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6790688 
Method of high pass filtering a data set
An improved method of high pass filtering a data set includes flattening the data set and then filtering the flattened data set with an adaptive filter. The data set is flattened by fitting it to... 

6788785 
Stable adaptive filter and method
A Fast Affine Projection (FAP) adaptive filter and method of adaptive filtering are disclosed, which reduce instability associated with FAP filters caused by error accumulation in the process of... 

6785327 
Multiported register file for burst mode coefficient updating
Multiported register files used for storing coefficients in adaptive FIR are improved upon by implementing a split memory architecture that has the ability to separately control the least... 

6782105 
Reflection sound generator with series of main and supplementary FIR filters
A reflection sound generator has a first filter of Finite Impulse Response (FIR) type that is provided with a first set of parameters representing a first distribution pattern of reflection... 

6778598 
Method for modifying the channel impulse response in TDMA systems
The present invention proposes a device for processing received signals (y) having been transmitted via a transmission channel (1), comprising: estimation means (2, 2a) adapted to obtain an... 

6778710 
Method for generating increasing shiftinvariant filters
A novel method for implementing a filter for processing discrete signal image is presented having the steps of first obtaining a plurality of sample values from said discrete signal image and then... 

6771701 
Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis
A configurable adaptive filter that is used for echo cancellation is disclosed, which includes a method of detecting a voice or novoice signal. The presence of a voice or novoice signal is... 

6768796 
System and method for echo cancellation
Methods and systems for echo cancellation are provided. According to one method, when a far end signal with an echo having a major body and a pure delay portion is received, a filter having a... 

6766021 
Echo canceller
A method of echo cancellation for a signal transmission system in which the size of the step used to adapt filter coefficients is adjusted in accordance with the echo delay and in which stationary... 

6766340 
Method for filtering signals from nonlinear dynamical systems
A method for filtering signals from a nonlinear dynamical system is provided. An initial enhanced point is set to a noisy point obtained from the signals. An intermediate enhanced point is... 

6757702 
Adaptive filter
The invention relates to a method for calculating a least mean square algorithm using an Ntap filter. A modified least mean square algorithm is used for the calculation. In a first calculation... 

6744886 
Adaptive filter utilizing proportional affine projection algorithm
An adaptive filter suitable for network echo cancellation and other applications contains a coefficient vector update device for feeding coefficient vector updates to a finite impulse response... 

6745218 
Adaptive digital filter
An adaptive digital filter of the present invention includes: a pipelined filtering section for performing a filtering operation based on input data and coefficient data so as to output filtered... 

6738480 
Method and device for cancelling stereophonic echo with frequency domain filtering
The filtering coefficients of a frequency domain stereophonic echo canceller are adapted by a method which takes account of the crosscorrelation between the input signals relating to the two... 

6735304 
Adaptive filter and echo canceller using the same
An adaptive filter allowing rapid adaptation to a sudden and great change in a system to be estimated is disclosed A memory stores position information indicative of a signal block connected to... 

6732129 
Adaptive filtering and learning system having increased convergence speed and stability
The rate of convergence of an adaptive system is optimized as a function of the stability with which it converges to a desired state. In the adaptive technique according to the invention, for... 

6724743 
Method of conjoint detection of a set of CDMA codes
A method of conjoint detection of a set of CDMA codes received at a plurality of antennas of a receiver like a mobile telephone receiver. The codes are transmitted via a transmission channel with... 

6721427 
Analog filter for digital audio system and audio amplifier for using the same
An analog filter is connected at the output of a D/A converter. The analog filter eliminates higher frequency components than the original basic frequencies for a digital audio system and improves... 

6714956 
Hardware accelerator for normal leastmeansquare algorithmbased coefficient adaptation
A system and method for accelerating leastmeansquare algorithmbased coefficient adaptation which executes in one machine clock cycle one tap of the leastmeansquare algorithm including data... 

6704354 
Method and apparatus of providing adaptive equalization using sign permutation filtering
The present invention is a system and system for equalizing a signal in a communication system. The signal is represented by samples at a time instant, and the samples are filtered using a sign... 

6687723 
Trimode adaptive filter and method
An adaptive filter having a hybrid structure and capable of operating in a trimode regime is disclosed. The trimode adaptive filter includes three subfilters which operate in a fast convergence... 

6684234 
Method for filtering a digital signal sequence
A method for filtering a digital signal sequence with adaptive filters given assistance of discrete parameter wavelet transformation is recited that, among other things, can be utilized in... 

6684233 
Adaptive filter, control method of adaptive filter and storage medium storing therein program thereof
An adaptive filter, a control method of the adaptive filter, and a storage medium storing therein a program for executing the control method thereof enable a tap weight control method to be... 

6675184 
Adaptive type signal estimator
In an adaptive type signal estimator, an estimation signal storage unit outputs the first sample signal to which nonlinear distortion is added. A convolution arithmetic unit adds linear distortion... 

RE38374 
Training a recursive filter by use of derivative function
A method of training a recursive filter comprises updating recursive parameters of the filter with delta values computed from sampling of an error signal and obtaining derivative terms of the... 

6668014 
Equalizer method and apparatus using constant modulus algorithm blind equalization and partial decoding
A digital communication receiver includes a blind equalizer using the Constant Modulus Algorithm (CMA) to compensate for channel transmission distortion in digital communication systems. Improved... 

6665401 
Method for canceling echo
A method for canceling echo. A threshold value signal is set to a preset value and the threshold value signal and a medium value signal are keep at a level of the preset value. Diagnosis is made... 

6665696 
Delayed adaptive leastmeansquare digital filter
A delayed adaptive leastmeansquare (LMS) filter, which has one filter coefficient per tap and acquires a new data sample each frame, calculates a finite impulse response (FIR) filter output and... 

6658055 
Method for accelerating the training of adaptive echo cancelers in the presence of interfering sinusoidal signals
A system and method for canceling both an echo signal and a spurious sinusoidal signal, such as a telephone dialtone or a carrier signal, from a return signal in a communications system involves... 

6654412 
Adaptive filter and learning method thereof
The present invention provides an adaptive filter and a learning method therefor to eliminate real output signals generated by input signals and an environment signal response. The adaptive filter... 

6650688 
Chip rate selectable square root raised cosine filter for mobile telecommunications
A square root raised cosine filter for a mobile transceiver may be adapted to operate with a variety of potential chip rates such as the four chip rates associated with IMT2000 standard. The... 

6650756 
Method and apparatus for characterizing audio transmitting system, and method and apparatus for setting characteristics of audio filter
A designing system for adaptively characterizing an audio transmitting system has a white noise generating unit for generating a white noise signal. A speaker radiates the white noise generated by... 

6643676 
Initialization /prewindowing removal postprocessing for fast RLS filter adaptation
The present invention, generally speaking, accelerates convergence of a fast RLS adaptation algorithm by, following processing of a burst of data, performing postprocessing to remove the effects... 

6633894 
Signal processing arrangement including variable length adaptive filter and method therefor
A signal processor includes an adaptive filter that generates an output signal as a function of an input signal and of weighting coefficients stored in a memory. An error detector generates an... 

6611602 
Adaptive removal of resonanceinduced noise
Noise is removed from the digitized output of a sensor, subject to undesired resonance, even when the resonant frequency is unknown or drifts, with sufficiently low phase delay for the sensor to... 

6606641 
System for varying the dynamic range of coefficients in a digital filter
A digital filter includes a plurality of filter cells, each of which includes circuitry to determine a coefficient for the filter cell, to adjust the coefficient in accordance with a gain that is... 

6591282 
Apparatus and method for a DCInsensitive FIR filter for optical PRML channel
A Finite Impulse Response filter (FIR) reduces the effect of baseline wandering of the input signal on convergence. The FIR includes an adder, a DCInsensitive error calculator, a DCInsensitive... 

6590932 
Methods, receiver devices and systems for whitening a signal disturbance in a communication signal
Methods, systems and receiver devices are provided which may reduce the average power of a signal disturbance by whitening the signal disturbance. In one aspect, a finite impulse response filter... 

6581081 
Adaptive size filter for efficient computation of wavelet packet trees
This invention describes a novel method and system that implements wavelet packet trees and inverse wavelet packet trees. A modified Recursive Pyramid Algorithm (RPA) is advanced by this... 

6570986 
Doubletalk detector
A communication system includes an echo canceller and doubletalk detector. The echo canceller includes an adaptive finite impulse response filter that generates an adaptive filter weight vector.... 

6563869 
Digital signal processing circuit and audio reproducing device using it
For a leftchannel input audio signal, digital filters 30LL and 30LR are provided for reproduction of impulse responses used for locating an acoustic image outside the head of a listener, and for... 

6542540 
Integrated analog adaptive equalizer
An adaptive equalizer provides different degrees of high frequency boosts to the received signal, while retaining a relatively constant phase shift for each boost setting. The response of the... 

6539064 
Multiple data rate filtered modulation system for digital data
A multirate data modulation circuit includes a multirate data conversion circuit and a modulator such as a direct digital synthesis circuit. The multirate data conversion circuit receives... 

6523052 
Method and architecture to facilitate achieving a fast EPR4 equalization startup in a magnetic recording read channel
A method and circuit (10) for achieving a fast EPR4 equalization startup for an FIR filter (14) in a magnetic recording read channel is presented in which a threelevel adaptation in an LMS... 

6519342 
Method and apparatus for filtering an audio signal
A method and an apparatus for filtering an audio signal include the steps of making the audio signal available in digitalized form, wherein the duration of the sampling interval is half or less... 

6501329 
Adaptive filtering for improved RMStoDC signal conversion
Adaptive filters are presented that dynamically adjust the level of filtering of signals output from a sigmadelta or noiseshaping pulse code modulator RMStoDC converter to efficiently remove... 

6483867 
Tracking loop realization with adaptive filters
A method, system and device for codephase tracking and/or carrier tracking the broadcast signal streaming a spread spectrum signal using an adaptive and time variant digital filter based on an... 

6466615 
Delay locked loop based circuit for data communication
An apparatus including a plurality of quantizers each configured to compare a selected threshold signal with an input signal and generate an output, a multiplexer, coupled to the plurality of... 

6466616 
Power efficient equalization
An apparatus and method are provided that effectively minimizes the computational load and reduces the overall power consumption in a receiver by adjusting the number of taps used in a prefilter... 

6463099 
Blind channel equalizers and methods of blind channel equalization
Blind channel equalization methods, receivers and systems incorporating the same for use in a multipleinput, multipleoutput, (MIMO) wireless communication system are described. Signal... 