Matches 1 - 47 out of 47
Match Document Document Title
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
4815073 Accessing of transmission channels of a communication system  
In a communications system with a plurality of subscriber stations independent of each other, where each subscriber station can access a joint duplex transmission channel according to a multiple...
4677653 Cellular mobile phone with a plurality of accessing telephone numbers for allowing access to the mobile phone by any one of the telephone numbers  
An adapter for a cellular mobile phone unit which converts the unit to include a plurality of telephone numbers. A main circuit board is coupled to a microprocessor of the unit, which board...
EP0136167A2 Ringing signal transmissio  
4486624 Microprocessor controlled radiotelephone transceiver  
An improved radiotelephone includes a unique microprocessor and peripheral devices for controlling the operation of portable or mobile radio transceivers in a cellular-type radiotelephone system....
4467141 Telecommunication system with radio line  
A mobile subscriber station served by a telephone network is coupled by a radio link with an individually associated stationary relay station directly connected to that network. The tow stations...
4434461 Microprocessor with duplicate registers for processing interrupts  
A unique microprocessor for controlling portable and mobile cellular radiotelephones is architectured to process high speed supervisory signalling, while also minimizing power drain. The...
4398265 Keyboard and display interface adapter architecture  
A unique interface adapter is coupled to a microprocessor by a three-wire self-clocking serial data bus for accommodating a twenty-key keyboard and an eight-digit display. The interface adapter...
4390963 Interface adapter architecture  
A unique interface adapter is described which includes circuitry for recovering a clock signal and a non-return-to-zero (NRZ) data signal from a data signal transmitted on two forward data signals....
EP0073014A2 Method of accessing transmission channels of an information transmission system.  
Abstract not available for EP0073014 Abstract of corresponding document: US4815073 In a communications system with a plurality of subscriber stations independent of each other, where each...
4275271 Sub-miniature radio telephone decoder  
Presented herein is a sub-miniature radio telephone decoder which through a unique arrangement of integrated circuits adapted to create frequency detectors and counters provide the means whereby a...
4220820 Control circuitry for a radio telephone  
A control circuitry for a radio telephone having a transmitter, a receiver, a cradle and a handset. The handset includes a first computer having a stored program control therein, a first memory, a...
EP0011063A1 Portable radiotelephone system.  
A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated,...
4122304 Control circuitry for a radio telephone  
A control circuitry for a radio telephone having a transmitter, a receiver, a cradle and a handset. The handset includes a first computer having a stored program control therein, a first memory, a...
4092597 Confirmation circuit for a two-way communication system  
A two-tone decoder decodes simultaneously at least two calling tones each having different frequencies coupled from a calling station to a called station and produces a first control signal upon...
4012596 Telephone patch  
Electronic patch circuitry interconnects a wire telephone line with the base station transmitter and receiver of a simplex two-way radio communication system, for causing VOX-type operation with...
3946315 Single frequency signalling in a radiotelephone communication system with idle condition signal generator at one terminal activated by another terminal  
Single frequency signaling system which simulates the low level tone during the idle circuit condition even though the radio frequency carriers in the transmission link through a repeater have been...
3859475 DECODER CHANNEL SELECTOR AND ENUNCIATOR SYSTEM IN AN AIRBORNE RADIOTELEPHONE SYSTEM  
An airborne radiotelephone system with push-to-talk operation that does not require the transmitter to be on continuously during a call. The system is all solid state with an electronic decoder...
3840811 DUPLEXER TYPE RADIO-TELEPHONE DATA RECEIVER AND TRANSMISSION SYSTEM  
A radio-telephone system embodying a duplexer network whereby a request for computerized data may be transmitted to a base station and the data received from the base station through a single...
3836726 DATA TRANSMISSION METHOD AND APPARATUS  
A plural transmitter, digital data transmission and remote control system in the environment of a paging system in which mutual interference by the transmitters is eliminated through the sequencing...
3806663 RADIO TELEPHONE SUBSCRIBER UNIT  
Disclosed is a radio telephone subscriber unit for communicating with a telephone company base terminal wherein control signals are transmitted between the base terminal and the subscriber unit for...
3729595 RADIOTELEPHONE SYSTEM WITH CENTRAL OFFICE HAVING INDIVIDUAL PROCESSORS ASSIGNABLE TO RESPECTIVE MOBILE UNITS ABOARD COMMUNICATING VEHICLES  
A central office, designed for short-wave radiocommunication with mobile units aboard several vehicles in its area, has a plurality of fixed processing units operating on different frequency...
3714574 MOBILE COMMUNICATION SYSTEM  
A mobile communication system in which many base stations are disposed along the path of a moving body and are successively switched over as the moving body moves along its path, and a plurality of...
3634627 CHANNEL-ALLOCATION SYSTEM FOR A CHANNEL-ADDRESSING MULTIPLE-ACCESS TELECOMMUNICATION SYSTEM  
In a channel-addressing multiple-access telecommunication system, a channel-allocation system is disclosed in which all stations scan the available channels. An available channel is seized by...
3590166 METHOD OF AUTOMATICALLY ESTABLISHING TELEPHONE CONNECTION TO AND FROM MOBILE RADIOTELEPHONE STATIONS  
A method of automatically establishing connections between mobile and fixed radiotelephone stations through fixed duplex channels wherein connections are made from the fixed station on a single...
3586978 TOUCH CALLING RADIO TELEPHONE TERMINAL  
A circuit designed to provide an interface between a private automatic telephone exchange and a base radio station serving mobile radio units equipped with touch calling units. The base radio...
3581019 CARD CONTROL OF RADIO TELEPHONE  
Card control of radiotelephone facility. A matrix circuit receives a card, which is apertured, punched or embossed in accordance with the number which the radiotelephone equipment is to respond,...
3571519 SYNCHRONOUS SUPERVISORY UNIT FOR MOBILE TELEPHONE SYSTEM  
A synchronous supervisory unit for mobile telephone operation is capable of assuming any one of a plurality of states depending upon the operations to be carried out by the supervisory system. A...
Matches 1 - 47 out of 47