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Match Document Document Title
6950653 Scanning tone remote adapter for land-mobile radio dispatch for use with dispersed dispatch stations  
A land mobile radio dispatch system is provided, which comprises a radio, one or more remote dispatch devices, and a scanning tone remote adapter connected to the radio and the remote dispatch...
6700878 Communication network with improved access protocol  
A multiple access communication network is disclosed having a primary station that is coupled via a transmission medium to a plurality of secondary stations. The primary station is arranged for...
6330441 Communication system  
A communication system is provided having at least one radio base station with a voice data processing function. The station can communicate with plural mobile radio terminal equipment and has a...
5995849 Direct wireless communication system and method of operation  
A digital direct wireless communication system that permits direct, point-to-point communication (voice or data) between transceivers without the infrastructure associated with traditional cellular...
5982757 Method and apparatus for registering a remote unit in a communication system  
The method operates in the remote communication unit, the remote communication unit responsive to a first wireless communication system and to a second wireless communication system, and the method...
5867537 Balanced tranversal I,Q filters for quadrature modulators  
Radio transmissions are spectrally contained to reduce adjacent channel interference by a method and apparatus for I,Q filtering of signals before quadrature modulation in digital cellular radio...
5864762 Operating a trunked communication system in transmission and message trunked modes  
A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600...
5745523 Multi-mode signal processing  
A digital system accommodates analog communications, thus avoiding the need for separate subsystems each dedicated to either analog or digital communications. The system includes a receive circuit...
5727023 Apparatus for and method of speech digitizing  
A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal...
5629655 Integrated distributed RC low-pass filters  
A low pass filter including a number of different filter sections each having two input and two output terminals as well as a common terminal. Each filter section includes first and second...
EP0526207B1 Communication control device capable of quickly searching for an idle speech channel in a standby mode  
Abstract of EP0526207 In a communication control device which is operable in a standby mode or in an active mode and which is located between a cordless telephone set and a subscriber connected to...
EP0597492B1 Radio data system receiver  
Abstract of EP0597492 A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the...
5574788 Trunked radio repeater system  
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...
EP0395092B1 Mobile telephone system  
Abstract of EP0395092 On-board equipment for a mobile telephone system has a function of reporting the degree of busyness of message channels available in a service area. While the equipment is in...
5561852 Method and apparatus for establishing a communication link  
A portable radio (104) initiates a communication link using a synchronous protocol format. A base station (102) generates a synchronization pattern (200) which includes a marker. The marker (202)...
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...
5530700 Method and device for controlling time slot contention to provide fairness between a plurality of types of subscriber units in a communication system  
The present invention provides a unique access control scheme for assigning a plurality of time slots in a fair manner among subscriber units using a single time slot in a frame and subscriber...
5493711 Radio receiver for locating the strongest signal carrying a selected program  
A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the control circuit. When the...
5420911 Cellular telephone for monitoring analog and digital control channels  
The present invention is directed to a cellular mobile radio telephone system in which mobile stations may select either analog or digital control channels. Analog and dual-mode mobile stations are...
5410728 Satellite cellular telephone and data communication system  
A system for facilitating global cellular/trunked mobile communication is disclosed. This system permits communication with hand held and mobile mounted cellular telephones. The system permits...
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...
EP0446327B1 A METHOD FOR RADIOTELEPHONE AUTONOMOUS REGISTRATION  
Abstract not available for EP0446327 Abstract of corresponding document: US4972355 A cellular radiotelephone autonomous registration method. The radiotelephone attempts registration when a clock...
5369783 Dynamic regrouping in a trunked radio communications systems  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
EP0597492A1 Radio data system receiver.  
A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the control circuit. When the...
5274838 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
5265093 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5206863 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5203015 Automatic channel selection in a mobile radio for telephone interconnect  
A mobile radio programmed to analyze idle channel assignments issued by a repeater station and select different channels, if appropriate, which are especially adapted for communicating with other...
EP0526207A2 Communication control device capable of quickly searching for an idle speech channel in a standby mode.  
In a communication control device which is operable in a standby mode or in an active mode and which is located between a cordless telephone set and a subscriber connected to the device through a...
5175866 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
EP0248351B1 Cordless telephone system  
Abstract of EP0248351 A cordless telephone system constituted by a switching station (1) connected to a cable telephone exchanger and at least one telephone set connected to the switching station...
5128930 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5125102 Trunked radio repeater system including synchronization of a control channel and working channels  
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...
5117501 Dynamic regrouping in a trunked radio communications system  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5109543 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5086506 Radio trunking fault detection system with power output monitoring and on-air monitoring  
A trunked radio frequency (RF) repeater system for public service trunking (PST) or the like includes a fault detection system having an RF output power monitoring, over-the-air RF monitoring and...
5077828 RF channel expansion in a trunked radio communications system  
In a trunked radio frequency communications system, an arrangement dynamically "expands" or extends the frequency allocation table stored within the "personality" defining non-volatile storage...
EP0395092A2 Mobile telephone system.  
On-board equipment for a mobile telephone system has a function of reporting the degree of busyness of message channels available in a service area. While the equipment is in a stand-by condition...
4939746 Trunked radio repeater system  
A digital 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...
4926496 Method and apparatus for infrequent radio users to simply obtain emergency assistance  
A digital mobile radio transceiver allows even the most unsophisticated user to simply and easily obtain emergency communications. The transceiver is programmed with "personality" data specifying...
4905302 Trunked radio repeater system  
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...
4905234 Apparatus and method for transmitting digital data over a radio communications channel  
A digital radio RF signalling protocol communicates either digitized voice or digital data signals and indicates the type of information being communicated to the receiver. Multiple repeats of...
4903320 Apparatus for selecting control channel in mobile communication system  
In a mobile communication system having two operating systems co-existing in one area, a mobile station having a transmitting and receiving circuit and a control unit for subscribing to one of the...
4903262 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
4866788 Process for controlling retransmission of messages from transmitting stations belonging to a cellular system  
A process for controlling retransmission of messages from transmitting stations belonging to a cellular system. The stations transmit messages to a fixed base station, e.g. for requesting the...
4835731 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
4821292 Adaptive limiter/detector which changes time constant upon detection of dotting pattern  
A limiter/detector which takes advantage of the characteristics of the dotting pattern preceding each message in the General Electric Public Service Trunking System shortens bit synchronization...
4803679 Communication network capable of automatically informing a subscriber of occurrence of an idle channel  
In a communication network comprising a base station and a plurality of substations communicable with the base station through radio channels including a control channel, at least one of the...
4744101 Cordless telephone system  
A cordless telephone system constituted by a switching station connected to a cable telephone exchanger and at least one telephone set connected to the switching station via a plurality of radio...
EP0248351A2 Cordless telephone system.  
A cordless telephone system constituted by a switching station (1) connected to a cable telephone exchanger and at least one telephone set connected to the switching station via a plurality of...
Matches 1 - 50 out of 61 1 2 >