Matches 1 - 50 out of 59 1 2 >
Match Document Document Title
6947765 Method for transmitting data between data processing means and a radio communication network, module and mobile terminal for implementing same  
A data transmission module for transmitting data between a radio communication network that transmits data at a specified rate and data processing means includes network interface radio means for...
6621813 Methods and apparatus for synchronization in a wireless network  
A method of synchronizing a base station and a remote station is presented. The base station is communicatively coupled with the remote station and a reference network. The base station clock...
6522877 Methods and apparatus for providing an interactive cell broadcast service  
A method is disclosed for operating a cellular communications system of a type that comprises a Base Station/Mobile Switching Center/Internetworking function (BMI) and a plurality of mobile...
6298248 Base station apparatus and frame synchronization acquisition method  
Before ordinary communications are started, a base station apparatus of the present invention connects antenna 101 for use in acquiring frame synchronization to selector 105 by the control of...
6243372 Methods and apparatus for synchronization in a wireless network  
As part of a preferred communication protocol, base stations which are synchronized to a PSTN of a wireless communication network, periodically transmits a preamble. A remote detects the preamble...
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...
5831679 Network for retrieval and video transmission of information  
Signal processors for permitting the transparent, simultaneous transmission and reception of a volume of information in the video bandwidth is disclosed. The volume of data is selected in response...
5809417 Cordless telephone arranged for operating with multiple portable units in a frequency hopping system  
A cordless telephone arranged for operation in a frequency hopping system includes an arrangement which achieves optimum utilization of multiple cordless telephone portable units by permitting...
5666168 System for transmitting facsimile data in the upper vestigial chrominance sideband of a video signal  
The instant application is directed to a cable facsimile machine which implements the upper vestigial chrominance sideband of a standard video signal for data transmission. Signal processors for...
5617148 Filter by-pass for transmitting an additional signal with a video signal  
A controlled element for spectrum attenuation or a controlled filter is disclosed that is used to aid in the insertion of a secondary signal into a video signal without distorting the blanking...
5612681 Data transmission system having dedicated clock channel  
The clock demodulator 25 continually demodulates the clock signal of the control CPU 7 transmitted from the clock modulator 10 of the center S. The terminal control CPU 23 performs processes such...
5608755 Method and apparatus for implementing carrierless amplitude/phase encoding in a network  
A method and apparatus for (1) transmitting large amounts of data between a least a first and second station over a twisted pair, (2) reducing cross talk in a network using carrierless amplitude...
5587743 Signal processors for transparent and simultaneous transmission and reception of a data signal in a video signal  
Signal processors for permitting the transparent, simultaneous transmission and reception of a data signal in the video bandwidth is disclosed. The signal processor in the transmitter rasterizes...
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...
5572247 Processor for receiving data from a video signal  
Signal processors for permitting the transparent reception of a data signal in the video bandwidth of a cable television system is disclosed. The received signal has video and data components that...
5559559 Transmitting a secondary signal with dynamic injection level control  
A secondary signal is processed and injected into a primary video signal. The injection level of the secondary signal is dynamically controlled to reduce transmission errors in the secondary...
5557333 System for transparent transmission and reception of a secondary data signal with a video signal in the video band  
Signal processors for permitting the transparent, simultaneous transmission and reception of a secondary data signal with a video signal in the video band is disclosed. The signal processor in the...
EP0267280B1 INTERACTIVE TELEVISION AND DATA TRANSMISSION SYSTEM  
Abstract not available for EP0267280 Abstract of corresponding document: US4750036 A spread spectrum system provides bidirectional digital communication on a vacant television (TV) channel for...
5410360 Timing control for injecting a burst and data into a video signal  
A secondary signal is processed and injected into a primary color video signal. The timing of the subsequent transmission of the secondary signal is controlled by timing signals. The timing signals...
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...
5408517 Method and apparatus for handoff synchronization  
A communication system (100) comprises a central controller (102), a plurality of base stations (104 and 106) coupled indirectly via the central controller and using radio frequency waves to...
5387941 Data with video transmitter  
Signal processors for permitting the transparent, simultaneous transmission and reception of a data signal in the video bandwidth is disclosed. The signal processor in the transmitter rasterizes...
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...
5327237 Transmitting data with video  
Signal processors for permitting the transparent, simultaneous transmission and reception of a secondary data signal with a video signal in the video band is disclosed. The signal processor in the...
5321514 Interactive television and data transmission system  
A spread spectrum system provides bidirectional digital communication on a vacant television (TV) channel for simultaneous use by more than 75,000 subscribers using time and frequency division...
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...
5245634 Base-site synchronization in a communication system  
A central-site (100) has located within it a synchronization system for purposes of backing-up a GPS external synchronization system. The central-site (100) is coupled to a plurality of base-sites...
5239672 Synchronization method and apparatus for simulcast transmission system  
A method of synchronizing a plurality of remote site transmitters (200) in a digital simulcast transmission system is described that enables use of four-level modulation on two-level modulation...
5229996 Split-window time alignment  
Synchronization is maintained between a regional radio transmitter/receiver and a remote transmitter/receiver communicating across a TDMA channel by detecting time misalignment of communications...
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...
5172110 Indicator apparatus for the recovery of skiers buried by avalanches  
Indicator apparatus used for recovery of skiers buried by avalanches, includes cooperating transmitters and receivers carried by skiers and by search and rescue personnel. The indicator device...
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...
5124985 Radiocommunication system using time-division digital frames  
A radiocommunication system comprising a base station and a plurality of terminal stations. The base station includes a transmitting section for arranging a plurality of digital frames on a...
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...
5089815 Vehicle communication system using existing roadway loops  
A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as...
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...
4876742 Apparatus and method for providing a wireless link between two local area network systems  
In a data processing system network, apparatus and method are disclosed for coupling two local area networks by means of a wireless link. Typically, two local area network (LAN) systems are coupled...
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...
4756010 Asynchronous/synchronous data receiver circuit  
In a communications system wherein a transmitted message is preceeded only by an address, an asynchronous circuit detects the address and provides an initializing signal to a synchronous clock...
Matches 1 - 50 out of 59 1 2 >