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5625581 Non-integral delay circuit  
A time-discrete signal is delayed by a selectable fraction (δ) of a sampling period of the time-discrete signal. First (F1) and second (F2) differential signals having mutually different phase...
5621474 Filter working on image digital signals for video appliances  
A filter acting on digital image signals for apparatus of the video type includes at least first and second processing units adapted to elect an image edge, each processing unit includes an...
5612978 Method and apparatus for real-time adaptive interference cancellation in dynamic environments  
A finite impulse response filter performs an FFT on a signal, multiplies it by a transfer function in the frequency domain, and then performs an inverse FFT. The transfer function is dynamically...
5610848 Robust resonance reduction using staggered posicast filters  
A method for filtering actuator commands for a satellite control system to reduce resonant mode excitation despite uncertain knowledge of the resonance frequencies, due to parameter variations,...
5608665 Self-tuned, continuous-time active filter  
A self-tuned, continuous-time active filter receives a differential input signal and generates a differential output signal. The filter consists of cascaded first-order and second-order tunable...
5608662 Packet filter engine  
A data processor is connected to a digital communication system such that information packets broadcast on the system are examined to determine if the contents of each packet meet selection...
5600582 Programmable horizontal line filter implemented with synchronous vector processor  
A synchronous vector processor (SVP) (30) is provided to realize a horizontal decimation filter by processing in input value through a plurality of parallel processing elements (40). A plurality...
5594676 Digital image warping system  
A system is provided for performing real-time warping in one or two dimensions (eg. dynamic zoom and shrink in both horizontal and vertical directions), and temporal warping of image frames (eg....
5592403 Digital-to-analog converter including integral digital audio filter  
A digital signal processor (DSP) circuit is configured to recursively retrieve and process pairs of data points in a symmetric digital filter. The data points are retrieved from an external source...
5581493 Device for filtering positive dejustification jitter of a digital bit stream and application thereof to filtering positive and positive-negative dejustification jitter of a digital bit stream  
A device for filtering positive dejustification jitter of a digital bit stream includes a phase-locked loop for slaving the timing of a signal representative of the read timing of a buffer memory...
5579243 Modal parameter estimation for stable filters  
A filter synthesizer and method are disclosed for generating and outputting a stable filter from frequency response data, including coherence values. A processing unit has a processor, memory, and...
5574639 System and method for constructing filters for detecting signals whose frequency content varies with time  
A system and method for constructing a bank of filters which detect the presence of signals whose frequency content varies with time. The present invention includes a novel system and method for...
5572558 PID loop filter for timing recovery in a sampled amplitude read channel  
A PID filter employed in a timing recovery phase-locked loop (PLL) for synchronizing the sampling of a read signal from a magnetic read head in a sampled amplitude read channel for magnetic...
5559905 Digital image resizing apparatus  
In an apparatus for resizing an image, comprising interpolation filter means for receiving a stream of input pixels having a predetermined sampling period P and a first sampling rate of S...
5555515 Apparatus and method for generating linearly filtered composite signal  
An apparatus and method for generating a linearly filtered composite signal, wherein the original signal of said composite signal can be divided into a plurality of sequentially arranged original...
5553103 Circuit including a subtractor, an adder, and first and second clocked registers connected in series  
A digital filter circuit includes a first input for samples of a digital signal, a subtractor, an adder and a first clocked register connected in series. The first input of the circuit is...
5548541 Finite impulse response filter for modulator in digital data transmission system  
A finite impulse response (FIR) filter is provided for shaping a one bit serial digital data pulse train in a digital data transmission system. The filter comprises (i) a delay element for...
5544199 Non-adaptive phase-difference interference filter  
An interference suppression system utilizes a non-adaptive filter to suppress interference from bandspread communication signals. The filter is effective in the cancellation of interference from a...
5541953 Data transmission method and apparatus for use in low BW:Rs applications  
A data transmission scheme for use in a low channel bandwidth-to-modulation symbol rate ratio (BW:RS) application employing a linear modulator for producing in-phase and quadrature (I and Q)...
5530660 Digital band pass elliptic filter system  
The filter coefficients of a digital band pass elliptic filter can be approximated to a linear function of the center frequency of the pass band width. The filter coefficients of a band pass...
5521851 Noise reduction method and apparatus  
A method and apparatus is disclosed to reduce noise which overlaps detected signals in a common frequency band for detection of distributed signals from multiple measurement points. The method...
5511014 Method for determining the transmittance of a filter circuit adapted to transform the impulse response of a filter into a minimal phase response and filter implementing this method  
A method for determining the transmittance of a filter circuit adapted to transform the impulse response of a filter into a minimal phase response entails computing the theoretical frequency...
5502663 Digital filter having independent damping and frequency parameters  
A filter capable of having its damping and frequency parameters independently varied. The filter can be represented in either a digital or an analog computation network. The network comprises four...
5500810 Filter device with memory test circuit  
A filter device with memory test circuit easily executes a memory test inspite of single-bit data processing to 1 bit data. The filter device with a memory test circuit includes a memory test...
5488576 Amplitude adaptive filter  
A digital filter transfer function is implemented using at least two implementing filters, one of which has a transfer function which guarantees an output which is unconditionally within a...
5485393 Method and apparatus for measuring electrical parameters using a differentiating current sensor and a digital integrator  
A digital current meter, usable either alone or in combination with a voltage meter, is disclosed. The current meter includes a current sensor which outputs the time derivative of the current...
5483474 D-dimensional, fractional bandwidth signal processing apparatus  
Filtering apparatus responsive to a sequence of samples of an input signal that is digitally-sampled at a given frequency, wherein the input signal defines information having at least one...
5479922 Bidirectional filter  
A system for filtering stochastic signals as embodied in stress test systems for measuring electrocardiographic (ECG) activity in response to exercise employs a bidirectional Infinite Impulse...
5471411 Interpolation filter with reduced set of filter coefficients  
An asynchronous digital sample rate converter includes a random access memory for storing input data values and a read only memory for storing a reduced set of interpolation filter coefficients....
5450339 Noncanonic fully systolic LMS adaptive architecture  
A noncanonic fully systolic least mean squares adaptive filter architecture encompasses both tap weight updates and filtering and allows cascadability without penalties in speed or accuracy. A...
5444639 Angular rate sensing system and method, with digital synthesizer and variable-frequency oscillator  
For use with a quartz angular rate sensor, a frequency and phase-locked synthesizer recovers a reference signal virtually free of phase noise, and generates a quadrature-phase reference signal for...
5440503 Digital filtering circuit operable as a three-stage moving average filter  
In a digital filtering circuit for converting an input data signal (a) of a sampling frequency fs into an output data signal (OUT) of an oversampling frequency Nfs which is N times the sampling...
5432723 Parallel infinite impulse response (IIR) filter with low quantization effects and method therefor  
A parallel IIR filter (100) has low quantization effects and includes a multiplier (103) which multiplies a digital input signal by a constant, and an arbitrary number of biquad filters (104,...
5428563 Function generator whose output attains to desired value at designated time  
A function generator whose output attains to a desired value at a designated time and in the course of attainment, the desired value and/or designated time can be varied as desired. Therefore, the...
5412590 Appliance temperature sensor having noise filtering  
An appliance temperature sensor for acquisition of usable data in a noisy environment collects a plurality of temperature readings in a buffer. It then screens that batch of data to determine...
5410499 Phase shifter for directly sampled bandpass signals  
A phase shifter for shifting the phase of directly sampled bandpass signals ithout having to convert to complex (I,Q) form is disclosed. An application requiring a plurality of appropriately phase...
5410621 Image processing system having a sampled filter  
A filter display system is provided to improve display operations. Filtering of display information, such as with correlation filters, improves the image and enhances events of interest. High...
5404322 Digital filter and method of design  
A digital filter is designed by characterizing a desired filter passband in the frequency domain, transforming this representation into the time domain, selecting weighting coefficients at...
5402452 Incremental phase smoothing desynchronizer and calculation apparatus  
A desynchronizer (20) for desynchronizing data stored within synchronous payload envelopes of a synchronous communication protocol such as SONET (Synchronous Optical Network), provides for...
5396657 Selectable filter for reducing Gaussian noise, co-channel and adjacent channel interference in a radio-telephone receiver  
The invention relates to an adjustable filter comprising means for analysing the received signal which identifies the type of interference signal present from a predetermined set of interference...
5396489 Method and means for transmultiplexing signals between signal terminals and radio frequency channels  
A method and apparatus are provided of transmultiplexing a plurality of signals between a plurality of signal terminals (17 or 29) and a plurality of selected radio frequency channels. The method...
5388062 Reconfigurable programmable digital filter architecture useful in communication receiver  
A VLSI integrated circuit, which comprises a single IIR input and global section and identically-structured cascadable filter sections, each of which filter sections includes a pair of...
5379242 ROM filter  
A ROM filter includes a number of ROMs, each of which is programmed to hold data relating to several pulse response curves during only a particular time interval. As data are read into the filter,...
5373460 Method and apparatus for generating sliding tapered windows and sliding window transforms  
A method and apparatus for the computation of sliding windows and sliding window Fourier transforms and spectrograms requiring fewer operations in comparison with the current art. The sliding...
5367475 Moving vehicle classifier with iterative deconvolver estimator  
A MOVING VEHICLE CLASSIFIER WITH ITERATIVE DECONVOLVER ESTIMATOR deconvolves a signal in which a plurality of sensed signals, which originate from a common signal source (namely, a moving vehicle)...
5351205 Method for filtering digital signals which varies the filter length  
Digital signals V(K), for use in numerical control of machine tools or robots, for example, are smoothed by means of digital filters to avoid sudden load changes on the axes. As a result,...
5347478 Method of and device for compressing and reproducing waveform data  
To waveform data is applied not only a predetermined data compression processing but also a processing for further reducing the value of waveform data in accordance with a weight coefficient,...
5345406 Bandpass sigma delta converter suitable for multiple protocols  
Improved integration and simplified construction of direct conversion receivers is achieved by providing selectivity in the early stages of a sigma delta converter to reject adjacent channel...
5345407 Digital multiband filter and method thereof  
A digital multiband filter separates luma data and chroma data from a digitized composite video signal. A multiband filter receives a digital composite video input signal and provides a low-pass...
5343420 Signal discrimination circuit  
A signal discrimination circuit is provided with: a prediction circuit for releasing a prediction signal that is formed by making a linear prediction based on a previous input signal; a...