Matches 1 - 50 out of 71 1 2 >
Match Document Document Title
7330150 Combined global positioning system receiver and radio  
A portable GPS/radio unit communicates over a wireless radio network with at least one other unit which is transmitting radio signals over the network indicative of that unit's location. The...
EP0997048B1 SYSTEM AND METHOD FOR PROVIDING INTERCOM AND MULTIPLE VOICE CHANNELS IN A PRIVATE TELEPHONE SYSTEM  
Abstract not available for EP0997048 Abstract of corresponding document: US6044268 A system and method for allowing intercom and multiple voice channel communication within a private telephone...
7196659 Combined global positioning system receiver and radio  
A portable GPS/radio unit communicates over a wireless radio network with at least one other unit which is transmitting radio signals over the network indicative of that unit's location. The...
7142900 Combined global positioning system receiver and radio  
A portable GPS/radio unit ( 10 ) communicates over a wireless radio network ( 12 ) with at least one other such unit. The unit ( 10 ) may transmit radio signals over the network ( 12 ) indicative...
6781962 Apparatus and method for voice message control  
A communication system and method are described. In one embodiment, the method comprises a server determining to examine contents of audio files in a storage facility, the server accessing one or...
6643512 Method and apparatus for spanning operation of a cellular telephone  
The apparatus and method of the present invention provides a system for spanning operation of a mobile station ( 110 ) between a public cellular system ( 100 ) for packet data service and a private...
6468588 Apparatus and method for application of a liquid or pasty medium onto a passing substrate  
An apparatus for application of a liquid or pasty coating medium onto a substrate moving past it, for instance a material web of paper, cardboard or boxboard or an applicator roll, includes a...
6381570 Adaptive two-threshold method for discriminating noise from speech in a communication signal  
A method of discriminating noise and voice energy in a communication signal. A signal is measured in a plurality of block periods, which are sampled to obtain a measurement of the block energy...
6049720 Link delay calculation and compensation system  
The present link delay calculation system using a common reference signal and a pulsed or gated tone signal to determine the link delay. The system using a discrete-time Fourier transform to...
6044268 System and method for providing intercom and multiple voice channels in a private telephone system  
A system and method for allowing intercom and multiple voice channel communication within a private telephone system employing a private base station and a multiplicity of standard cellular...
6009553 Adaptive error correction for a communications link  
A method of data transfer between a transmitter and a receiver over a communications link achieves maximum throughput by dynamically adapting a coding rate, and specifically an error correction...
5991309 Bandwidth management system for a remote repeater network  
A bandwidth management system for a remote repeater network for modifying a first signal to create a second signal within the bandwidth of a communications link, transferring the second signal...
5896560 Transmit control system using in-band tone signalling  
A transmit control system using in-band tones for activating and deactivating one or more remote sites. The transmit control system detecting energy in two or more spectral regions to determine if...
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...
5774803 Mobile device and regional information system  
A mobile device 1! receives a required piece of regional information. A regional information center 4! provides regional information. The mobile device 1!, a base station 2!, an exchange 3!,...
5764692 Dual mode radiotelephone modulator  
A dual-mode frequency and phase RF modulator (11) for use in a transmitter of a radiotelephone. A dual-mode modulation approach is employed wherein, in the analog (FM) mode of operation, a phase...
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...
5515397 PCM subcode communications technique between a regional radio transmitter/receiver and a regional switching center  
In a radiotelephone network, processing steps previously applied to digital voice transmissions received by a regional radio transmitter/receiver but not applied to analog voice transmissions...
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...
5392460 Dual mode radiotelephone terminal selectively operable for frequency modulated or phase modulated operation  
A dual-mode radiotelephone terminal includes a π/4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset...
5377256 Apparatus and method for a cellular freeway emergency telephone  
A self-contained cellular emergency roadside call box is disclosed without the use of external telephone lines. The call box is solar powered with battery storage and comprises a controller coupled...
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...
EP0346868B1 Time shared power amplifier  
Abstract of EP0346868 A time shared power amplifier for amplifying first and second modulated carrier signals for transmission. The carrier signals are modulated by first (35) and second (21) data...
RE34496 Apparatus and method for a cellular freeway emergency telephone service  
A self-contained cellular emergency roadside call box is disclosed without the use of external telephone lines. The call box is solar powered with battery storage and comprises a controller coupled...
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...
5212714 High speed data interface for land mobile communication system  
A high speed data interface unit that is fully compatible with existing, trunked, land mobile voice transceivers is provided. Data rates of up to 4800 baud using bilevel modulation are achievable...
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...
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...
5020076 Hybrid modulation apparatus  
A π/4-shift DQPSK modulator modulates a digitized voice signal and other information. An FM modulator modulates the analog voice signal and other information. The FM modulator is coupled to the...
4995055 Time shared very small aperture satellite terminals  
A time shared power amplifier for amplifying first and second modulated carrier signals for transmission. The carrier signals are modulated by first and second data signals, respectively. The first...
4955083 Dual mode radio transceiver for an SSB communication system  
A radio transceiver is disclosed for use in an SSB communication system having FM data capability. The dual-mode radio transceiver of the present invention includes a receiver capable of...
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...
4901348 Data transmission security arrangement for a plurality of data stations sharing access to a communication network  
An arrangement for securing data transmissions to and from one data device from among a plurality of data devices sharing a common interface is disclosed. In a data communication network, a master...
4899350 Signal communication capable of avoiding an audible reproduction of a sequence of information signals  
In a communication system for use in transmitting a sequence of information signals in addition to a sequence of digital voice signals subjected to adaptive delta modulation, the information signal...
EP0346868A2 Time shared power amplifier.  
A time shared power amplifier for amplifying first and second modulated carrier signals for transmission. The carrier signals are modulated by first (35) and second (21) data signals, respectively....
4882766 Terminal station of a radio communication network capable of effectively using radio channels assigned to the network  
For use in a common service area of a plurality of radio base stations, each being preassigned with a radio channel and for transmitting a channel status signal indicative of whether the radio...
4852086 SSB communication system with FM data capability  
A radio communications system is described in which analog voice signals are transmitted and received via single sideband amplitude modulation, and digital data signals are transmitted and received...
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...
4825457 Cellular network data transmission system  
A cellular network data transmission system including a digital communicator having a memory in which data is stored and an automatic dialer at a specific location for responding to an electrical...
Matches 1 - 50 out of 71 1 2 >