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6581080 |
Digital filters
A technique for generating coefficients for a digital filter. A gain control signal with a value of reference gain and a frequency control signal with a value of reference frequency are provided. A...
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6574647 |
Filter arrangement
The invention relates to a filter arrangement for separating analog or digital baseband signals, for example, POTS or ISDN signals and digital wideband signals, which are simultaneously transmitted...
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6553396 |
Filter bank constituting method and filter bank apparatus
A method and apparatus for constructing a filter bank designed to split the frequency spectrum of digital signals into plural bands. Specifically, a low-pass analysis filter unit (H 0 (z)), adapted...
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6542539 |
Multiported register file for coefficient use in filters
Multiported register files for use in storing coefficients in adaptive FIR filters. incorporate computational ability, e.g., the ability to perform computation on coefficient values or derivatives...
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6542914 |
Method and apparatus for increasing bandwidth in sampled systems
Systems that sample a continuous analog time-domain signal. The invention is particularly applicable to systems whose analog components have a bandwidth limit below that desired or specified. The...
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6529925 |
Method for reducing the crest factor of a signal
A method for reducing the crest factor of a signal, the signal being represented by a digital signal vector whose elements are sampled values of the signal. The method includes the steps of...
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6526429 |
Method for designing all pass digital filters
A method for designing an all pass filter, in accordance with the present invention, includes providing a plurality of signals having a group delay, and normalizing the group delay to determine a...
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6523051 |
Digital signal transformation device and method
A digital signal transformation method, in which the original samples (x 2i ; y 1 2i ) of the digital signal are transformed into output samples (y 1 2i , x 2i ). Any output sample being calculated...
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6519496 |
Feedback controller, digital filter device, and storage device
An apparatus has an input hold circuit for sequentially holding digital feedback signals sequentially transmitted at a sampling period, and for sequentially outputting the transmitted feedback...
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6510354 |
Universal robust filtering process
A universal robust filtering process is adapted for eliminating the need of prediscretizing a continuous-time differential model into a discrete-time difference model. It provides a universal...
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6507859 |
Signal processing method
A signal processing method enabling reproduction of a broadband signal free of aliasing which transforms a plurality of discrete signals obtained by sampling an identical continuous signal using...
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6496845 |
Low pass filter
A low pass filter is capable of prevention of increasing of circuit scale there of according to increasing of tap number. The low pass filter initiates counting operation in response to a data...
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6480534 |
Apparatus and method for a reduced component equalizer circuit
In an equalizer filter unit, the filter is divided into a plurality of sequential segments. While all the components of the equalizer unit multiply data signal groups by the a coefficient signal...
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6466633 |
Methods and apparatus for implementing a receiver filter with logarithmic coefficient multiplication
A method of filtering a signal, the method including the steps of sampling analog input signal, thereby providing a purality of digital complex input signal samples the each of the samples...
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6466957 |
Reduced computation system for wavelet transforms
An improved architecture for efficiently calculating a discrete wavelet transform is presented. The present system appreciates the associated redundancies of calculations and proposes a topology...
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6463450 |
Method and apparatus for the location of the peak of a function using a filter bank
A method and apparatus for determining the location of the peak of a signal using an adaptive filter bank. The method includes the steps of providing a set of calculated output points for the...
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6453331 |
Method and system for filtering force constant table for accurate torque modeling
A method and system of filtering an unfiltered servo torque table of a disc drive where a plurality of data points are added to the beginning and end of the unfiltered servo table and the table is...
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6430524 |
Data processing method and apparatus
A data processing apparatus for processing input data and for outputting the processed data as output data achieves effective noise reduction. An input-reliability calculator calculates an input...
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6418548 |
Method and apparatus for preprocessing for peripheral erroneous data
A method, apparatus, and article of manufacture for restoring a deteriorated signal to an undeteriorated signal. A deteriorated signal consists of a plurality of deteriorated and undeteriorated...
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6408022 |
Equalizer for use in multi-carrier modulation systems
The present invention provides an optimal procedure for determining in the time domain equalizer coefficients for an equalizer, where the equalizer compensates for the effects of the communications...
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6405228 |
Self-adjusting optimal delay time filter
A circuit comprising a filter circuit and a delay circuit is disclosed. The filter circuit may be configured to present an output signal in response to (i) an input signal having one or more...
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6404357 |
Digital/analogue communication system for increasing transfer efficiency of digital sample data
A digital/analogue communication system is described, where data is generated and received by a processing unit in a digital format and transmitted via a communication path in an analogue format. A...
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6405227 |
Digital crossover and parametric equalizer
A DSP-based and multi-channel digital filter chip providing crossover filtering and parametric equalization. Crossovers can be low-pass, high-pass, or band-pass filters with programmable cutoff...
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6384864 |
Letter-box filtering circuit and method using the same
A letter-box filtering circuit and a method of using the same that includes a preprocessing filter circuit and a filtering circuit to reduce or correct the round-off errors generated when...
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6377967 |
Efficient digital integration technique filter
An efficient digital integration technique (EDIT) filter uses a local oscillator pattern to provide the desired weighting for an input signal. A product waveform is determined by multiplying the...
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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...
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6373910 |
Rapid acquisition dispersive channel receiver integrated circuit
An integrated circuit includes a reconfigurable FIR filter has an input port for receiving digital input signals and an output coupled to a coherent signal processor and a coherent memory. The FIR...
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6370365 |
Selective call radio having an integrated frequency conversion circuit
A selective call radio ( 300 ) includes receiver ( 200 ). The receiver in turn includes an antenna ( 202 ) for receiving a radio signal having a first operating frequency, an amplifier( 204 )...
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6370191 |
Efficient implementation of error approximation in blind equalization of data communications
A cable modem ( 20 ) having a blind equalizer ( 40 ) in its equalization function ( 28 ) is disclosed. The blind equalizer ( 40 ) includes an adaptive equalizer ( 44 ) and an approximating update...
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6370248 |
Synchronizing autonomous chaotic systems using filters
A system for synchronizing chaotic transmitters and receivers that is less sensitive to channel effects than other known chaotic communication methods. The system employs duplicate transmitter and...
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6366872 |
Data prediction in DSP methods for transient spectroscopies
Observation of transient phenomena in an oversampled regime is implemented with a digital filter pre-charged with a list of pseudodata obtained by prepending one or more pseudo datums to the...
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6360239 |
Noise-shaped coefficient rounding for FIR filters
Improved methods and systems for generating quantized filter coefficients for a desired filter response are provided. One embodiment provides a technique that can be used to quantize the...
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6353644 |
System and method for performing time domain equalization
Disclosed is a system and method for signal conditioning and equalization in the time domain, preferably in a discrete multi-tone (DMT) modem. The system preferably includes a processor operating...
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6343094 |
Spread spectrum signal receiving method and apparatus for CDMA cellular communication
An improved filter for use in a CDMA receiver having an RF front end for splitting a received signal into I and Q components, A/D converters for converting the I and Q components into I and Q...
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6330228 |
Method and device for measuring the proportion of an ATM cell stream satisfying a determined criterion
A process and device for measuring the proportion of ATM cells satisfying a criterion. The process includes allocating a first numerical value to the cells passing through a specified point of an...
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6330579 |
Fir filter based upon squaring
An improved FIR filter based upon squaring is used to self-determine a filter constant equal to the sum-of-squares of the filter coefficients. An input signal is forced to zero for T samples, where...
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6304847 |
Method of implementing an inverse modified discrete cosine transform (IMDCT) in a dial-mode audio decoder
A method of implementing a dual-mode audio decoder and filter is provided. The inverse modified discrete cosine transform (IMDCT) method and circuit for a dual-mode audio decoder perform the IMDCT...
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6304679 |
Method and apparatus for implementing two-dimensional digital filters
A structure for implementing a plurality of two-dimensional digital filters, such as finite impulse response filters, in an efficient manner. The structure includes a plurality of first stage...
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6298361 |
Signal encoding and decoding system
In band-splitting acoustic signals and subsequently encoding and decoding the band-split signals, band-splitting and band-synthesizing processing with high accuracy is desirable. To this end, an...
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6295322 |
Processing apparatus for synthetically extending the bandwidth of a spatially-sampled video image
An input data stream of pixel values, representing an original video image having predetermined horizontal and vertical resolutions that has been spatially sampled at a first spatial sampling...
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6289443 |
Self-priming loop execution for loop prolog instruction
A method of operating a multiple execution unit microprocessor in a software pipelined loop is disclosed. This method executes the loop body before the pipeline is fully initialized, thus replacing...
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6285971 |
Method for real-time nonlinear system state estimation and control
A method for the estimation of the state variables of nonlinear systems with exogenous inputs is based on improved extended Kalman filtering (EKF) type techniques. The method uses a discrete-time...
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6279019 |
Decimation filtering apparatus and method
A decimation filtering apparatus using interpolated second order polynomials compensates for a droop caused by a CIC (Cascaded Integrator-Comb) filter. The decimation filter includes a CIC...
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6278753 |
Method and apparatus of creating and implementing wavelet filters in a digital system
A method for generating a wavelet filter provides improved selectivity with minimal computational intensity in digital data systems (300,400). The process begins by generating an initial wavelet...
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6275835 |
Finite impulse response filter and method
A finite impulse response filter (90) has a data memory bank (92, 350) for storing data vectors and a coefficient memory bank (91, 300) for storing coefficient vectors. Filtering is done by...
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6269115 |
Linear-phase filter implementation using orthonormal laguerre expansions
A forward impulse response, linear-phase matched filter, receiving as an input a sampled digital representation of an input signal, x(n), having n samples, and providing a filtered output, y a ...
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6260052 |
Digital signal processing apparatus and method therefor
A digital communications signal processing apparatus applied to digital radar signal processing and a method therefor are provided. The digital signal processing apparatus in which windowing,...
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6249796 |
Real-time technique for reducing the settling time of a high pass filter
A technique for resetting a HPF for improving its settling time in response to a sharp transition in its input signal, by rapid input and clocking through the high-pass filter (HPF) of new data...
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6243729 |
Digital finite-impulse-response (FIR) filter with a modified architecture based on high order Radix-N numbering
A fast FIR filter 100, a system, and a method that increases the operating speed of a filter. The system uses a high order numbering system, in particular Radix-8, and appropriate control lines,...
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6237016 |
Method and apparatus for multiplying and accumulating data samples and complex coefficients
A method and apparatus for performing complex digital filters. According to one aspect of the invention, a method for performing a complex digital filter is described. The complex digital filter is...
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