Class 708/310 - Coherent

Subclass of Class 708 - Electrical computers: arithmetic processing and calculating
Definition: Subject matter where a particular frequency is eliminated
No. of patents: 27
Last issue date: 09/04/2007

Number	Title	Issue Date
7265932	Repetitive controller having reduced memory elements A repetitive controller for suppressing periodic signals with half-wave symmetry includes a memory loop fed with a periodic signal of period NT and in which the memory size includes N/2 memory elements. A negative feedback connection is provided and a factor of −�...	09/04/2007
7256645	Suppression of noise in an integrated circuit Sub-circuits of an integrated circuit can act as noise sources on common conductors such as power supply lines and the substrate. Each of these conductors may act as a noise medium capable of transferring noise signals from the noise source to other sub-circuits. On...	08/14/2007
7084641	Measuring cell and measuring field comprising measuring cells of this type, use of a measuring and use of a measuring field A measuring cell for recording an electrical potential of an analyte situated on the measuring cell. The measuring cell has a sensor, a layer arranged above the sensor and electrically insulating the analyte from the sensor, and an amplifier circuit connected to the...	08/01/2006
7027535	Frequency tracking loop and method of frequency tracking A frequency tracking loop (100) includes: a mixer (122) for correcting frequency offset of an input radio signal that includes bursts of known data; a frequency offset estimator (134), for providing an estimate of frequency offset; a variable ba...	04/11/2006
6998905	Noise cancellation circuits and methods Circuits and methods for coherent noise cancellation are provided. More specifically, circuits and methods are provided for coherent cancellation of noise that is present in a data signal due to noise being present in the source signal (e.g., an optical signal) that...	02/14/2006
6904443	Harmonic-series filter In a filtering system, a first input receives a signal contaminated with noise. A second input receives a noise reference signal. Each notch filter in a set of M notch filters is responsive to a corresponding tuning coefficient so as to attenuate a corresponding noi...	06/07/2005
5740090	Filter, repetitive control system and learning control system both provided with such filter Repetitive control systems and learning control systems using filters composed of delay circuits and having parameters resulting in a very high loop gain for only specific frequencies. The result of this is a substantial reduction of periodic disturbances...	04/14/1998
5680337	Coherence optimized active adaptive control system Coherence optimization is provided in an active adaptive control system. The adaptive control model (16) has a model input (18) receiving a reference signal (8) from a reference input transducer (4), an error input (20) receiving an error signal (14) from...	10/21/1997
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, nonlinearities, and the like. The present method filters the ...	03/11/1997
5581495	Adaptive signal processing array with unconstrained pole-zero rejection of coherent and non-coherent interfering signals Broadband coherent and incoherent interfering signals (jammers) are suppressed by using differencing and summing operations in an adaptive signal processing array composed of a plurality of signal detectors. A number of variable weight adaptive filters, e...	12/03/1996
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 decomposes a input signal into a noise-free part called basic ...	05/28/1996
5442593	Apparatus and method of nulling discrete frequency noise signals The present invention relates to a signal processing system for generating a nulling signal for attenuating a periodic noise component from an information signal. According to one aspect of the invention, the system includes two nested feedback networks. ...	08/15/1995
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 windows are realized using infinite impulse response filters. I...	12/13/1994
5323339	Digital anti-aliasing filter system A digital preprocessor anti-aliasing filter system for digitally processing input data from a sensor and feeding this processed input data to a primary processor. An analog-to-digital converter is provided for sampling analog input data and converting thi...	06/21/1994
5321643	Digital comb filter A digital comb filter includes a period measurement circuit, a subtracter, a first adder, a first memory and a first multiplier. The period measurement circuit outputs difference signals representing differences between periods of target and input pulses....	06/14/1994
5265042	Device and method for a nonlinear comb filter This invention describes a nonlinear comb filter device and a method for removing harmonic interference from a corrupted signal. Here, a corrupted signal is defined as a signal containing an impulsive signal and harmonic interference. The corrupted signal...	11/23/1993
5165051	Modified fast frequency acquisition via adaptive least squares algorithm This is a method and associated apparatus for accurately and quickly estimating the amplitude, frequency and phase of a signal of interest. The method comprises the steps of, inputting the signal of interest; generating a reference signal with adjustable ...	11/17/1992
4947360	Low frequency digital notch filter A low frequency digital notch filter comprising two sub-filters - an all-pass-network filter (1) and a T-section filter (3) with a feedback connection from the T-filter to an input node (31), and feed forward connection from this input node to a terminal ...	08/07/1990
4941185	Image processing A method and apparatus for processing a first (e.g. half-tone) image constituted by a second (e.g. continuous tone) image convolved with a periodic (screen) function, to produce the second image is described. The invention is particularly suited to handli...	07/10/1990
4941117	Multiple channel adaptive correlation/decorrelation processor Signals arriving from N channels are processed by an array of two-input, two-output decorrelation processors to produce N output channels in which the signals from each of the input channels are decorrelated from all of the other channels. The array of pr...	07/10/1990
4829464	Arrangement for filtering a multiplexed video signal Arrangement for cancelling spurious signals inherent to a multiplexed video signal, comprising an arrangement of random access memories ("1"), ("2"), and ("3") and adders (AD1, 2 and 3) and having for its object to obtain by a digital signal processing op...	05/09/1989
4797807	Multiple channel fast orthogonalization network A method for orthogonalizing inputs with respect to each other. The method omprises the steps of: generating a root structure of N inputs having input order 1 to N, where 2m-1	01/10/1989
4679001	Adaptive stop-notch filter A filter suppresses energy at time varying or ensemble varying frequencies. The filter comprises multiplier sections having sets of values which are dynamically varied during the receipt of time varying or ensemble varying energy. The variation of the val...	07/07/1987
4468794	Digital coherent detector A digital coherent detector for sampling a band-limited IF signal directly o obtain its in-phase and quadrature coefficients I(t) and Q(t) without using quadrature channels comprising: an A/D converter for sampling and digitizing an IF signal r(t)=I(t) cos ...	08/28/1984
4420815	Apparatus and method for removal of sinusoidal noise from a sampled signal An apparatus and method for removing signal frequency sinusoidal noise from an analog signal is disclosed. The filter apparatus utilizes A Programmable Gain Amplifier (PGA) as an input to a discrete sine wave generator to control the amplitude and phase o...	12/13/1983
4344150	Coherent noise cancelling filter Apparatus and method for removing coherent noise from an electrical signal, such as powerline noise, and operating in real time. An operational amplifier with digital filter and a low pass filter in the feedback loop, with the digital filter providing a f...	08/10/1982
4106102	Self-adaptive digital filter for noise and phase jitter reduction A new adaptive digital tuning filter for tracking a sinusoidal signal within a frequency band is described. The input signal representative of both said sinusoidal signal and noise is fed to a Hilbert transformer which provides the in-phase and quadrature...	08/08/1978

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Class 708/310 - Coherent