Matches 201 - 250 out of 271 < 1 2 3 4 5 6 >
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5652715 Methods for reducing noise in an electrical signal  
Methods for determining optical properties of an optical waveguide fiber using an optical time domain reflectometer (OTDR) are provided. The methods involve the removal of noise from an OTDR trace...
5631855 Methods and apparatus for analyzing physical quantities and apparatus for reducing line spectrum noise  
Operations of physical formula which is determined its main portion based upon physical quantities, are performed by plural physical formula operating units (11)(12) . . . (1m) based upon known...
5586065 Method and apparatus for minimizing aircraft cabin noise  
Aircraft cabin noise and engine vibration are monitored at selected cabin and engine locations (51a/51b), respectively. An optimizing equation uses aircraft cabin noise information to separately...
5586042 Apparatus and methods for measuring and detecting variations in the value of a capacitor  
A new and improved method for measuring the value of a capacitor and for detecting small variations in the value of a capacitor around a reference value is described. In accordance with the...
5581490 Contact management model assessment system for contact tracking in the presence of model uncertainty and noise  
A system for providing an iterative method of assessing accuracy of selected models of physical phenomena and for determining selection of alternate models in response to a data sequence in the...
5574665 Receiver apparatus and method for frequency tagging  
The present invention is a system and method for resolving closely spaced frequencies in frequency patterns used to tag objects. The system comprises a base station transceiver and one or more...
5559719 Digitally controlled circuit interrupter with improved automatic selection of sampling interval for 50 Hz and 60 Hz power systems  
A circuit interrupter with a digital trip unit automatically sets the sampling interval appropriate for the 50 Hz or 60 Hz distribution system to which the interrupter is connected. In order to...
5550840 Noise suppression in large three state busses during test  
A method for suppressing noise encountered during testing of large semiconductor chips is disclosed herein. Output drivers on the semiconductor chip may occasionally produce errant signals during...
5537334 Process for processing signals collected by an eddy current absolute point transducer  
A system for the processing of signals collected by an eddy current absolute point transducer moving along an inner surface of a conductive material tube and supplying a representative signal...
5532603 Cross-talk measurement apparatus with near-end compensation  
A pulse-based cable crosstalk measurement instrument provides near-end cross talk (NEXT) information for characterizing the performance of local area network (LAN) cable systems. Accuracy of the...
5528555 System and method for compensating for towed array motion induced errors  
A system for compensating for noise induced in a sensor data stream from a sensor array towed by a towing device includes a towing device motion data input receives a towed motion data stream...
5511009 Energy-based process for the detection of signals drowned in noise  
The energy-based process according to the invention for the detection of useful signals drowned in noise consists of starting from a frame of samples of a noisy signal grouped in successive frames,...
5511010 Method and apparatus of eliminating interference in an undersettled electrical signal  
The present invention includes a method of eliminating interference from an undersettled electrical signal, the undersettled electrical signal including a test signal at a known frequency. One...
5490091 Histograms of processed noise samples for measuring error rate of a PRML data detection channel  
A method and apparatus for measuring the error rate of a magnetic recording device, such as a hard disk storing a set of data. The apparatus has a partial response maximum likelihood data detecting...
5481503 Apparatus for and method of adaptively processing sonar data  
The invention discloses an apparatus for and a method of adaptively processing a sonar power spectrum for improving the display of narrowband line structure characteristic of a target in a...
5451852 Control system having signal tracking window filters  
A control system having a source of control signals and a multi-window electrical signal tracking filter. The signal tracking filter includes an operational amplifier operating in the non-inverting...
5418720 Symbol width measurement system  
A symbol width measurement system for detecting and analyzing the effects of ground offset voltages and signal noise on J1850 symbol widths appearing on a multi-node multiplexed data communications...
5396414 Adaptive noise cancellation  
A compensator that enables an adaptive filter to be placed within a closed loop control system so as to reduce the effects of both measurable and unmeasurable disturbances on the output of the...
5321365 Reduced noise sensitivity in inverse scattering through filtering  
An inverse scattering processing method with enhanced noise immunity and resolution capabilities for use in modeling multi-layer acoustic, electromagnetic or other propagating media. A time bounded...
5289194 Combiner for two dimensional adaptive interference suppression system  
A multisignal combiner is provided for weighting the best performing signal of an amplitude transform signal and a phase difference transform signal produced by a processor which receives a two...
5221185 Method and apparatus for synchronizing rotating machinery to reduce noise  
A system for reducing noise created by multiple rotating machines by synchronizing the machines so as to establish a phase relationship between the machines which minimizes the noise. One or more...
5161113 CCD output signal processing method and apparatus  
A CCD output signal processing method includes the steps of sampling a CCD output signal supplied from a CCD in synchronism with a transfer clock to thereby generate sampled CCD output data within...
5131011 Receiver for data transmission system with nonlinearities  
Non-linear intersymbol interference and noise in a received data signal are corrected through use of a Viterbi detector which estimates the most likely sequence of transmitted data symbols by...
5097158 Digital noise feedthrough reducer and synchronizer for mixed-signal integrated circuit  
A solution to the problem of analog decision making in a "mixed-signal" integrated circuit removes pulses of the local clock from the analog decision trigger whenever chip select is active, thereby...
H001005 Gram-Schmidt space-time adaptive filter using transverse orthonormal ladder filters  
A space-time adaptive filter system is provided for eliminating unwanted signals from a radar or communication system. The filter system receives a main channel and several auxiliary channels...
5070462 Device for locating a boring machine  
An assembly is disclosed herein for locating an underground object that is transmitting a relatively low frequency signal electromagentic field. Means are provided for scanning the earth's surface...
5033015 Automated system for testing an imaging sensor  
An automated system for testing imaging sensors 10 is disclosed. The automated system 10 provides an accurate and repeatable method for testing imaging sensors. The automated system 10 includes an...
5029481 Cross-correlation apparatus and methods  
An apparatus and method for processing first and second signals, the second signal representing information which is delayed in time with respect to correspoonding information represented by the...
5007007 Circuitry for converting a measurement signal disturbed by a disturbance function into an undisturbed signal  
Circuitry is disclosed for converting an input measurement signal V R (i), which is disturbed at least occasionally by a disturbance function, into an output, undisturbed signal V R (o) by means of...
4890248 Method and apparatus for reducing aliasing in signal processing  
A method and apparatus for reducing the introduction of alias frequencies in the processing of signals. A sequence of jittered pulses is provided, each pulse occurring during one of a sequence of...
4791672 Wearable digital hearing aid and method for improving hearing ability  
A hearing aid to be worn by an individual of impaired hearing ability producing analog output signals of improved intelligibility. The hearing aid includes a wearable, programmable digital signal...
4719466 Adaptive radar signal processor for the detection of useful echo and the cancellation of clutter  
Adaptive radar signal processor apt to detect the useful echo in the presence of an additive disturbance made up of clutter and noise, through which the disturbance can be cancelled and the useful...
4718028 Extremely high speed, real-time background filter for radiation detectors  
A five stage background filter circuit 10 is disclosed which is capable of responding to background radiation changes at speeds which are from one to two orders of magnitude faster than...
4669051 Vector network analyzer with integral processor  
A precision vector network analyzer which is suitable for a wide range of applications including both laboratory and automated production measurements and testing is disclosed. New measurement...
4665499 Averaging method for periodic strays elimination and a counting circuit for evoked responses measuring set-up for applying the method  
An averaging method for elimination of periodic stray signals, such as stray signals originating ain an environment (2) comprising a main signal source, which method is employed in a system for...
4530076 Frequency domain non-linear signal processing apparatus and method for discrimination against non-Gaussian interference  
Apparatus and method for discriminating against non-Gaussian noise. Analog signals from an array of sensors are converted to real and imaginary digital representations and processed such that...
4503545 System for evaluating transmission line impairments  
A data communication system which includes a transmitter and a receiver is used in QAM or PSK modulation. The receiver provides a signal space pattern wherein each point is defined in a coordinate...
4482957 Use of a square root amplifier for statistics limited data  
An analog signal having a quantum noise component undergoes conversion by a square root amplifier. The converted signal then undergoes analog-to-digital conversion resulting in a digital output...
4417310 Apparatus for measuring distortion factor  
An apparatus for measuring a distortion factor of an analog input signal comprises a frequency multiplier for producing a sampling signal having a frequency of the input signal multiplied by N, an...
4394743 Tone generation method and apparatus using stored reference calibration coefficients  
A tone generator operates in a multiplicative (19) manner with respect to a reference signal (20) for providing a selectable sequence of tones. A digital calibration coefficient is constructed for...
4384331 Noise suppressor for vehicle digital system  
A noise suppressor is disclosed for an automotive vehicle control system including a digital computer and a power unit for supplying power to the digital computer. The noise suppressor comprises an...
4363006 Noise reduction system having series connected variable frequency filters  
A noise reduction system having a compressor and an expander. The compressor comprises series connected high and low frequency band filters of the variable frequency type, the cut-off frequencies...
4363138 Signal presence detector and method  
Circuitry and methods are presented for detecting the presence of a spectrally distributed signal having a known distribution, e.g. spread spectrum, in a strong noise environment. The signal is...
4325068 Loran-C signal processor  
A Loran-C receiver signal processor is disclosed which processes radio frequency Loran-C signal pulses on a point-by-point, cycle-by-cycle basis to provide the ability to locate on each pulse a...
4319334 Frequency sensing device for reducing non-periodic components  
A device for sensing the frequency of an alternating electrical input signal. An autocorrelator at an input to the device generates a signal having a periodic component of frequency equal to four...
4311044 Tire sidewall bump/depression detection system  
A system is disclosed for detecting potential defects as evidenced by surface irregularities in the sidewalls of a tire to be tested. A test is performed on a "uniformity machine" programmed to run...
4255791 Signal processing system  
An adaptive array signal processing system employs a correlation discriminant operator or signal recognizer. The operation of the signal recognizer is dependent upon noise decorrelation rather than...
4231094 Method and device for determining the phase intercept in a system employing phase-shift keying modulation  
A method and device for measuring the slope of the envelope delay characteristic of a transmission channel and deriving the phase intercept value therefrom. A measurment signal having a frequency...
4213184 Signal processor for processing ultrasonic receiver signals  
A signal processor is provided which uses an analog integrating circuit in conjunction with a set of digital counters controlled by a precision clock for sampling timing to provide an improved...
4194183 Apparatus for electrically converting an analog signal into a digital representation  
A method is described for electrically converting an analog signal into a digital representation in a manner that maximizes noise rejection. The digital representation is formed from a preselected...
Matches 201 - 250 out of 271 < 1 2 3 4 5 6 >