Abstract: An apparatus and method for increasing perceived reflectance of the blue component in a video image to achieve a balanced, full-color image when viewed on a video projection screen. The apparatus includes a video projection screen having a plurality of blue reflective elements, interspersed in an even distribution throughout a plurality of standard white reflective elements, for modifying a reflective index of the video projection screen to decrease the gain of the red and green components of a standard video transmission, resulting in an increase in perceived reflectance of the blue component of a video image when projected on the video projection screen. The method comprises the steps of adding blue pigment to a standard white projection screen; decreasing, responsive to the blue pigment, a red-green gain; and viewing a balanced, full-color image having a perceived increase in the reflective intensity of the blue component.
Abstract: A system and method for imaging and viewing, by a viewer, color and monochrome images as simultaneously three-dimensional and two-dimensional images. The invention comprises a camera device, a viewing device for displaying the images, a transmitter for transmitting a drive signal, and at least one pair of viewing glasses. The camera device includes a single imaging lens having a bifurcated, dual-aperture light valve, and a single image space for receiving and overlaying a plurality of left-eye images and a plurality of right-eye images at a field rate driven by the drive signal. The pair of viewing glasses includes a left-viewing-light valve and a right-viewing-light valve. In response to receiving the drive signal, the left-viewing-light valve opens and closes, synchronized with the field rate, for viewing the plurality of left-eye images.
Abstract: A system and method for synchronizing a Costas Loop for demodulating a received spread-spectrum signal using a squaring device, a filter, a phase detector, a phase unwrapping subsystem, an oscillator, a derotator and a decision device. Phase-shift-keying modulation is removed from a received spread-spectrum signal through squaring. An in-phase component and a quadrature-phase component of the received spread-spectrum signal are filtered to generate an arbitrary phase angle, .theta.(t). A value of .theta. proportional to .theta.(t) is then estimated. The estimated .theta. value is processed to obtain an estimate for the .phi. value, and a cosine and a sine of the estimated .phi. value are generated by the oscillator. The derotator derotates the in-phase-component and the quadrature-phase component of the received spread-spectrum signal with the cosine and the sine of the estimated .theta. value to generate a demodulated signal. The decision device evaluates the demodulated signal and outputs data.
Abstract: A method for reducing distortion of an information symbol in an information symbol sequence. The information symbol sequence is transformed to a channel symbol sequence for modulating a carrier signal. The channel symbol sequence employs an M-ary signalling scheme. A received signal, which includes a channel symbol, a distortion value and a noise value, is demodulated as a received sample. An index value is determined from a previous information symbol interval. Using the index value the method selects an inverse distortion function for processing the received sample. A corrected sample is calculated using the inverse distortion function. The method determines a value of an information symbol, and a respective index, from the corrected sample. The method includes an adaption phase. The adaption phase adapts the nonlinear equalizer using a linear distortion function.
Abstract: A reconfigurable, associative network apparatus and method. During a configuration phase of the associative network apparatus, active signals corresponding to wanted input patterns are configured as an associative network and distinguished from signals corresponding to unwanted input patterns; wanted input patterns can be further associated with output patterns corresponding to wanted responses. During an operational phase of a previously configured associative network, input patterns are formed from signals produced by one or a plurality of activated inputs. Selected input patterns are then filtered from a set of possible input patterns, and output patterns are obtained in response to a particular set of connections between input and output signals.
Abstract: A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The plurality of spread-spectrum-processing circuits uses a timed version of the plurality of chip-code signals, for spread-spectrum processing the plurality of despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an i.sup.
May 29, 1996
Date of Patent:
February 17, 1998
InterDigital Technology Corporation
Donald L. Schilling, John Kowalski, Shimon Moshavi
Abstract: A fuzzy-logic spread-spectrum adaptive power control system comprising a base station and a plurality of remote units. The base station receives a spread-spectrum signal, and samples the despread spread-spectrum signal at a peak correlation time of the data channel, and at a non-peak correlation time of the data channel. This in turn generates a signal level and a noise level, respectively. A signal-to-noise ratio calculator generates a signal-to-noise ratio from the signal level and the noise level. A fuzzy-logic controller compares the signal-to-noise ratio to a set of predetermined thresholds, and using a state machine, generates a control signal which is thereby transmitted to the remote unit, indicating the amount by which to increase or decrease transmitted power. Each remote unit demodulates the control signal, and a transmitter controller adjusts a power level of the remote-unit spread-spectrum transmitter.
Abstract: A superior and scaleable architecture for implementing a large bit matched filter. The implementation of the bit matched filter requires less silicon and consumes less power as compared to the existing design. An effective way to turn the bit matched filter on and off for power saving is also disclosed.
Abstract: A spread-spectrum CDMA communications system for communicating data between a plurality of users to a plurality of spread-spectrum units. The spread-spectrum communications system is located within a same geographical region as occupied by an existing FDMA, proposed TDMA or any other mobile-cellular system. The spread-spectrum CDMA communications system includes a plurality of spread-spectrum-base stations and a plurality of spread-spectrum units. A spread-spectrum-base station has a comb filter for notch filtering predetermined channels of the mobile-cellular system, a device for converting the format of the data into a form for communicating over radio waves, a spread-spectrum modulator for spread-spectrum processing the data, and a transmitter for transmitting the spread-spectrum-processed converted data from the spread-spectrum-base station to a spread-spectrum unit.
Abstract: An improvement to a motion picture distribution system providing a high quality motion picture system compatible with pre-existing NTSC systems and improving horizontal and vertical detail. The improvement includes a television camera having an anamorphic lens, an encoder coupled to the television camera, and a decoder at a receiver. The anamorphic lens can have an aspect ratio of two to one, and compresses an entire motion picture viewing field into the NTSC-standard, four to three aspect ratio, to produce a horizontally-compressed image. The horizontally-compressed image is output from the television camera as a horizontally-compressed-image signal. The encoder encodes the horizontally-compressed-image signal as a composite-wideband-video signal having increased bandwidth, and generates a subcarrier-composite signal.
Abstract: An on-line database updating network system and method using object-oriented programming to build a program of discrete blocks, with each block being separately accessible, modifiable, and replaceable. The system includes a user terminal, a host terminal, and a communications channel. Origin dates of user module blocks of information stored in the user terminal are compared, over the communications channel, with origin dates of corresponding host module blocks of information stored in the host terminal. Host module blocks having origin dates more recent than corresponding user module blocks are downloaded as updated blocks over the communications channel to the user terminal. The downloaded updated blocks are then used to update the relevant user module blocks of information. Alternate host terminals may also be accessed by the user terminal, and updated alternate host module blocks of information may be downloaded to the user terminal.
Abstract: An electronic device for use as a communications terminal including means for determining a location of the electronic device, means for storing that location in the electronic device, means for receiving a wide-area broadcast, and means for executing location-specific instructions contained within the wide-area broadcast, responsive to the stored location. The invention further comprises a method for delivering a data channel signal having a plurality of location-dependent instructions, from a transmitter to a plurality of receiving units. The method comprises the step of transmitting the data channel signal to the plurality of receiving units. Once received by a particular receiving unit, the particular receiving unit identifies and executes location-dependent instructions within the data channel signal which correlate with the location of the particular receiving unit as stored in that receiving unit.
June 6, 1995
Date of Patent:
November 18, 1997
Radio Satellite Corporation
Gary Noreen, Theodore R. Harper, Ken Renshaw
Abstract: A modular, polymorphic network interconnecting a plurality of electronically reconfigurable devices via a modular, polymorphic interconnect, to permit a fixed, physical configuration of operating hardware devices to take on a plurality of logically addressable configurations. The modular, polymorphic interconnect further permits allocation and deallocation of selected electronically reconfigurable devices for a particular logically addressable configuration. The modular, polymorphic interconnect additionally permits the logical topology of selected electronically reconfigurable devices to be configured as at least one mixed-radix, N-dimensional network. The logical topology of mixed-radix, N-dimensional networks can be dynamically changed under control for a new configuration of logical addresses for selected electronically reconfigurable devices.
Abstract: An optical interconnect for use with SIMD processors, including holographic-optical elements, dove prisms, beamsplitters and a processor. Laser diodes, with each operating at a different wavelength, generate coherent-light beams at different wavelengths. A fiber combiner, an optical fiber and a fiber splitter are connected to divide output light from the laser diodes into equal path lengths. The output light is modulated by data from a respective SIMD processor. The output light forms an input ring at an input plane. Each holographic-optical element reflects only one wavelength of the output light. Dove prisms perform certain fixed interconnections. Beamsplitters reflect the light from the selected optical channel to an output-ring array.
Abstract: A spread-spectrum system and method for providing high capacity communications through multipath compensation. A multipath processor including a first plurality of correlators, a second plurality of correlators, a first adder, a second adder, and a selector device or a combiner device is provided for tracking a spread-spectrum signal arriving in a plurality of groups. The first plurality of correlators despreads a first group of spread-spectrum signals as a first group of despread signals which are added by the first adder to generate a first combined-despread signal. The second plurality of correlators despreads a second group of spread-spectrum signals as a second group of despread signals which are added by the second adder to generate a second combined-despread signal. The selector device selects either the first or the second combined-despread signal and outputs the selected signal.
Abstract: A system and method for imaging and viewing, by a viewer, color and monochrome three-dimensional and two-dimensional. images for broadcasting in accordance with NTSC, PAL, SECAM, and other world-wide electronic viewing formats. The invention comprises a camera device, a viewing device, a transmitter for transmitting a drive signal, and at least one pair of viewing glasses. The camera device includes a single imaging lens having a multi-aperture light value, and a single image space for receiving and overlaying a plurality of left-eye images and a plurality of right-eye images at a field rate driven by the drive signal. The pair of viewing glasses includes a left-viewing light valve and a right-viewing-light valve. In response to receiving the drive signal, the left-viewing-light valve opens and closes, synchronized with the field rate, for viewing the plurality of left-eye images.
Abstract: A spread-spectrum CDMA communications system for locating remote units, and for communicating message data between a plurality of remote units and a base station. The spread-spectrum CDMA communications system includes a plurality of base stations and a plurality of remote units. A base station has a spread-spectrum modulator for spread-spectrum processing the message data, and a transmitter for transmitting the spread-spectrum processed-message data, combined with a generic-chip-code signal, from the base station to a remote unit. The base station also has an antenna, and spread-spectrum detectors for recovering message-data communicated from the remote-units. A remote-unit has an antenna, and a detector coupled to the antenna for recovering data communicated from the base station. The detector includes a spread spectrum demodulator. Also, the remote unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter.
Abstract: A method and apparatus for encoding and convolutionally decoding a data word of a data word sequence. Each data word has k bits. An encoder selects, using a trellis encoding algorithm and a previous data word, a 2.sup.k subset of signal points from a square set of M by M signal points having X coordinates and Y coordinates. The square set of M by M signal points includes a constellation of 2.sup.k+1 signal points. The encoder selects, using the n.sup.th data word, a signal point from the selected subset of signal points. A modulator generates a first channel symbol and a second channel symbol from the selected signal point. A demodulator demodulates the first channel symbol as a received X coordinate and the second channel symbol as a received Y coordinate. A decoder estimates, using a second processor, a 2.sup.k received subset of signal points using the convolutionally decoding algorithm and a previously received data word. The decoder estimates, an n.sup.
Abstract: A phase array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath through the use of receiving means, delaying means, combining means, despreading means, generating means, storing means and comparing means. The receiving means receives a plurality of spread-spectrum signals and a plurality of phased versions of the plurality of spread-spectrum signals. The delaying means delays the received plurality of spread-spectrum signals with respect to the plurality of phased versions of the plurality of spread-spectrum signals by a plurality of delays. The combining means combines the delayed spread-spectrum signals and the plurality of phased versions of the plurality of spread-spectrum signals as a plurality of combined signals. The despreading means despreads the plurality of combined signals as a plurality of despread signals. The generating means generates a plurality of magnitude values from the plurality of despread signals.
Abstract: A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units. The frequency-hopping-communications system includes a plurality of base stations for communicating base-message data to the plurality of remote units. Each of the base stations has a coverage area divided into a plurality of N concentric regions with each concentric region assigned one of the N sets of frequencies.