06 - 20060098727 - Adaptive equalizer The present invention is related to an adaptive equalizer comprising: an equalizer filter (32) for filtering a distorted signal from a communication channel, having a data input (30) for receiving said distorted signal, a feedback signal input for a feedback control signal, and which generates an output signal at an ... 04/27/06 - 20060088089 - Adaptive equalizer with dual loop adaptation mechanism An adaptive equalizer may use dual loop adaptation to improve the performance of the equalizer. The first feedback loop may generate a boost control signal, based on the signal input to and output from a slicer. A second feedback loop may correct the swing amplitude of the slicer, so that ... 04/27/06 - 20060088088 - Look-ahead equalizer and method for determining output of look-ahead equalizer A look-ahead equalizer is provided. The equalizer has an equalizer without a first tap, a look-ahead unit, and a slicer unit. The equalizer without a first tap outputs a pre-filter output and a state reference signal. The look-ahead unit is coupled to the output of the equalizer without a first ... 04/20/06 - 20060083297 - Filters for communication systems The invention relates to a cascaded scheme in which an RRC filter, a modified RRC filter or other digital filter is implemented at a relatively low data rate, such as twice the symbol or chip rate, or 2×. Interpolation filters are used to increase the data rate to a higher ... 04/20/06 - 20060083296 - Method and apparatus for generating coefficients in continuous time equalizers Systems and methods are disclosed to adaptively generate coefficients for continuous time least mean square error equalizers and to correct offset in high-gain amplifiers. An adaptive coefficient generator includes a bank of individual coefficient generators, each utilizing a first adaptive correction signal for a first correction and a second adaptive ... 03/30/06 - 20060067398 - Adaptive delay base loss equalization A method, system and apparatus to self-determine equalization parameters for a channel. An initiator sends an equalization insensitive signal (EIS) to a responder on channel to be equalized and begins a count. A responder responds with an EIS. When the initiator receives the response EIS the count is terminated. The ... 03/30/06 - 20060067397 - Receiver for performing adaptive equalization and method A receiver includes a filter capable of receiving an input signal and generating an output signal. The filter provides a transfer function. The filter includes a first stage capable of adjusting a pole and a first zero of the transfer function. The filter also includes a second stage capable of ... 03/30/06 - 20060067396 - Feed forward equalizer for a communication system Method and apparatus for a feed forward equalizer for a communication system are described. ... 03/30/06 - 20060067395 - Iterative forward-backward parameter estimation A method and apparatus for jointly estimating channels used to propagate desired and interfering signals received by a wireless receiver. A blind parameter estimator in the wireless receiver includes a forward parameter estimator and a backward parameter estimator that each include an equalizer and a channel estimator for generating forward ... 03/23/06 - 20060062290 - Non-iterative time-domain equalizer A method for forming a non-iterative time-domain equalizer (TEQ) and apparatus corresponding thereto. A channel response H(z) is followed by a TEQ response A(z) and a residual output B(z) is chosen so that its degree is less than a cyclic prefix. An error signal is formed so that E(z)=H(z)A(z)−B(z). With ... 03/16/06 - 20060056502 - Scaled signal processing elements for reduced filter tap noise An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control ... 03/02/06 - 20060045176 - System and method for digital adaptive equalization with failure detection and recovery An adaptive equalization method and system for automatically adjusting an equalizer to compensate a signal's frequency dependent loss is disclosed. The method comprises setting the equalizer's initial coefficient value, receiving an equalized signal, identifying a positive to zero transition of the equalized signal, generating a common mode voltage from the ... 02/23/06 - 20060039459 - System and method for linear distortion estimation by way of equalizer coefficients Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients. ... 02/23/06 - 20060039458 - Adaptive filtering using fast affine projection adaptation A method of adaptive filtering using fast affine projection (FAP) that allows for direct solution of the projected error vector from the autocorrelation matrix using a backward and forward recursion technique or LDLT factorization of the autocorrelation matrix followed by forward substitution, scaling and backward substitution. The method results in ... 02/16/06 - 20060034362 - Apparatus for channel equalization using multi antenna and method thereof The present invention provides an apparatus for channel equalization and method thereof, by which a digital signal received via a plurality of antennas is equalized. The present invention includes receiving digital transmission signals using a plurality of antennas, respectively, initializing equalizer coefficients and equalizing the received signals respectively, adding the ... 02/09/06 - 20060029126 - Apparatus and method for noise enhancement reduction in an adaptive equalizer A method for noise enhancement reduction in an adaptive equalizer comprising a plurality of filter tap cells having respective coefficients and tap data values. First, a step size is determined based on a norm value of an ith parameter of an estimated channel response. The coefficient of the ith filter ... 02/02/06 - 20060023780 - Equaliser circuit One embodiment of an equaliser circuit has an FIR filter 116 in the asynchronously oversampled domain with a filter coefficient adaptation module that adapts the filter coefficients to the transfer function of a data read channel. Applications include tape drives, drives for optical and magnetic discs as well as receivers. ... 01/19/06 - 20060013296 - Multidimensional decision-directed trained adaptive equalization An embodiment of the invention is a technique to equalize received samples. An equalizer to equalize a multidimensional signal transmitted over a communication channel and having a dimensionality of four or higher. The equalizer is adaptively decision directed trained. ... 01/12/06 - 20060007998 - Equalization for dmt and ofdm communication systems The invention provides a DMT or OFDM equalization system that deals with each tone not only separately, but also globally, which provides better overall performance. In the inventive system, only M+T variables are required to be determined, where M is the number of tones and T represents the number of ... 01/05/06 - 20060002462 - Method and apparatus to control operation of an equalizer A method and an apparatus to control an equalizer. A signal to noise ratio of an output of the equalizer is measured, the measured signal to noise ratio is fed back to the equalizer controlling apparatus, and convergence information of the equalizer is monitored and at the same time effective ... 12/29/05 - 20050286626 - Method for adjusting parameters of equalizer A method for adjusting parameters of an adaptive equalizer makes use of a transmitted signal received by a receiving end to adjust parameters of an adaptive equalizer. First, signal strengths of a first frequency band and a second frequency band in the transmitted signal are detected. The signal strengths of ... 12/29/05 - 20050286625 - Equalizer capable of adjusting step size and equalization method thereof An equalizer capable of adjusting a step size and an equalization method. The equalizer includes an equalizer filter to remove noise from a digital symbol signal, an error determiner to determine an error of an output of the equalizer filter, a channel measurer to measure and output a channel impulse ... 12/29/05 - 20050286624 - Method and apparatus to automatically control a step size of an lms type equalizer A method and apparatus to automatically control a step size of a least mean squares (LMS) equalizer. An optimal step size can be selected by checking a signal to noise ration (SNR) of the LMS equalizer output according to a change in the step size. The LMS equalizer includes a ... 12/29/05 - 20050286623 - Adaptive filter structure with two adaptation modes In some embodiments, an adaptive filter employs two adaptation modes, where during one adaptation mode the adaptive filter is updated only when the received training sample is a first binary value and during the other adaptation mode the adaptive filter is updated only when the received sample is a second ... 12/29/05 - 20050286622 - Kalman-viterbi joint channel equalizer In a channel equalizer applicable to a digital television receiver, a forward filter and a backward filter perform filtering to an input signal and a predetermined signal. A Viterbi decoder corrects errors during a transmission procedure in a blind mode. A training symbol storing block stores training symbols. An output ... 12/22/05 - 20050281327 - Hierarchical adaptive equalizer and design method thereof A hierarchical adaptive equalizer and a design method thereof are disclosed. The design method divides N delay elements into a plurality of adaptive algorithms, each of the adaptive algorithms having β delay elements. The design method logically structures a hierarchical tree with the adaptive algorithms. The hierarchical tree comprises a ... 12/08/05 - 20050271135 - Receiving device and analog-to-digital conversion device Disclosed is a receiving device which comprises first and second AD converters for inputting a received analog signal and converting the analog signal to digital signals in response to sampling clock signals of mutually different phases, first and second adaptive equalizers for respectively receiving outputs of the first and second ... 12/01/05 - 20050265439 - Waveform equalize, waveform equalization method, and integrated circuit with the multiplication by αi(n) being performed by the update amount setting unit. Here, 0<αi(n)≦1, and αi(n) is a function f(Ci(n−1)) which monotonically increases with Ci(n−1). ... 11/24/05 - 20050259726 - Adaptive receive-side equalization An adaptive receiver equalizes incoming data expressed as a series of symbols, the degree of equalization being adjusted by some adaptive control logic. An amplitude detector samples the amplitude of the eye openings of incoming symbols and conveys the resulting measures of eye amplitude to the adaptive control logic. The ... 11/10/05 - 20050249275 - Timing recovery method and device for combining pre-filtering and feed-forward equalizing functions Timing recovery method and device for combining pre-filtering and feed-forward equalizer functions are proposed and used in a digital communication system. A signal receiver is provided to receive a signal transmitted from a signal transmitter in the communication system, and recovers a sampling clock phase of the received signal to ... 11/10/05 - 20050249274 - Linear filter equalizer An apparatus (100) and a method (400) suitable for use in a communication device by equalizing an input signal received to mitigate multipath distortion effects present in the input signal in the communication device are provided. A first filter (102) samples the input signal (104) and generates a first filter ... 11/10/05 - 20050249273 - Method and apparatus for generating filter tap weights and biases for signal dependent branch metric computation A method and apparatus are provided for determining a plurality of filter tap weights or biases (or both) for a noise predictive filter used to generate one or more signal dependent branch metrics. A filter tap weight or filter bias (or both) are adaptively accumulated for each possible data condition. ... 11/10/05 - 20050249272 - Dynamic range control and equalization of digital audio using warped processing This invention describes a method for adjusting the loudness and the spectral content of digital audio signals in a real-time using warped spectral filtering. A warped processing module modifies a spectral content of a digital audio signal with a set of gains for a plurality of non-linearly-scaled frequency bands determined ... 10/20/05 - 20050232347 - Apparatus and method for noise enhancement reduction in an adaptive equalizer A method for noise enhancement reduction in an adaptive equalizer comprising a plurality of filter tap cells having respective coefficients and tap data values. First, a step size is determined based on a norm value of an ith parameter of an estimated channel response. The coefficient of the ith filter ... 10/13/05 - 20050226315 - Method and apparatus for tuning equalizer A method for tuning coefficients of an equalizer includes: generating an error value according to a comparison between an output signal of the equalizer and a threshold value; and performing a LMS algorithm based on the error value to adjust the coefficients of the equalizer. ... 10/06/05 - 20050220186 - Timing adjustment method and digital filter and receiver using the method A delay unit comprises a plurality of taps for sequentially delaying an input digital received signal. A shift unit changes combinations of a plurality of digital received signals delayed by the delay unit and a multiplier unit. A coefficient retaining unit manages a plurality of coefficients to be multiplied by ... 10/06/05 - 20050220185 - High-speed adaptive interconnect architecture with nonlinear error functions A low cost and high speed equalizing receiver structure is provided for improved inter-chip and inter-module communications. The receiver is able to recover data from a corrupted waveform from a signal wire such as one found on data, address or control wires in a microsystem architecture. The receiver can be ... 09/15/05 - 20050201457 - Distributed arithmetic adaptive filter and method Systems and methods for very high throughput adaptive filtering using distributed arithmetic are disclosed. One distributed arithmetic adaptive filter may include a memory for storing a first and second lookup table. The first lookup table may include 2K filter weights addressed by the rightmost bits of each of K signal ... 09/15/05 - 20050201456 - Systems and methods for equalization of received signals in a wireless communication network An equalizer comprises a hard decision block which feeds an FEC block and a shift register, which uses past estimates during a first iteration. The output of the FEC block is fed back to the shift register during a subsequent iteration to fully remove any inter chip interference. ... 09/15/05 - 20050201455 - Equalizer architecture An equalizer is divided between two tapped delay lines. One half of the sampled data is passed along one delay line, and the other half of the sampled data is passed along the other delay line. Delayed samples are passed to two summing circuits, and the output is formed from ... 09/08/05 - 20050195894 - Method and circuit for adaptive equalization of multiple signals in response to a control signal generated from one of the equalized signals In preferred embodiments, an adaptive equalization circuit including at least two equalization filters (each for equalizing a signal transmitted over a multi-channel serial link) and control circuitry for generating an equalization control signal for use by all the filters. The control circuitry generates the control signal in response to an ... 09/08/05 - 20050195893 - Bit-edge zero forcing equalizer Bit-Edge Zero Forcing Equalizer. A novel solution is presented by which a BE-ZFE (Bit-Edge Zero Forcing Equalizer) is employed to drive an error term within a data signal to an essentially zero value. This new BE-ZFE looks at values of data that occur at the bit edges of a data ... 09/01/05 - 20050190831 - Digital filter enabling consecutive readout of filter coefficients from a continuous sequence of storage locations during convolution calculation A digital filter performs a convolution calculation on each of successively updated sets of N stored data values, with the calculation including multiplying each data value by a specific corresponding one of a set of N filter coefficients, wherein the N filter coefficients are respectively held in a first continuous ... 08/25/05 - 20050185710 - Adaptive equalizer with dc offset compensation A method for compensating for attenuation in an input signal includes receiving an input signal, communicating a first portion of the input signal on a first path, communicating a second portion of the input signal on a second path, and communicating a third portion of the input signal on a ... 08/18/05 - 20050180497 - Adaptive digital filter An adaptive digital filter includes a filtering circuit and a coefficient renewal circuit. The filtering circuit has a coefficient a defined by a fundamental formula: a[n+1]=a[n]+β·e[n]·q[n]/p[n]. β is a number greater than 0 and smaller than 2, e[n] is a difference between the input and the output of the filter, ... 08/11/05 - 20050175081 - Decision-feedback equalizer and method of updating filter coefficients Exemplary embodiments of the present invention provide an equalizer combined with a decoder and a method of updating filter coefficients. The method may include calculating output error signals ek, multiplying the output error signals by a parameter, obtaining a partial value by multiplying a delayed decoder decision stored in a ... 08/04/05 - 20050169360 - Signal generator using iir type digital filter; and method of generating, supplying, and stopping its output signal A signal generator using an IIR type digital filter (recursive type digital filter) having multipliers A and B in a feedback loop. A control unit 2 provided for the signal generator sets and changes coefficients of the multipliers A and B and generates, supplies and stops an output signal while ... 08/04/05 - 20050169359 - Apparatus and method for multi-channel equalization A communication system with a multi-channel array antenna utilizes a receiver matching process that adapts the pass band frequency response of each channel to a selected reference channel. This process is implemented digitally by inserting a tapped delay line filter in each channel, selecting one of the channels as a ... 07/28/05 - 20050163208 - Equalized signal path with predictive subtraction signal and method therefor A digital communication transmitter serves as a signal path (10) which uses an adaptive equalizer (18) in a predistortion role. The adaptive equalizer (18) pre-distorts a complex digital communication signal (12) that need not exhibit any distortion. Subsequent analog distortion-introducing segments (24, 30, 36, 42) then distort a predistorted signal ... 07/21/05 - 20050157780 - Signaling system with selectively-inhibited adaptive equalization An integrated circuit having a receiver that selectively inhibits incoming data from being used to update adaptively generated controls. Sampling circuitry generates a plurality of samples of an incoming signal. Control circuitry generates an inhibit signal in either a first state or a second state according to whether the plurality ... 07/14/05 - 20050152444 - Digital filter Disclosed is a digital filter with a combined architecture of a 4-tap real valued filter and a-tap complex valued filter, whereby the filter size is reduced and no output delay is occurred due to the filter operations. According to the present invention, the digital filter is operated either in real ... 06/23/05 - 20050135469 - Method and system for adaptive prefiltering of a signal for transmission A method and system for adaptive prefiltering of a signal for transmission is described. The method includes determining a reference starting value of coefficients for a receiver equalizer filter, receiving an indication of a change in channel characteristics based on a signal received at the receiver equalizer filter, computing coefficients ... 06/23/05 - 20050135468 - Feed forward filter Disclosed are a multi-tap filter, and method of using same, to filter an analog input signal to provide an equalized analog signal. Each of a plurality of coefficients in the multi-tap filter may be updated based, at least in part, upon a comparison of the equalized analog signal with one ... 06/23/05 - 20050135467 - Feedback filter Disclosed are a system, method and device for generating an equalized signal from an input signal. Symbols in the equalized signal may be detected on each of a sequence of symbol intervals to recover a symbol value in the symbol interval. A feedback coefficient may be applied to a symbol ... 06/16/05 - 20050129106 - Equalizer and method of setting initial value for same An equalizer is provided which is capable of making a filter factor to be set in the equalizer having an equalizing filter converge rapidly and a method is provided for setting an initial value for the rapid convergence of the filter factor. In the equalizer having a filter factor computing ... 06/16/05 - 20050129105 - Determination of the adaption coefficient for adaptive equalizers in communication systems based on the estimated signal-to-noise ratio and the mobile speed Adaptive chip-based equalizers are considered for the mobile receiver of CDMA communication systems as a low complexity solution that is capable of removing multipath interference and improving performance relative to the conventional Rake receiver. The performance of adaptive equalizers is critically impacted by the mobile's speed which is directly related ... 06/09/05 - 20050123033 - Method and apparatus for dynamically inserting gain in an adaptive filter system A method and apparatus for dynamically inserting gain in an adaptive filter is taught. This selective insertion of gain may be used to allow an adaptive filter to converge more quickly and/or to overcome inherent limitations of the adaptive filter. An echo canceller (e.g. 20 and 22 in FIG. 1) ... ### FreshPatents.com Support |