Matches 251 - 300 out of 326 < 1 2 3 4 5 6 7 >
Match Document Document Title
5051916 Stimulus signal generation method to maximize dynamic range in frequency response function calculations  
A method for generating a stimulus signal for conducting frequency response function calculations maximizes the overall dynamic range of the calculations possible by balancing the requirements for...
5047724 Power cable arcing fault detection system  
A system for detecting an arcing fault in a telephone central office DC power distribution conductor repeatedly measures the current flow in the distribution line, as with an inductive coupling,...
5039222 Apparatus and method for producing fourier transform spectra for a test object in fourier transform spectrographs  
Apparatus and a method for producing Fourier spectra for a test object utilizing a plurality of laser interference signals each having a period corresponding to a wavelength of a laser beam and...
5037198 Illuminant discriminator with improved boundary conditions  
The present invention is an apparatus and an associated method for determining the dominant scene illuminant which apparatus is more reliable and accurate than previous illuminant detectors. Mixed...
4990848 DTMF receiver  
A DTMF receiver (10) recognizes each of a plurality of multi-frequency tones, each tone centered on a predetermined standard frequency. Two digital bandpass filters (14, 16) each have four...
4976148 Resonant ultrasound spectrometer  
An ultrasound resonant spectrometer determines the resonant frequency spectrum of a rectangular parallelepiped sample of a high dissipation material over an expected resonant response frequency...
4975633 Spectrum analyzer having means for displaying spectrum data together with power value thereof  
A directing section substantially directs an input signal to first and second paths. A signal processing section outputs spectrum data corresponding to the input signal directed to the first path....
4890237 Method and apparatus for signal processing  
A signal processing system for a spectrum analyzer presents a three-dimensional display of a signal in the form of a display of an independent variable, such as frequency, versus a selected...
4853958 LPC-based DTMF receiver for secondary signalling  
A dual tone multi-frequency (DTMF) receiver for use in detecting digitally transmitted signals in the telephone industry. The receiver derives linear predictive coefficients for the digital signals...
4839582 Signal analyzer apparatus with automatic frequency measuring function  
In a siganl analyzer apparatus, a signal received while a local oscillator is swept in a analog manner is selected and detected by an IF circuit using a desired RBW, and the resultant data is...
4839583 Signal analyzer apparatus with analog partial sweep function  
A frequency converter converts an input signal into an intermediate frequency signal corresponding to a local oscillation signal to be analog-swept from a local oscillator. An A/D converter...
4833631 System for parameter identification of analog signals  
A system for determining the s-plane parameters, s i and r i , of the transient response, ##EQU1## of a network-under-test (NUT). A filter bank, including N serially connected filter elements, has...
4797923 Super resolving partial wave analyzer-transceiver  
Methods and electronic apparatus for recovering relatively high-resolution information from a partial wave representation of an information signal. According to the invention, there is provided a...
4719581 Signal processing unit  
A signal processing unit which employs a constant, continuous and automatic error correction. The prior manual calibration to eliminate errors is eliminated. An echo signal is employed for ease of...
4703433 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...
4689760 Digital tone decoder and method of decoding tones using linear prediction coding  
An all digital feature based pattern recognition tone detection system distinguishes one or more tones from speech or other background noise and provides extremely reliable, low cost DTMF tone...
4685065 Portable sampling spectrum analyzer  
A portable spectrum analyzer using frequency synthesis is used in the field to perform voltage amplitude measurements of specified channel segments in a multichannel configured coaxial cable...
4678990 Motor monitor signal analysis system  
A signal analysis system for a magnetic field motor monitor utilizes an analog-to-digital converter for sampling the motor magnetic field at accurately determined and equally spaced times...
4674125 Real-time hierarchal pyramid signal processing apparatus  
Pipe-line architecture is employed for analyzing in delayed real time the frequency spectrum of an information component (having one or more dimensions) of a given temporal signal having a highest...
4669880 Apparatus for converting the wavelength resolution of a spectrophotometer  
Output data from a spectrophotometer may be presented as a series of data values representative of the intensity amplitude of pass bands having equal bandwidths (resolution) and spaced at...
4660150 Spectrum analyzer with improved data analysis and display features  
An automatic spectrum analyzer is provided with enhanced features for measured data handling and analysis. One feature allows the user to establish a sequence of operations to be performed at the...
4648057 Robust iterative technique for high-resolution spatial processing and spectral estimation  
A nonlinear technique for high-resolution data processing produces high-rlution power spectra from the output of a conventional processor. First, a "guess" of the spectral estimate is formed. Then...
4626773 Method and means for determining rock properties using time-domain dielectric spectroscopy  
A method and system for measuring rock electrical properties using time-domain spectroscopy. The rock to be measured is place in direct contact with the substantially flat face of a sample cell. A...
4611164 Spectrum analyzer with automatic peak frequency tuning function  
A spectrum analyzer having an automatic tuning capability for positioning the peak level of a frequency spectrum at a predetermined position on a display device, e.g. a CRT display, with the...
4568878 Spectrum analyzers  
Spurious responses generated by operation of a spectrum analyzer are eliminated from the analyzer's display by selecting a feature of the displayed signal for testing, adjusting the analyzer...
4556067 Bandwidth indicator for Doppler blood flowmeters  
The analog broadband output signal of a medical Doppler device is sampled at a constant rate to convert the signal to digital form. The sample values are stored consecutively in a random access...
4542470 Frequency determining and lock-on system  
An apparatus for automatically determining the predominant frequency of an unknown signal occurring in a known frequency spectrum that is many times larger than the unknown signal. The system...
4542336 Method and apparatus for sampling broad band spectra in fuel quantity measurement systems  
A method and apparatus is proposed for sampling at a low rate a broad band sparse spectrum without aliasing to a specified band in which a lowest sampling frequency is found by selecting that...
4536844 Method and apparatus for simulating aural response information  
Speech and like signals are analyzed based on a model of the function of the human hearing system. The model of the inner ear is expressed as signal processing operations which map acoustic signals...
4410970 Method and apparatus for measuring and analyzing sound characteristics of record discs  
A method and apparatus for quantitatively measuring sound from a phonographic-type record disc and using such measurements to analyze the sound characteristics and to thereby improve the sound...
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...
4322806 Frequency response analyzer  
A frequency response analyzer having means for producing a phase modulated test signal for input into the system under test; means for dividing the output signal from the system under test into two...
4303979 Frequency spectrum variation monitoring system  
In a frequency spectrum variation monitoring system, the values of two parameters including the root mean square (RMS) value of each of the output signals from various detectors disposed at several...
4286326 Digital devices for spectrum analysis  
This invention relates to digital devices for spectral analysis. Signal x(t) of spectrum X(f), sampled at frequency 1/T and encoded, is processed by a temporal digital filter having a width NT...
4264958 Video processor for a spectrum analyzer  
An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency...
4257104 Apparatus for spectrum analysis of an electrical signal  
An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency...
4253152 Spectrum analyzer with parameter updating from a display marker  
An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency...
4244024 Spectrum analyzer having enterable offsets and automatic display zoom  
An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency...
4204114 Method and apparatus for comparing logic functions by acquiring signals one at a time from circuit nodes  
Techniques for displaying on a cathode ray tube a plurality of logic signals either from a single electronic circuit under test wherein the signals are acquired by a single probe, or in comparison...
4157457 Frequency analyzer comprising a digital band-pass and a digital low-pass filter section both operable in a time-division fashion  
A frequency analyzer of a predetermined number of channels comprises a digital band-pass and a digital low-pass filter section. A preselected number of digital samples sampled with a sampling...
4110834 Method and circuit arrangement for the multiplication of electrical signals  
A method for the multiplication of electrical signals comprises modulating the signals to be multiplied with functions having positive and negative values, multiplying the modulated signals...
4093989 Spectrum analyzer using digital filters  
A spectrum analyzer using digital filters for providing third octave spectrum analysis comprises means for breaking up input information into a plurality of digital data blocks, each block being of...
4084245 Arrangement for statistical signal analysis  
An arrangement for signal analysis in which the function to be examined is split into its spectral components in a filter bank. The signal values of the individual components are successively...
4031462 Frequency spectrum analyzer  
A system is disclosed for analyzing in real time the frequency spectrum of an incoming signal of unknown frequency characteristics. This is accomplished by first generating a train of sampling...
4005417 Frequency spectrum analyzer  
A frequency spectrum analyzer adapted for use in a real time signal processing radar system is disclosed. In such system a plurality of sets of radar returns, each one of such sets corresponding to...
4004464 Method and transducer and apparatus for selectively measuring oscillation components from an oscillation spectrum  
A method and apparatus for selectively measuring oscillation components and vectors in a spectrum, particularly produced by detecting unbalance of a rotary body, with a transducer which includes a...
3988667 Noise source for transfer function testing  
A method and apparatus for obtaining an accurate measure of a transfer function of either a linear or the linear part of a nonlinear system. This is accomplished by utilizing an estimation...
3983379 Random sample statistical function analyzer  
High bandwidth stationary ergodic signals are randomly sampled upon command of a computer by a pair of high speed sample-and-hold circuits with a variable digital delay as determined by the...
3935437 Signal processor  
A signal processor enables the examination of the spectral content of an input signal within a selected analysis bandwidth f a about an adjustable reference frequency f r . A multi-segment digital...
3932737 Spectrum analyzer establishing a nonlinear frequency distribution of power-density spectra  
Precalculated samples of a power-density spectrum, taken at equispaced frequencies, are converted into modified samples with a nonlinear (e.g. logarithmic) distribution by being selectively...
Matches 251 - 300 out of 326 < 1 2 3 4 5 6 7 >