Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 6400926 | Radiocommunication system using geostationary and non-geostationary satellites A radiocommunication system and method using a combination of a geostationary (GEO) and a plurality of medium earth orbit (MEO) satellites are disclosed. First, a GEO satellite is launched to provide initial system capacity. Next, MEO satellites are succe... | 06/04/2002 |
| 6138347 | Method and apparatus for the suppression of electromagnetic interference in an electronic system A conductive strap configured to attach to a circuit board containing a component sensitive to electronmagnetic interference (EMI) and to slidably contact an enclosure having a conductive internal surface can reduce or eliminate EMI in an electronic devic... | 10/31/2000 |
| 6004028 | Device and method for receiving and reconstructing signals with improved perceived signal quality A device and method for receiving and reconstructing signals with improved perceived signal quality in a digital communications system is disclosed. The device and method utilize side information defining the quality or accuracy of recovered digital symbo... | 12/21/1999 |
| 5920984 | Method for the suppression of electromagnetic interference in an electronic system A conductive strap configured to attach to a circuit board containing a component sensitive to electronmagnetic interference (EMI) and to slidably contact an enclosure having a conductive internal surface can reduce or eliminate EMI in an electronic devic... | 07/13/1999 |
| 5600676 | Modulation scheme with low envelope variation for mobile radio by constraining a maximum modulus of a differential phase angle A digital radio communication system achieves low envelope variations in a transmitted signal by encoding digital information as phase angle differences in a transmitted radio signal and by constraining the maximum possible phase angle difference. This re... | 02/04/1997 |
| 5586128 | System for decoding digital data using a variable decision depth In a digital data decoder such as a Viterbi algorithm decoder, digital data transmitted over a communications channel are estimated by a receiver using a variable decision depth technique to thereby improve bit error rate (BER) and channel estimation and ... | 12/17/1996 |
| 5583885 | Method and apparatus for encoding and decoding automatic radio indentification data A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a part... | 12/10/1996 |
| 5577068 | Generalized direct update viterbi equalizer A radio receiver for demodulating and equalizing digital information is disclosed. The receiver receives radio signals and processes the signals to produce data samples which are then stored. Reference values that model what the receiver should receive fo... | 11/19/1996 |
| 5574967 | Waste energy control and management in power amplifiers An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant ... | 11/12/1996 |
| 5572552 | Method and system for demodulation of downlink CDMA signals Demodulation of a CDMA downlink signal is performed by filtering correlations of the received signal with a known signature sequence. Unlike the conventional RAKE receiver, the filtering is not necessarily a FIR filter with coefficients equal to the conju... | 11/05/1996 |
| 5570062 | AM-FM transmitter power amplifier using class-BC A power amplifier circuit for efficiently generating an output signal into a load at more than one alternative power level has at least two amplifiers, each having optimum efficiency at different power output levels. The power amplifier circuit may be ope... | 10/29/1996 |
| 5569889 | Key assembly and keyboard comprising key retraction and stabilization means A retractable key assembly comprising a key top and an externally extending pivot arm. The pivot arm allows arcuate movement of the key top about a pivot axis such that the key top can be used in an upper, active keying position or stored in a lower, inac... | 10/29/1996 |
| 5568088 | Waste energy control and management in power amplifier An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant ... | 10/22/1996 |
| 5568511 | System and method for radio disconnect and channel access for digitized speech trunked radio systems In half-duplex, trunked digitized voice communications between mobile transceivers, the present invention minimizes time delays occurring after one transceiver ends a transmission and before other transceiver communications may commence. A disconnect sign... | 10/22/1996 |
| 5568518 | Fast automatic gain control A method for demodulating or decoding a digitally modulated data signal is disclosed wherein AGC parameters are retain and update or discard in parallel with deciding the data patterns most likely to have been transmitted. First, the received signals are ... | 10/22/1996 |
| 5566168 | TDMA/FDMA/CDMA hybrid radio access methods A radio access method for facilitating communication between at least one first station and a plurality of second stations is disclosed. First, each signal intended for transmission is buffered at a first station. The signals are then divided into equal l... | 10/15/1996 |
| 5555257 | Cellular/satellite communications system with improved frequency re-use The invention relates to a radio communication system and method for minimizing co-channel interference. The system comprises a plurality of mobile stations in communication with a ground based station via an orbiting satellite. The orbiting satellite tra... | 09/10/1996 |
| 5553075 | Packet data protocol for wireless communication A protocol for communicating over a network, for example a wireless network, is disclosed. Protocol data units for establishing and destroying a connection, data transmission and reception control, status and error are provided.... | 09/03/1996 |
| 5553243 | Method and apparatus for determining with high resolution the fidelity of information received on a communications channel A method and apparatus for determining with high resolution the fidelity of communications over a communications channel is disclosed. Portable/mobile radios freely roaming between multiple trunked RF communications sites calculate the fidelity of communi... | 09/03/1996 |
| 5550809 | Multiple access coding using bent sequences for mobile radio communications Information symbols spread using orthogonal or bi-orthogonal codewords are assigned a unique scramble mask that is taken from a set of scramble masks having selected correlation properties. The set of scramble masks is selected such that the correlation b... | 08/27/1996 |
| 5546443 | Communication management technique for a radiotelephone system including microcells In a radiotelephone system, the control channel in all cells in an area can be simulcasted. A microcell base station may be provided with a receiver to listen on the umbrella cell control channel for messages, in addition to listening on its own control c... | 08/13/1996 |
| 5539730 | TDMA/FDMA/CDMA hybrid radio access methods A radio access method for facilitating communication between at least one first station and a plurality of second stations is disclosed. First, each signal intended for transmission is buffered at a first station. The signals are then divided into equal l... | 07/23/1996 |
| 5535432 | Dual-mode satellite/cellular phone with a frequency synthesizer A radio telephone which is capable of switching between operating through a land based cellular network and an orbiting satellite system is disclosed. First antenna and radio frequency circuits receive transmitted signals from the land-based network and f... | 07/09/1996 |
| 5530722 | Quadrature modulator with integrated distributed RC filters A quadrature modulator for generation of complex modulated signals includes a unique pair of balanced, low-pass filters which, through a switching arrangement for switching into and out of the circuit distributed RC line sections and corresponding ground ... | 06/25/1996 |
| 5530929 | Homodyne receiver minimizing oscillator leakage A method and a device in a homodyne receiver including a local oscillator generating an oscillator signal at a frequency of fLO, a mixer, and a reception device for receiving an input signal having a frequency of fRF, the oscillator ... | 06/25/1996 |
| 5524275 | Averaged RF exposure control A radio transmitter output power controller which automatically restricts the maximum transmitting time during an averaging time so that the average power remains below an acceptable level. Additionally or alternatively, the maximum transmitter output pow... | 06/04/1996 |
| 5509056 | Method and apparatus for executing automatic calling card access in cellular telephones A method of placing a calling account card telephone call on a call by call basis using one of a plurality of carrier networks is disclosed. The method includes the steps of storing a plurality of data sets in accordance with requirements for use of the c... | 04/16/1996 |
| 5507013 | Preferential deflection hinged housing configuration A hinge configuration particularly suitable for use with a radiotelephone includes: an arcuate hinge body having a predetermined body length, a predetermined body thickness and a predetermined radius of curvature; and a pair of arms, a respective one of w... | 04/09/1996 |
| 5506861 | System and method for joint demodulation of CDMA signals Methods and systems for jointly demodulating CDMA signals are presented. The disclosed methods and systems provide, among other advantages, for accurate demodulation of such signals in multipath, time-dispersion environments. Single signal or multiple sig... | 04/09/1996 |
| 5499272 | Diversity receiver for signals with multipath time dispersion A digital communications receiver provides joint MLSE equalization and diversity combining. A plurality of diversity branches are processed to produce complex receive data samples and synchronization information. Channel estimators then form channel estim... | 03/12/1996 |
| 5493582 | Method and apparatus for encoding and decoding automatic radio identification data A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a part... | 02/20/1996 |
| 5487179 | Arrangement for duplex transmission having transmitter power control An arrangement for duplex transmission in a radio or similar device with a transmitter and receiver comprises a transmitter filter, receiver filter and preferably a transmitter/receiver device. The receiver filter may be a surface acoustic wave filter, an... | 01/23/1996 |
| 5475705 | Demodulator for Manchester-coded FM signals Binary signals that are transmitted by Manchester coding and frequency modulation are demodulated based on the behavior of the phase or complex vector value of the received signal. The polarities of the information bits may be determined by measuring the ... | 12/12/1995 |
| 5475683 | Method and apparatus for permitting radio unit roaming between trunked RF transmission sites over a wide area that encompasses plural multisite networks Digitally trunked radio transceivers are permitted to roam over an extended coverage area including two or more digitally trunked radio frequency communication networks. Each network includes at least one digital repeater site having a corresponding site ... | 12/12/1995 |
| 5428668 | Radio personal communications system and method for allocating frequencies for communications between a cellular terminal and a base station Transceiver frequency and optionally power level are allocated to a radio personal communications system which includes a base station connected to a wire telephone network and a cellular terminal operating within a region of a wide area cellular network ... | 06/27/1995 |
| 5425049 | Staggered frequency hopping cellular radio system A communication system having a frequency hopping scheme which provides increased interferer diversity without increased system delay is disclosed. The frequency hopping scheme includes providing a staggered offset period between hops of neighboring or ad... | 06/13/1995 |
| 5423078 | Dual mode power amplifier for analog and digital cellular telephones The present invention relates generally to RF power amplifiers for portable cellular radiotelephones, and more particularly, to dual-mode cellular radiotelephones. A power supply network enables the RF power amplifier in a dual-mode radiotelephone to oper... | 06/06/1995 |
| 5423074 | AM-FM transmitter power amplifier A power amplifier used in a portable, radio frequency transmitter is switched between different modes of operation when transmitting differently modulated carriers. The first mode of operation corresponds to amplitude modulation (AM), while a second mode ... | 06/06/1995 |
| 5408680 | Single channel autonomous digitally trunked RF communications system A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned channel mode. Digital control channel signalling results in temp... | 04/18/1995 |
| 5406227 | Method and apparatus for controlling RF spectral splatter into adjacent channels when activating an RF transmitter A simple and effective "RF snubber" circuit resolves the problems associated with transient spectral noise caused by radio transmitter activation in nearby channels. By connecting an RF snubber circuit in parallel with the RF amplifier output, the rise ti... | 04/11/1995 |
