| Patent Number |
Title Of Patent |
Date Issued |
| D361995 |
Mobile radio |
September 5, 1995 |
|
| D356317 |
Control head for a mobile radio |
March 14, 1995 |
|
| D356316 |
Remote control head for mobile radio |
March 14, 1995 |
|
| D356308 |
Mobile radio with handle |
March 14, 1995 |
|
| D347427 |
Portable radio |
May 31, 1994 |
|
| D347426 |
Portable radio with attached battery |
May 31, 1994 |
|
| D347425 |
Portable radio |
May 31, 1994 |
|
| D346582 |
Battery for portable radios |
May 3, 1994 |
|
| D344927 |
Battery for portable radios |
March 8, 1994 |
|
| D310813 |
Battery for a portable radio |
September 25, 1990 |
|
| D309456 |
Positive lock hanger for a telephone handset |
July 24, 1990 |
|
| D309302 |
Front cover for cellular portable telephone |
July 17, 1990 |
|
| 6400926 |
Radiocommunication system using geostationary and non-geostationary satellites |
June 4, 2002 |
| 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 successively launched into positio |
| 6138347 |
Method and apparatus for the suppression of electromagnetic interference in an electronic system |
October 31, 2000 |
| 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 device. The strap is positioned on the |
| 6004028 |
Device and method for receiving and reconstructing signals with improved perceived signal qualit |
December 21, 1999 |
| 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 symbols representing an information si |
| 5920984 |
Method for the suppression of electromagnetic interference in an electronic system |
July 13, 1999 |
| 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 device. The strap is positioned on the |
| 5699354 |
Audio routing within trunked radio frequency multisite switch |
December 16, 1997 |
| A distributed trunked radio frequency (RF) switching network (multisite switch) distributes audio routing control information and digitized audio signals to communications interface modules (nodes) throughout the multisite switch, thus avoiding a centralized mixing matrix, increasing |
| 5699353 |
Extended trunked RF communications systems networking |
December 16, 1997 |
| In a trunked communications network, a multiple site information distribution control "switch" (multisite switch) provides access to digitized audio and control signals from various audio sources to one or more audio destinations connected at various "nodes" in the multisite switch. |
| 5600676 |
Modulation scheme with low envelope variation for mobile radio by constraining a maximum modulus |
February 4, 1997 |
| 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 reduction in envelope variation |
| 5592556 |
Digital radio with vocoding encrypting codec |
January 7, 1997 |
| A new digital radio includes codec, vocoder and encryption/decryption processing all on a single integrated circuit chip module. Great flexibility is provided in terms of different operating modes (e.g., encrypt/decrypt only, vocode only, or encrypt/decrypt and vocode). Radio control |
| 5586128 |
System for decoding digital data using a variable decision depth |
December 17, 1996 |
| 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 to reduce decision delay. In the |
| 5583885 |
Method and apparatus for encoding and decoding automatic radio indentification data |
December 10, 1996 |
| 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 particular radio frequency channe |
| 5577068 |
Generalized direct update viterbi equalizer |
November 19, 1996 |
| 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 for various transmitted symbol sequ |
| 5574967 |
Waste energy control and management in power amplifiers |
November 12, 1996 |
| 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 amplitude signal bearing the phas |
| 5572552 |
Method and system for demodulation of downlink CDMA signals |
November 5, 1996 |
| 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 conjugates of channel tap estimate |
| 5570062 |
AM-FM transmitter power amplifier using class-BC |
October 29, 1996 |
| 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 operated in several modes, inclu |
| 5569889 |
Key assembly and keyboard comprising key retraction and stabilization means |
October 29, 1996 |
| 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, inactive position. The use of a pivot |
| 5568518 |
Fast automatic gain control |
October 22, 1996 |
| 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 converted from analog to digi |
| 5568511 |
System and method for radio disconnect and channel access for digitized speech trunked radio sys |
October 22, 1996 |
| 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 signal is transmitted from the cu |
| 5568088 |
Waste energy control and management in power amplifier |
October 22, 1996 |
| 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 amplitude signal bearing the phas |
| 5566168 |
TDMA/FDMA/CDMA hybrid radio access methods |
October 15, 1996 |
| 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 length segments. The signal segmen |
| 5557645 |
Channel-independent equalizer device |
September 17, 1996 |
| A demodulator for demodulating a signal modulated with digital information symbols so as to extract the information symbols is disclosed. A receiver receives a signal over a communications channel and samplers and digitizers produce a sequence of numerical sample values representative of |
| 5555257 |
Cellular/satellite communications system with improved frequency re-use |
September 10, 1996 |
| 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 transponds a combination of sign |
| 5553243 |
Method and apparatus for determining with high resolution the fidelity of information received o |
September 3, 1996 |
| 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 communications received over current and |
| 5553075 |
Packet data protocol for wireless communication |
September 3, 1996 |
| 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. |
| 5550809 |
Multiple access coding using bent sequences for mobile radio communications |
August 27, 1996 |
| 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 between the modulo-2 sum of two |
| 5546443 |
Communication management technique for a radiotelephone system including microcells |
August 13, 1996 |
| 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 channel for control information an |
| 5539730 |
TDMA/FDMA/CDMA hybrid radio access methods |
July 23, 1996 |
| 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 length segments. The signal segmen |
| 5535432 |
Dual-mode satellite/cellular phone with a frequency synthesizer |
July 9, 1996 |
| 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 form first conditioned signals for |
| 5530929 |
Homodyne receiver minimizing oscillator leakage |
June 25, 1996 |
| A method and a device in a homodyne receiver including a local oscillator generating an oscillator signal at a frequency of f.sub.LO, a mixer, and a reception device for receiving an input signal having a frequency of f.sub.RF, the oscillator signal and the input signal being supplied to |
| 5530722 |
Quadrature modulator with integrated distributed RC filters |
June 25, 1996 |
| 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 resistances are able to redress p |
| 5524275 |
Averaged RF exposure control |
June 4, 1996 |
| 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 power may be automatically reduced t |
| 5509056 |
Method and apparatus for executing automatic calling card access in cellular telephones |
April 16, 1996 |
| 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 carrier networks, detecting th |
| 5507013 |
Preferential deflection hinged housing configuration |
April 9, 1996 |
| 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 which is attached to and extends a |
| 5499272 |
Diversity receiver for signals with multipath time dispersion |
March 12, 1996 |
| 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 estimates from the data samples and |
| 5487181 |
Low power architecture for portable and mobile two-way radios |
January 23, 1996 |
| An extremely compact, full featured portable radio architecture conserves power by allowing a processor to sleep except when it needs to perform tasks. A lower power processor which acts principally as an interrupt controller but which performs other functions as well (e.g., tone decode, |
| 5487179 |
Arrangement for duplex transmission having transmitter power control |
January 23, 1996 |
| 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, and the transmitter filter and rece |
| 5485522 |
System for adaptively reducing noise in speech signals |
January 16, 1996 |
| A method and system are provided for adaptively reducing noise in frames of digitized audio signals that may include both speech and background noise. Frames of digitized audio signals are processed to determine what attenuation (if any) should be applied to the current frame of digitize |
| 5483670 |
Trunked radio repeater system with control channel monitoring feature |
January 9, 1996 |
| A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a much higher digital signalling rate than is typically found in prior art systems, and us |
| 5483575 |
System for correlating RF usage in a trunked communication network based on channel assignments |
January 9, 1996 |
| A system and method are disclosed for correlating rf communications in a multi-site, trunked rf communication system which includes a plurality of site controllers for controlling radio unit rf communications in corresponding geographical site areas and at least one multi-site coordi |
