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Class 359/306 - Correlation or convolution


Subclass of Class 359 - Optical: systems and elements
Definition: Subject matter wherein the correlation or convolution integral
No. of patents: 41
Last issue date: 10/28/2008


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NumberTitleIssue Date
7444014Extended depth of focus microscopy
Imaging techniques. The focus of an imaging device is varied while acquiring an image of an object. The resulting blurred image is deconvolved to generate, in one embodiment, a two-dimensional projection image of three dimensions of the object. ...
10/28/2008
7369600Burst communications apparatus and method using tapped delay lines
A communications apparatus and method use tapped delay lines as multiplexers and demultiplexers. In one embodiment, a receiver (100) uses a tapped delay line (110) as a demultiplexer to acquire a burst communication at very high data rates in the range...
05/06/2008
7253950Scanning laser microscope
A scanning laser microscope is provided which includes at least one laser light source for emitting laser light, a plurality of modulating sections for adjusting the laser light emitted from each laser light source, a storage section for storing delay time informati...
08/07/2007
7130292Optical processor enhanced receiver architecture (opera)
A method and apparatus for enhancing the receiving and information identification functions of multiple access communications systems by employing one or more optical processors configured as a bank of 1-D correlators. The present invention is particularly useful in...
10/31/2006
7127172Optical frequency filter
The present invention relates to an optical signal shaping device such as an optical filter having a profile such that transmission of light through the device varies as a function of frequency over a selected bandwidth. The optical signal shaping device of the pres...
10/24/2006
6996291Systems and methods for correlating images in an image correlation system with reduced computational loads
After one or both of a pair of images are obtained, an auto-correlation function for one of those images is generated to determine a smear amount and possibly a smear direction. The smear amount and direction are used to identify potential locations of a peak portio...
02/07/2006
6587255Acousto-optic scanning system with fast non-linear scan
An acousto-optic scanning system, which relies on two counter propagating acoustic waves with the same frequency modulation. This scheme completely suppresses the linear frequency chirp, and thus enables the generation of fast non-linear scans and non-con...
07/01/2003
6404535Optically implemented wideband complex correlator using a multi-mode imaging device
An optically implemented wide bandwidth correlation system (10) that employs a multi-mode imaging device (42) and a particular modulation format to provide both in-phase and quadrature phase correlation components in a single correlation process. The corr...
06/11/2002
6404536Polarization independent tunable acousto-optical filter and the method of the same
The present invention pertains to a polarization independent tunable acousto-optical filter and the corresponding method. The filter diffracts an input light beam into a first input light beam unaffected by acoustic waves and a second input light beam aff...
06/11/2002
5955993Detection of spread spectrum signals
A spread spectrum signal detection system comprising two spatially separated receivers, a correlator, such as a time integrating correlator employing acousto-optic cells, which is connected to the outputs from the two receivers to produce a signal represe...
09/21/1999
5923460Mechanism for extending instantaneous RF frequency coverage for an acousto-optic coherent channel receiver (AOCCR) via bandwidth dilation
In order to increase the available signal processing bandwidth of an acousto-optic coherent channelizer, the optical beam spot-shaping and projection components of the channelizer are configured to project M reference beam spots upon each photodetector of...
07/13/1999
5822111Apparatus and method for coherent acousto-optic signal width modification
A apparatus and method for coherently stretching or compressing signals of nterest, i.e. without loss of information. A first, or tapping, Bragg cell has an acoustic signal launched in it which is modulated onto a laser carrier. The signal of interest is l...
10/13/1998
5420826Optical correlator and method of using same
An apparatus including a first light modulator for modulating a first light beam with a signal, a second light modulator for modulating a second light beam with a reference signal, first lens means, positioned in an optical path of the second light beam, ...
05/30/1995
5410427Method for the detection, recognition and use of signals mixed with other encoding or parasitic signals, and apparatus for performing the method
The invention is a method that considerably improves the rapidity of collection and recognition of electrical signals that are mixed with other signals that impede direct access. The subject of the invention is a method for detection, recognition and use ...
04/25/1995
5394257Optical neural network system
An optical system of an optical neural network model for parallel data processing is disclosed. Taking advantage of the fact that an auto-correlation matrix is symmetric with respect to a main diagonal and the weights for modulating the values of diagonal...
02/28/1995
5337170Quadratic optical processor for reducing multiplicative noise and other uses
A degenerate four-wave mixing arrangement employs a photorefractive crystal as a real time holographic recording medium to record a hologram of the noisy optical signal. The signal passes through the crystal and is phase conjugated by a self pumped barium...
08/09/1994
5281907Channelized time-and space-integrating acousto-optical processor
A novel channelized, hybrid time- and space-integrating acousto-optic (AO) spectrum analyzer is described. The architecture consists of two acousto-optic cells in a crossed cell configuration. The first acousto-optic cell is a wide bandwidth device that p...
01/25/1994
5247388Continuously variable delay lines
An acousto-optic apparatus is described that varies the time delay of electrical signals over a continuum of delays. In the preferred embodiment, a light source, which can be either coherent or incoherent, emits an optical beam that is focused into an aco...
09/21/1993
5202776Time delay beam formation
Optical systems are disclosed which are capable of generating and rapidly changing time delays of electrical signals for true time delay beam formation and beam steering. The systems utilize an interferometer configuration. A first optical modulator and a...
04/13/1993
5173790Adaptive filter with correlation weighting structure
An adaptive filter having a correlation weighting structue having a single Bragg cell, acting as a tapped delay line and having an input and an output, the Bragg cell intensity modulating a write laser beam for computing correlation values, and modulating...
12/22/1992
5166822Light beam frequency comb generator
A light beam frequency comb generator uses an acousto-optic modulator to generate a plurality of light beams with frequencies which are uniformly separated and possess common noise and drift characteristics. A well collimated monochromatic input light bea...
11/24/1992
5166766Thick transparent semiconductor substrate heterojunction acoustic charge transport multiple quantum well spatial light modulator
A one-dimensional or two-dimensional transmission mode spatial light modulator (SLM) includes one or more heterojunction acoustic charge transport (HACT) channels 18 with surrounding layers 16,20 vertically adjacent to a multiple quantum well (MQW) region...
11/24/1992
5159420Dual medium heterojunction acoustic charge transport multiple quantum well spatial light modulator
A one-dimensional or two-dimensional transmission mode spatial light modulator (SLM) includes two different mediums, one medium being a semiconductor comprising one or more heterojunction acoustic charge transport (HACT) channels 28 with surrounding layer...
10/27/1992
5153597Acousto-optical classifier
An acousto-optical classifier for classifying wide bandwidth signals such as high resolution radar returns of ships or very short pulse length signals of radar emitters. This is accomplished by generating the Fourier transform power spectrum with an acous...
10/06/1992
5121248Acousto-optic time-integrating signal processor
An acousto-optic correlator for wideband signals. The invention is defined by and relates to device in which a laser beam is split into two paths of a Mach-Zehnder interferometer arrangement. A first Bragg cell of which, modulated with a signal Re{S1...
06/09/1992
4866660Optoelectraulic devices based on interference induced carrier modulation
A subpicosecond solid state optical correlator based on interference induced carrier modulation includes a photosensor circuit having a photoconductive element and a pair of opposed electrodes. A voltage difference is created across the electrodes to defi...
09/12/1989
4833637Acousto-optic multi-channel space integrating correlator
Acousto-optic multi-channel space integrating correlators and methods of using the same are disclosed. The correlators consist of a single channel acousto-optic cell illuminated by a light source, with the light from the cell imaged onto a second acousto-...
05/23/1989
4722596Acousto-optic analyzer with dynamic signal compression
An acousto-optic spectrum analyzer in which the dynamic range is effectively extended by detecting the frequency bands wherein the photo-detectors are saturated and providing a filter to suppress those frequencies. With this pre-filter, the entire spectru...
02/02/1988
4641273General time, space and frequency multiplexed acousto-optic correlator
Time, space and frequency multiplexed time integrating acousto-optic correlators and exemplary uses thereof. The correlators utilize a plurality of radio frequency (RF) modulators, each operating at the same or a different RF frequency to provide excitati...
02/03/1987
4626102Bragg cell spectral analyzer with a prism expansion system
A Bragg cell spectral analyzer with a prism expansion system for a laser beam, which has a Gaussian cross-sectional distribution of light intensity, is generally superimposed with stray light, and is conducted along a path through the system to a Bragg ce...
12/02/1986
4591241Acousto-optical spectrum analyzer
The invention relates to an acousto-optical device comprising a laser source, positioned in the vicinity of the center of curvature of a spherical cap, formed from an elasto-optical, piezoelectric substrate. A piezoelectric transducer deposited on this su...
05/27/1986
4575191Compact beam splitter for acousto-optic correlator
A compact beam splitter apparatus for use with a surface wave acousto-optic time integrating correlator, including a beam splitter for splitting a laser light beam into two beams and a Koesters prism disposed in the paths of the two beams for folding a po...
03/11/1986
4566760Multi-product acousto-optic time integrating correlator
A device for processing signals to obtain a multi-product, time integrated, correlated output signal. A laser light beam is expanded and shaped into a sheet beam which is directed across the surface of an acousto-optic medium. Four acoustic transducers ar...
01/28/1986
4558925Multi-function acousto-optic signal processor
An acousto-optic architecture is provided for simultaneously obtaining time integration correlation and power spectrum analysis. A laser beam is expanded and split into first and second beams. The first beam is diffracted by a first acousto-optic Bragg ce...
12/17/1985
4514038Optical Fourier transformer device and optical correlator incorporating the said device
This optical Fourier transformer device supplying the correlation function of two motifs of an object illuminated in coherent light by using the double diffraction principle is essentially characterized in that it generates a complex wave conjugate of a w...
04/30/1985
4426134Three and four product surface-wave acousto-optic time integrating correlators
A method and device for processing spread-spectrum and other wideband comications and radar signals to obtain three and four product correlated signals. A laser beam is split and shaped into first and second sheet beams. The first beam is directed to a f...
01/17/1984
4421388Acousto-optic time integrating frequency scanning correlator
An acousto-optic time integrating two-dimensional frequency scanning correlator for cross-correlating signals which are separated in frequency. Two coherent light beams which are derived from the same laser are fed across respective Bragg cells, one cell ...
12/20/1983
4326778Acousto-optic time integrating correlator
A highly efficient time integrating acousto-optic correlator which determs the time difference of arrival of the signals being correlated as well as the center frequency and bandwidth of the signals. A surface acoustic wave delay line is provided with tw...
04/27/1982
4124281Scheme for terminal guidance utilizing acousto-optic correlator
An analog terminal guidance system and device. One dimensional strips of a arget scene are stored in a line in a longitudinally extending acousto-optic device as index of refraction variation pattern signals. Real time signals corresponding to the scene ac...
11/07/1978
4124280Acoustic-optic technique for processing many signals simultaneously
An acousto-optic apparatus utilizing multiplexing techniques, for obtaining he correlation of N pairs of signals. First and second sets of signals are combined in a piezoelectric crystal, and each signal in the first set is correlated only with its pair si...
11/07/1978
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