Method and apparatus for public key exchange in a cryptographic system
The present invention is an elliptic curve cryptosystem that uses elliptic curves defined over finite fields comprised of special classes of prime numbers. Special fast classes of numbers are used to ... Read More
Inventors: Crandall, Richard E.;, Assignee: NeXT Computer, Inc. (Redwood City, CA) |
Method of privacy communication using elliptic curves
Accordingly, the present invention has an object to provide a method of privacy communication using elliptic curves which define an EDLP unsolvable by the reducing method. The above object is fulfille... Read More
Inventors: Miyaji, Atsuko; Tatebayashi, Makoto;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Comparison circuit for masking transient differences
I claim: 1. A comparison circuit for comparing first and second binary signals which are transmitted to said comparison circuit, said comparison circuit comprising: delay means which recieves the firs... Read More
Inventors: Feldbrugge, Fredericus H. J.;, Assignee: Digital Equipment Corporation (Maynard, MA) |
Six channel digital demodulator
It is a principal object of the present invention to provide a novel programmable digital demodulator having a code error channel, a signal level channel and a phase or frequency error channel. It is ... Read More
Inventors: Kingston, Samuel C.; Barham, Steven T.; Simonsen, Harold L.;, Assignee: Unisys Corporation (Blue Bell, PA) |
Fiber optic switching network
FIG. 1 shows a ring wiring center (RWC) represented by broken block 10. The center includes a plurality of node switches NS1, NS2, - - - , NSN. Each node switch may be implemented as indicated below.... Read More
Inventors: Gade, Raja R.; Levinson, Frank H.;, Assignee: AMP Incorporated (Harrisburg, PA) |
Suppressed carrier modulator using differential amplifier
Accordingly, it is an object of this invention to provide a novel suppressed carrier modulation system having a large dynamic range even with a low source voltage. Another object of this invention is ... Read More
Inventors: Fujisaki, Hitoshi;, Assignee: Hitachi Denshi Kabushiki Kaisha (Tokyo, JP) |
Garnet centering ring for circulators and isolators
The present invention is designed to overcome the above noted limitations that are attendant in the "prior art" and toward this end it contemplates the provision of a novel centering ring which will h... Read More
Inventors: Fisher, David S.; Gustafson, Warren H.;, Assignee: Radio Frequency Systems, Inc. (Marlboro, NJ) |
Microwave power amplifier
OF THE SHOWN EMBODIMENT Referring particularly to the drawing, there is shown the microwave power amplifier 10 of this invention. The amplifier 10 is constructed of an electrically conductive housing... Read More
Inventors: Hom, Harvey K. Y.;, Assignee: Microwave Components and Systems, Inc. (Westlake Village, CA) |
Gain control circuit
The principal object of this invention is to realize a gain control circuit which varies the gain of an amplifier circuit approximately at geometric intervals, in other words, the gain in logarithmic ... Read More
Inventors: Ishizuka, Kohei; Kita, Yasuhiro; Maeda, Narimichi;, Assignee: Hitachi, Ltd. (Tokyo, JP) |
Differential amplifier circuit having controllable gain
I claim: 1. Differential amplifier circuit, comprising a first differential amplifier stage formed of a pair of transistors having inputs and output circuits, said inputs of said transistor pair of sa... Read More
Inventors: Fenk, Josef;, Assignee: Siemens Aktiengesellschaft (Berlin and Munich, DE) |
Logarithmic amplifier
FIG. 7 depicts an ideal logarithmic response 40 for a device which generates an instantaneous voltage or current output proportional to the logarithm of its instantaneous input voltage. A logarithm i... Read More
Inventors: Gilbert, Barrie;, Assignee: Analog Devices, Inc. (Norwood, MA) |
System and method for controlling a gain circuit
In accordance with the present invention, a system and method for controlling a gain circuit is provided which substantially eliminates or reduces disadvantages and problems associated with prior syst... Read More
Inventors: Trafton, Fredrick W.;, Assignee: Texas Instruments Incorporated (Dallas, TX) |
Resistor programmable temperature switch
What is claimed is: 1. A resistor programmable temperature switch for indicating that a preselected trip temperature has been reached, comprising: first and second bipolar transistors of like polarity... Read More
Inventors: Brokaw, A. Paul;, Assignee: Analog Devices, Inc. (Norwood, MA) |
Tuned phase stable limiter amplifier
The foregoing objects and other objects are attained wherein there is provided in accordance with the invention a limiter amplifier comprising a pair of bipolar transistors arranged in a common emitte... Read More
Inventors: Kinkel, John F.;, Assignee: Hughes Aircraft Company (Los Angeles, CA) |
Multiplying saw phase shift envelope detector
A radio-frequency deflection apparatus is disclosed which includes a signal input for providing an input signal and a phase shifter having a first connection and a second connection; the phase shifter... Read More
Inventors: Papadopoulos, Costas;, Assignee: Whistler Corporation (Westford, MA) |
Gain control or multiplier circuits
OF THE INVENTION Referring at this time to FIG. 1, a diagrammatic multiplier circuit system is illustrated therein. As shown, the circuit includes an input terminal 10 to which an input signal of ac ... Read More
Inventors: Roberts, John H.;, Assignee: Peavey Electronics Corporation (Meridian, MS) |
Method and apparatus for providing a representation of an input voltage at a disabled voltage multiplier's output
I claim: 1. A voltage multiplier that provides a linear representation of an input voltage when the voltage multiplier is disabled, the voltage multiplier comprises: an input differential multiplying ... Read More
Inventors: Fergus, George H.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Method and circuit for non-cooperative interference suppression of radio frequency signals
A circuit for separating a radio frequency signal of interest from an interfering signal, constructed in accordance with this invention comprises a circuit for producing first and second signals, the ... Read More
Inventors: Dickerson, Roger W.;, Assignee: Xetron Corporation (Cinncinnati, OH) |
Direct-coupled active balanced mixer
A low-power, high performance mixer according to the invention includes a diode ring and first and second active baluns. The first active balun has an input coupled to a radio frequency (PAT) signal. ... Read More
Inventors: Kobayashi, Kevin W.;, Assignee: TRW Inc. (Redondo Beach, CA) |
Apparatus and method which saves call related information when the status of recorded voice message is changed remotely
In accordance with the principles of the present invention, a voice messaging system and method includes a receiver to receive information relating to an incoming telephone call and memory to store th... Read More
Inventors: Cannon, Joseph M.; Johanson, James A.; McDowell, Richard Lawrence;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Mobile phone combined physiological function detector
OF THE PREFERRED EMBODIMENT As shown in FIG. 1, a mobile phone combined physiological function detector comprises a physiological function signal receivable mobile phone set 10 and a measurer 20 whic... Read More
Inventors: Shen, Ein-Yiao;, Assignee: |
Bottle-cap medication reminder and overdose safeguard
The present invention has been found to be useful in the dispensing of pharmaceuticals to patients or other users. A user is not necessarily a patient (i.e, someone suffering from an ailment). One ma... Read More
Inventors: Sagar, Richard Bryan;, Assignee: Koninklijke Philips Electronics N.V. (Eindhoven, NL) |
Method and apparatus for billing for usage-based group communication between wireless devices
The disclosed embodiments provide novel and improved methods and apparatuses for billing for individual usage of push-to-talk services for mobile communication devices. In one aspect, the invention is... Read More
Inventors: Brewer, Beth Ann; Kenagy, Jason B.;, Assignee: Qualcomm Inc. (San Diego, CA) |
Current-controlled quadrature oscillator based on differential g.sub.m /C cells
It is, therefore, an object of the invention to improve the phase noise of quadrature oscillators. A current-controlled quadrature oscillator based on differential gm/C cells is described. The oscilla... Read More
Inventors: Gilbert, Barrie;, Assignee: Analog Devices (Norwood, MA) |
Voltage controlled oscillator formed of two differential transconductors
In the present invention, a phase lock loop includes a first pseudo random number based counter for providing a divided reference signal responsive to a reference clock. A phase detector provides a co... Read More
Inventors: Sutardja, Pantas; Sutardja, Sehat;, Assignee: Marvell Technology Group, Ltd. (Sunnyvale, CA) |
Method and apparatus for an acquisition-aided Geo-locating subscriber unit
OF PREFERRED EMBODIMENTS The present invention describes a subscriber unit and global communication system that have been adapted to work with each other to achieve an improved method for subscriber ... Read More
Inventors: Kurby, Christopher Neil; King, Thomas Michael;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Compact voltage controlled ring oscillator with quadrature outputs
A compact voltage controlled ring oscillator with quadrature outputs is provided according to the principle of this invention comprising two variable delay gates (VDGs), a first variable delay gate an... Read More
Inventors: Tso, Robert; Herman, Ray Michael;, Assignee: SiRF Technology, Inc. (Santa Clara, CA) |
Method and apparatus for efficient GPS assistance in a communication system
This method and apparatus disclosed herein efficiently transmits location assistance information to a mobile communication device over a control channel with a minimal impact on the capacity of the co... Read More
Inventors: Agashe, Parag A.; Vayanos, Alkinoos Hector; Soliman, Samir S.;, Assignee: Qualcomm Incorporated (San Diego, CA) |
Differential global positioning system using almanac data for a fast time to first fix
It is therefore an object of the present invention to provide a differential global positioning system (DGPS) using the GPS almanac data for measuring ranges to GPS signal sources and for determining ... Read More
Inventors: Eschenbach, Ralph F;, Assignee: Trimble Navigation Limited (Sunnyvale, CA) |
Method and apparatus for satellite positioning system based time measurement
The present invention provides methods and apparatuses for measuring time related to satellite data messages which are used with satellite position systems, such as GPS or Glonass. A method in one emb... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (Campbell, CA) |
Cell Phones 
