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6817017 |
Universal interface system
This invention provides a universal interface system that is capable of launching software applications across operating system platforms. For example, the universal interface system allows a...
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6295547 |
Fourier transform apparatus
A Fourier transform apparatus includes: a signal generating section for generating a plurality of sine-wave signals and a plurality of cosine-wave signals; a plurality of analog circuits each...
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6094499 |
Pattern collation apparatus
A pattern collation apparatus is designed to identify a registration pattern and a collation pattern as identical patterns or not even with a rotation offset between the registration pattern and...
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5959875 |
Analog signal characterizer for functional transformation
A signal characterizer for performing functional transformations such as Fast Fourier Transforms (FFTs), which converts an input serial analog signal into a plurality of parallel discrete signals...
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5952685 |
Signal processing applications of massively parallel charge domain computing devices
The present invention is embodied in a charge coupled device (CCD)/charge injection device (CID) architecture capable of performing a Fourier transform by simultaneous matrix vector multiplication...
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5862070 |
Discrete cosine transformation circuit
A high-speed discrete cosine transformation circuit includes the one-dimensional input signals x(0) to x(7) being input in parallel to the positive input terminals "+" or the negative input...
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5587829 |
Method and apparatus for signal filtering
A signal filter, and method of signal filtering, in which an optical signal s spatially dispersed according to frequency, and undesired frequencies blocked out. In an embodiment, a Bragg cell...
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5523881 |
Optical correlator using light phase modulation and two reflective spatial light modulators
An optical signal processor which employs a coherent light source, two spatial light modulators and a beam splitter. Light is from the source is reflected from the beam splitter and sent to a first...
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5481183 |
Electro-optic spectrum analyzer
A broadband spectrum analyzer for radio frequency and microwave signals. The signal to be analyzed modulates an optical laser beam through an electro-optic modulator. The resultant modulated beam...
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5317524 |
Spectral signal analyzer system
A process for analyzing a spectral signal generated by a birefringent element and transmitted to an array. An output spectral signal emanating from the array is converted from an analog to a...
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5267188 |
Multi-channel acousto-optic spectrum analyzer
A multi-channel acousto-optic spectrometer employs a multi-channel Bragg cell, Fourier transform imaging optics and two-dimensional charge coupled device photodetector array to simultaneously...
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5235439 |
Volume-holographic inner product processor
A pattern recognition apparatus and a method for operating same. The apparatus includes a volume holographic medium (4) having a plurality of Fourier-space volume holograms representing pattern...
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5167002 |
Electric motor driver control
An apparatus and method for reducing synchronous speed variations in an electric motor having a rotating shaft, comprises a speed transducer for generating a continuous analog speed signal...
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5161204 |
Apparatus for generating a feature matrix based on normalized out-class and in-class variation matrices
A method and apparatus under software control for pattern recognition utilizes a neural network implementation to recognize two dimensional input images which are sufficiently similar to a database...
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5136532 |
Coherent signal processing device using an optical delay line and application thereof to filtering correlation product and spectral analysis
A coherent signal processing device is provided using a monomode optical fiber as delay line, comprising a source and a ring interferometer with a bidirectional coupler and a monomode optical fiber...
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5105380 |
Electro-optic channelized modulator and receiver
A wideband electrical input signal is applied to a tapped delay line to produce a spatial representation of the input signal distributed along the delay line taps. Inputs of individual elements of...
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5079735 |
High-dynamic-range compressive receiver
A compressive receiver (10) includes a modulation circuit (14) that modulates the receiver input signal with compensation values equal to the ratio of the transfer function of an ideal linear...
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5073807 |
Method and apparatus for achieving multiple acoustic charge transport device input contacts
A bipolar injector structure, similar to a common-base amplifier circuit, is described for use as a unidirectional injector of charge for a charge-transfer device input circuit. This injector...
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5073006 |
Compact 2f optical correlator
A 2f Fourier transform optical correlator uses two simple, single element lenses, with the second lens performing both quadratic phase term removal and the inverse Fourier transform operation in a...
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5058049 |
Complex signal transformation using a resistive network
A resistive network is responsive to a spatial vector formed by sampling an input signal for providing the simultaneous complex transformation thereof at a plurality of outputs. A matrix...
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5054913 |
Method and apparatus for measuring the velocity of a fluid using analysis of Young's fringes in speckle photography
A method and apparatus for measuring the velocity of a fluid in which a double-exposure image of the speckle pattern or particle images of tracer particle in a fluid is irradiated with a collimated...
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5028102 |
Parallel optical information processing system
A parallel optical information processing system includes an information inputting part which produces a coherent optical beam spatially modulated by input image information. A rewritable hologram...
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5020018 |
Outer product optical interferometer with hologram
An outer product shearing interferometer for an optical source of one-dimensional extent which provides interference between every two points on the source. The interferometer comprises an input...
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5012440 |
Outer product optical interferometer with mask
An outer product shearing interferometer for an optical source of one-dimensional extent which provides simultaneous interference between every two points on the source. The interferometer...
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4995006 |
Apparatus and method for low-pass equivalent processing
Low pass equivalent processing is a method for use with a network analyzer, that gethers a sequence of NDATA samples, each sample including real and imaginary components of a signal, over a...
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4931959 |
Optical shuffle arrangement
An optical arrangement permutes elements of a multi-dimensional array by projecting an input element array onto an output via a plurality of optical paths. Each optical path provides a relative...
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4884867 |
Cascaded optical notching system
The invention features an optical system for removing electromagnetic interference components from a radio frequency signal. The radio frequency signal is electrically cascaded through a series of...
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4871232 |
Method and apparatus for ultra high frequency spectrum analysis
A high frequency spectral analysis system and method operates by modulating an optical beam with a high frequency signal to be analyzed, and sampling the beam simultaneously at periodically spaced...
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4839894 |
Contiguous channel multiplexer/demultiplexer
A multiplexer/demultiplexer for combining/separating a large number of contiguous frequency channels in microwave bands while incurring low insertion loss. The invention, in a demultiplexer mode,...
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4764891 |
Programmable methods of performing complex optical computations using data processing system
Methods of performing complex optical computations, preferably using a programmable optical data processor having a plurality of spatial light modulators to impress data onto a data beam. Data can...
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4729114 |
Signal processing circuit for instantaneous fourier transformation
A feedback loop circuit that may be used for Fourier Transform analysis, for carrier acquisition, or for other related purposes, sums the inputs signal, passes it through a delay line to provide an...
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4701762 |
Three-dimensional electromagnetic surveillance system and method
A surveillance system for simultaneously identifying the directions and frequencies of a plurality of electromagnetic-radiation sources includes an irregular array (10) of antenna elements and...
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4672641 |
Surface acoustic wave device for data rate reduction
A surface acoustic wave (SAW) device, and corresponding method, for expanding or contracting the time scale of an input signal that varies in time but is limited to a predetermined time interval....
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4654667 |
Signal-acquisition system for a circular array
A signal-acquisition system (10) for a circular antenna array (12) includes a two-dimensional compressive receiver (18) that performs a two-dimensional Fourier transformation in time and position...
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4641143 |
Two-dimensional acquisition system using circular array
A frequency-and-direction-finding system (10) employing a circular array (12) performs a two-dimensional Fourier transformation in space and time on the signals from the individual elements. The...
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4633257 |
Acquisition system employing circular array
A system for indicating the direction of a source of radio waves received by a circular antenna array (12) includes a Butler matrix (18) that receives the array outputs and feeds the resultant...
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4556950 |
Incoherent optical processor
An optical signal processor operating on interferometric principles serves to perform real time Fourier transformations on the intensity distribution of one-dimensional incoherent input light sources.
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4542367 |
Optical digital to analog converter
Method and apparatus for conversion of digital multistate signals, represing a numerical value, to an optical output signal having an amplitude analogous to the numerical value. A controllable...
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4532603 |
Chirp transform correlator
A chirp transform correlator having asynchronous operation is made possible by the use of a pair of paralleled signal processing channels to which the unknown signal to be correlated is applied....
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4531197 |
Real-time Fourier transformer using one acousto-optical cell
An optical Fourier transformer comprising an acousto-optical cell such as a Bragg cell upon which is impressed a chirp signal, a laser which is modulated by the signal to be analyzed, optical means...
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4479229 |
Arrangement for and method of detecting multi-frequency sound code signals
A multi-frequency signal receiver for use in telephony signalling systems comprises a plurality of frequency selective circuits whose outputs are connected to a signal combination detector which...
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4471445 |
Fourier transform signal processor
A hybrid opto-electronic method and apparatus for Fourier transform measurements of temporal signals are disclosed. The magnitude and phase of the signal transform are system outputs. High...
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4365310 |
Optical homodyne processor
An analog optical processor which performs complex transform operations or omplex correlations to yield quantitative (numerical) output. This is accomplished on data points which are used as inputs...
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4329651 |
Chirp filters/signals
A discrete chirp generator produces discrete chirp signals which correspond o either of two exponential functions, namely the functions exp [jπ(m 2 +α)/N] or exp (jπ[m(m+β)+α]/N), where m=0,...
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4282579 |
Discrete Fourier transform system using the dual chirp-Z transform
A transform system provides a real-time implementation of the discrete Foer transform (DFT) of length N, the system being useful in sonar and radar signal processing. The input signal g n ,...
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4275454 |
Optical system phase error compensator
A method for compensating for phase errors in an optical data processing system for performing a Fourier transformation analysis of a data source. The aberrations of the system are holographically...
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4179586 |
System of encoded speech transmission and reception
A system for the secure transmission and reception of information which uizes pseudo values of phase and amplitude of speech signals, which are related to the original values by specific...
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4161785 |
Matrix multiplier
A matrix multiplier is described for multiplying sampled data in analog format by a matrix of stored values also in analog format and of positive or negative sign. The analog input quantity in the...
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4159528 |
Parallel transfer analyzer for performing the chirp Z transform
P-point transform analyzer using M N-point serial transform devices in parallel, the output signals therefrom being combined in K J-point serial transform devices in parallel, where M, N, K, and J...
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4144581 |
Audio signal processor
Random audio signals are converted into sine-waves of corresponding frequency and duration, and harmonics are derived from the sine-waves. The harmonics are controllably attenuated and selectively...
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