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6061410 
Frequency ratio estimation arrangement and method thereof
A communication system includes a data sampling rate converter that uses a closedloop control arrangement to convert an input signal at a first sampling rate to a second, asynchronous, sampling... 

6032168 
Computer system to perform a filter operation using a logarithm and inverselogarithm converter and methods thereof
In a parallel computer system having N parallel computing units a data pipeline connects all the computing units. In addition the computing units are coupled to a random access memory so that each... 

6032166 
Programmable analog bandpass filtering apparatus and method and design method for a discrete time filter
A desired programmable complex analog bandpass filter is replaced by a "black box" that receives an analog continuoustime signal and delivers an analog continuoustime signal, just as the analog... 

6023717 
Method and apparatus for polyphase digital filtering in a mobile telephone
A discrete polyphase digital filter is provided having only a single multiplier and a single cumulative adder for use in a mobile telephone. In one implementation, the filter is a discrete Nphase... 

6023571 
System for filtering events occurred within a predetermined period of time
A system for filtering events which have occurred within a predetermined period of time includes a first generation unit for generating association rules between the events (parameters) which... 

6021419 
System for filtering broadcast digital information in accordance with channel identifiers stored in preference list which can be dynamically updated via command through network
A filter adaptor connects a computer to a network through a network connection. The network has a large plurality of broadcast type messages having a given protocol. Each of the broadcast messages... 

6018597 
Method and apparatus for changing or mapping video or digital images from one image density to another
A method and apparatus for resizing digital or stored images initially retrieves a onedimensional sample of the image, such as a line of pixels. A final image size D is determined so that the... 

6009446 
Method and apparatus for digital filtration of signals
Digital filtration is accomplished by splitting the incoming signal into phases. Each phase is then converted into a weighted sum reflecting the design of a prototype filter. Then the data is... 

6009445 
Reconfigurable infinite impulse response digital filter
A reconfigurable infinite impulse response lowpass filter is described in which the frequency response can be changed by changing a single parameter while the filter gain of the filter remains... 

6003051 
Magnetic storage device and filter adjusting method applied to the same
The cutoff frequency and boost value of an analog filter on a read channel is set to initial values When the data is read from a disk, the read data is subjected to PR equalization at an FIR... 

5999956 
Separation system for nonstationary 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... 

5995989 
Method and apparatus for compression and filtering of data associated with spectrometry
A method and apparatus for compression and filtering of data associated with spectrometry. The method and apparatus serves to recognize peak events and filter data associated with background... 

5987484 
Digital filtering system
A digital filtering system is fed by input signal and produces an output signal from either a relatively low bandwidth filter or a relatively wide bandwidth filter selectively in accordance with... 

5987487 
Methods and apparatus for the processing of digital signals
Methods and apparatus for the processing of digital signals having high speed and low power dissipation. The apparatus uses Residue Number Systems (RNSs) to represent the signals and/or... 

5983253 
Computer system for performing complex digital filters
A method and apparatus for performing complex digital filters. According to one aspect of the invention, a computer system generally having a transmitting unit, a processor, and a storage device... 

5983255 
Digital filter and control system employing same
In the control system disclosed herein, multiple input data streams are processed or filtered to generate multiple output streams by a filter which combines efficient batch processing of a fixed... 

5983254 
Zerolatency 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,... 

5963273 
Circuit for carrying out digital Nyquist filtering of IF intermediate frequency signals
The circuit for the digital filtering of IF intermediate frequency video signals comprises an A/D (analog/digital) converter and a Nyquist filter (N); an analog prefilter, suitable for selecting... 

5950151 
Methods for implementing nonuniform filters
Nonuniform filters are designed with a method which utilizes an orthogonal subbanding technique. A tiling representation of a signal is established. The signal is localized for both time and... 

5949677 
Control system utilizing fault detection
A control architecture having improved fault detection and correction capabilities is disclosed. The system comprises primary and monitor control systems, each having an associated control signal.... 

5944775 
Sumofproducts arithmetic unit
A sumofproducts arithmetic unit includes a coefficient register, a data register, a multiplier, an adder, and a data bus used for the transfer of data to and from an external unit. Provision is... 

5943642 
Method of designing subband digital filter bank
A method of designing a subband digital filter bank having first and second analysis filters with a 2band linear phase satisfies a perfect reconstruction (PR) condition and has transfer functions... 

5928311 
Method and apparatus for constructing a digital filter
A method and apparatus for constructing a digital filter from a set of data is described. The method comprises the following steps. A plurality of magnitude components of the set of data is... 

5930745 
Frontend architecture for a measurement instrument
A frontend architecture is provided for a measurement instrument having a single path for the input signal for conversion into digital samples. A signal conditioner may be coupled via a pair of... 

5926455 
Recursive filters for polyphase structures
Polyphase channelizing transmitters convert multiple signal channels into a single stream for transmission and corresponding polyphase channelizing receivers process the received stream to recover... 

5926783 
Switchable dividing network
The switchable dividing network includes two individual filters whose center frequencies are selected from the group consisting of fa /8, 3fa /8, 5fa /8 and 7fa /8. The passband of its... 

5920478 
Multiinput multioutput generic noninteracting controller
A multiinput multioutput (MIMO) controller is configured as a generic, noninteracting, multivariable controller with adaptive capabilities. The controller transforms the coupled multivariable... 

5917734 
Parallel decimator method and apparatus
A decimation device has a sampler, a memory and an adder in the decimation stage. The sampler and the adder from a partial sample for storage in the memory at a sample time. At a next sample time... 

5916301 
Sample rate conversion for synchronous variable rate
The concept of integer ratio sample rate conversion is extended to fractional values, where the exact ratio is expressed as M+N/D!/L with L being a constant. This methodology allows sample rate... 

5917733 
Pulse analysis using ordinal value filtering
An image and pulse analysis system and method including a datasieve comprising a succession of ordinal filtering means receiving at least a selected part of a signal conglomerate and filtering the... 

5912825 
Gated base line restorer system
A digital gated base line restorer system for an ionizing radiation spectroscopy device includes a gated base line restorer circuit, responsive to pulses passing through the device, for generating... 

5910904 
Digital filter apparatus
A digital filter apparatus including a pair of infinite impulse response (IIR) digital filters connected in parallel for selectively controlling an output level of an input signal fed to the... 

5909144 
Digital method and apparatus for reducing EMI emissions in digitallyclocked systems
A clock reference frequency is digitally derived from a base signal, then digitally modulated by ramping the clock reference frequency up and down about a desired frequency. The modulation occurs... 

5903857 
Method and apparatus for calibrating an analog filter in a sampled amplitude read channel
A method and apparatus for calibrating an analog equalizer in a sampled amplitude read channel is disclosed wherein the filter's frequency response is measured and calibrated directly. This is... 

5903480 
Divisionfree phaseshift for digitalaudio special effects
An audio specialeffect is created by a slow phase shift. A series of allpass digital filters are used to shift the phase of an input stream of digitalaudio samples. The amount of phase shift is... 

5900006 
Median filtering method and apparatus using a plurality of processing elements
An apparatus for median filtering a sequence of input values comprises (N+1) number of processing elements coupled in series for storing (N+1) number of input values included in a values group and... 

5896306 
Group delay correction method and apparatus
A filtering method and apparatus in which an input signal is subjected to an analog filtering step, then an analog to digital conversion step and finally a digital filtering step to produce a... 

5886913 
Method of synthesizing a finite impulse response digital filter and filter obtained by this method
A method of synthesizing a finite impulse response digital filter includes a phase of calculating the impulse response g(t) of an analog filter the transfer function of which is defined by a... 

5886912 
Processing elements connected in cascade having a controllable bypass
A plurality of processing elements are connected in cascade so as to constitute a single signal processing apparatus. The signal processing apparatus has a first path for transferring an input... 

5873063 
LSP speech synthesis device
A speech synthesis application specific integrated circuit (ASIC) based on an Line Spectrum Pair (LSP) scheme. In the ASIC, the LSP parameter is encoded and two's complement fixedpoint serial... 

5867410 
Time correction for digital filters in transient measurments
Observation of transient phenomena in an oversampled regime is implemented with a time correction obtained by prepending one or more pseudo datums to the oversampled data to constitute an... 

5867411 
Kalman filter ionospheric delay estimator
An estimator structure include a nonlinear modified Kalman filter for initial estimate and plurality of bias estimators and a parallel bank of Kalman filters for ambiguity resolution and providing... 

5864493 
Selfadapting interval mean value filter
A sensing method and system for generating an output signal indicative of an estimated mean value of an input signal is provided. A sensor samples the input signal for N (N=2, 4, 8, 16, . . . )... 

5862063 
Enhanced wavetable processing technique on a vector processor having operand routing and slot selectable operations
An apparatus and a method for massaging audio signal perform interpolation, dynamic filtering, and panning on the audio signal represented as a matrix of input values. In the interpolation... 

5856934 
Digital filter system
Constants {Pb00i, Qb00j, . . . , Pak2i, Qak2j, Pci, Qcj, Pdi, and Qdj } for calculating each of filter coefficients {ak1, ak2, b00, bk1, bk2, c and d} for a digital filter 15 by using nonlinear... 

5841911 
Method for the restoration of images disturbed by the atmosphere
A method of realtime high resolution imaging through the atmosphere is presented. This technique is based on knowledge of average atmospheric Modulation Transfer Function (MTF) at the time the... 

5842158 
Method for adaptive filtering of well logging data
The invention described herein provides for an intelligent or "adaptable" filtering method that could be applied when filtering log data. In the present invention, for a given filter model, the... 

5841821 
Bidirectional low pass filtering method and apparatus
The present invention provides a bidirectional low pass filtering method and apparatus for attenuating outofbaseband components of data transmitted from an encoder to a decoder over a... 

5841681 
Apparatus and method of filtering a signal utilizing recursion and decimation
Digital filter bank device that operates in a frequencytime hierarchically arranged, recursively fed back scheme based on the concept of decimation of a multispeedrateoperated system. The... 

5838598 
Method and apparatus for gain correction of a sigmadelta converter
Gain correction for a digital filter is accomplished by multiplying each data value by a coefficient representing the impulse response of the filter to form a convolution of the data values;... 