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EP1179231A1 |
Title is not available
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6061573 |
Method and apparatus in a radio communication system for synchronizing transmissions while maintaining full user traffic
A base station (214) synchronizes a data stream of a second transmitter (202) with that of a first transmitter while maintaining full user traffic through a radio communication system (200). The...
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5963098 |
FM canceler loop to reduce shock and vibration effects in crystal oscillators
A canceler loop is used to provide negative feedback to a crystal oscillator to reduce the effects of shock and vibration on the spectral purity of the crystal oscillator. The canceler loop...
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5912927 |
Multi-channel transmitter having an adaptive antenna array
A multi-channel transmitter (200) in accordance with the present invention overcomes the disadvantages of applying adaptive antenna array technology to multi-channel communication systems. The...
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5699354 |
Audio routing within trunked radio frequency multisite switch
A distributed trunked radio frequency (RF) switching network (multisite switch) distributes audio routing control information and digitized audio signals to communications interface modules (nodes)...
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5673006 |
Seamless switch-over frequency synthesizer
A frequency synthesizer having two atomic frequency standard inputs that is adapted to provide seamless switching or transition between the atomic frequency standard inputs with no change in the...
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5574970 |
Paging system providing continvous synchronization of simulcast delay
A paging system includes a satellite uplink (40) for assembling paging information and transmitting it to a satellite (26). The satellite (26) is then operable to transmit in a simulcast manner all...
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5526383 |
Network control system for controlling relative errors between network nodes
A network control system for eliminating a relative error among control signals transmitted from nodes provided in radio zones respectively, a mobil station moving among the radio zones, each of...
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5524029 |
Network control system for controlling relative errors between network nodes
A network control system for controlling a plurality of nodes respectively corresponding to, and provided in, a plurality of radio zones. Each node has a corresponding base station, where a mobil...
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5515401 |
Network control system for controlling relative errors between network nodes
A network control system for controlling a plurality of nodes respectively corresponding to, and provided in, a plurality of radio zones. Each node has a corresponding base station. A mobil station...
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5483665 |
Simulcast satellite paging system with over lapping paging reception locales
A paging system includes a satellite uplink (40) for assembling paging information and transmitting it to a satellite (26). The satellite (26) is then operable to transmit in a simulcast manner all...
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5481545 |
Conventional network interface for multisite RF trunking system
A gateway between a non-trunked ("conventional") RF communication system and digitally trunked RD communication system maps between trunked group IDs and non-trunked subaudible signalling tone...
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5423058 |
Simulcast transmission system with selective call tones
A simulcast radio transmission system (250) transmits message signals (318) including selective call tones, originating from a message source (202), to a geographical area (115). The simulcast...
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5398263 |
Autonomous pulse train timing controls for time-mark alignment
A phase lock loop (700) maintains a freewheeling capability while making phase corrections to a sample clock signal based on a precision timing signal. The phase corrections are dispersed over time...
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5392278 |
Distributed multisite system architecture
A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. Each transceiver covers a certain site area. The switch establishes audio communications...
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5287354 |
Data protocol and monitoring system for RF trunking multisite switch global serial channel
A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. Each transceiver covers a certain site area. The switch establishes audio communications...
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RE34540 |
Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system
A frequency modulated ratio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system...
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RE34499 |
Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system
A frequency modulated radio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system...
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5276442 |
Dynamic address allocation within RF trunking multisite switch
A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. The switch establishes audio communications between different sites and various dispatcher...
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5263177 |
Modified simulcast communication system
In simulcast systems, overlapping coverage areas (111, 113, 115, and 117) of base sites (101, 103, 105, and 107) result in distortion of the received signal to any communication unit (121 and 125)...
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5253253 |
Message bus slot update/idle control in RF trunking multisite switch
A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. The switch establishes audio communications between different sites and various dispatcher...
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5241537 |
Conventional base station interface architecture for RF trunking multisite switch
An interface for a conventional base station into a digitally trunked network of RF communications systems acts a pseudo-down link from a multisite switch to a trunked site controller. The...
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5239538 |
Controller architecture for RF trunking distributed multisite switch
A radio frequency (RF) signal transmission system is interconnected by a multisite switch that routes command and audio transmission signals between the RF systems. The multisite switch has a...
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5212807 |
Method of automatic path map generation for simulcast transmission system
A method of automatic path map generation (600) for use in a simulcast transmission system is disclosed which has at least three transmitter sites which form a first communication loop (403). The...
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5200954 |
Communication link between multisite RF trunked network and an intelligent dispatcher console
A communication link for a dispatcher console to a multisite network of RF digitally trunked radio site transceivers and other dispatcher consoles. The communication link provides the dispatcher...
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5081705 |
Communication system with external reference signal processing capability
The present invention comprises a communication system including a number of independently operating equipment modules in which the operations of these modules are referenced to a common external...
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5065450 |
Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system
A frequency modulated radio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system...
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5048116 |
Signal routing system
A signal routing system for use in cellular RF communications systems wherein a signal can be routed to different antennas, effectively switching transmitters between antennas. The switching is...
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5046128 |
Frequency equalized simulcast broadcasting system and method
A simulcast system (100) having remote sites (104) that can transmit a carrier signal (107) having a modulation signal imposed thereon, wherein both the carrier and the modulation signal are...
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5046124 |
Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system
A frequency modulated radio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system...
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5031230 |
Frequency, phase and modulation control system which is especially useful in simulcast transmission systems
A system enabling the frequency, and if desired, phase control of an oscillator which generates a standard signal useful as a carrier which is modulated by modulation signals. A multiplicity of...
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5003617 |
Simulcast broadcasting system and method
A simulcast broadcast system wherein two signals (103 and 106) intended for simultaneous broadcast are transmitted from a source site (100) to remote sites (200) discrete from one another. At the...
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4887050 |
Frequency control apparatus and method for a digital radio receiver
A frequency control apparatus and method is disclosed in which a frequency offset between a received signal and the local oscillator of a digital receiver is corrected in substantially one step.
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4850032 |
Simulcast data communications system
A data communications system (100) that communicates messages by way of a radio frequency (RF) channel between a network control processor (NCP 102) and subscriber radios (190) located anywhere in...
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4718109 |
Automatic synchronization system
An improved synchronization system for use with simulcast transmission systems is described. The invention provides a method and means for keeping the information signals for adjacent transmitters...
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4718108 |
Improved multiple site communication system
Disclosed is a communication system of the type adapted to communicate a message substantially simultaneously between a plurality of fixed location sites having respective radio coverage areas. The...
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4703520 |
Radio transceiver having an adaptive reference oscillator
A reference oscillator (21) suitable for use in a radio transceiver having a phase locked loop FM detector (12). During normal reception operation, the reference oscillator (21) can be controlled...
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4696052 |
Simulcast transmitter apparatus having automatic synchronization capability
A simulcast transmitter apparatus having automatic synchronization capability is disclosed which utilizes a signal readily available from any one of a number of available master timing sources to...
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4696051 |
Simulcast transmission system having automtic synchronization
An improved simulcast transmission system having automatic synchronization is disclosed which utilizes a signal from any one of a number of readily available master timing sources to maintain a...
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4670889 |
Frequency control for point to multipoint radio
A multipoint radio system has a single node which communicates with a plurality of outstations on one frequency. The outstations using a different single frequency to communicate with the node. The...
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4630283 |
Fast acquisition burst mode spread spectrum communications system with pilot carrier
A high frequency code division multiple access spread spectrum (CDMA SS) communications system includes multiple transmitters and their associated receivers, and a pilot carrier source. In order to...
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4608699 |
Simulcast transmission system
An improved simulcast transmission in which a signal transmitted by a master station provides a reference frequency signal, as well as a voice and data path, is described. The system can be...
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4578815 |
Wide area coverage radio communication system and method
A wide area coverage radio communication system of the type adapted to relay a message substantially simultaneously from a plurality of fixed location sites to a plurality of portable or mobile...
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4570265 |
Random frequency offsetting apparatus for multi-transmitter simulcast radio communications systems
Apparatus for randomly offsetting the frequencies of each transmitter in a simulcast radio communications system is described. The random frequency offsetting apparatus includes a random noise...
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4516083 |
Fast lock PLL having out of lock detector control of loop filter and divider
A phase-locked loop comprises a reference source that produces a signal at a fixed frequency that is applied to a phase detector. That signal is compared in the phase detector with a divided...
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