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7209992 |
Graphics display system with unified memory architecture
A graphics display system integrated circuit is used in a set-top box for controlling a television display. The graphics display system processes analog video input, digital video input, and graphi...
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6804529 |
Trunked radio repeater communication system including home channel aliasing and call grouping
A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisi...
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6529486 |
Trunked radio repeater communication system
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interco...
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6374115 |
Method and apparatus for trunked radio repeater communications with backwards compatibility
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interco...
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5835535 |
Data bus interface apparatus which measures voltage potential on the uplink line of the data bus and removes an AC component
The data bus interface apparatus (243) which interfaces between one of a plurality of peripheral units (111) and a data bus (109). The data bus interface driver (243) is capable of biasing data to ...
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5815799 |
Priority system for a wide area transmission trunked communication system
A method and apparatus for providing priority access for users in a transmission trunked communication system, including a plurality of distributive radio network terminal (RNT) switches and a uniq...
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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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5613196 |
Method and apparatus for a distributive wide area network for a land mobile transmission trunked communication system
A land mobile transmission trunked communication system is provided with a unique switching protocol arrangement among repeaters that are networked to one or more external communication networks. T...
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5566388 |
RF trunking multisite switch configuration and diagnostics interface
In a multisite radio frequency (RF) signal transmission system, a multisite switch routes audio and data information throughout the system. This switch has a node through which a system manager and...
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5548802 |
Method and apparatus for a remote network switch for a land mobile transmission trunked communication system
A method and apparatus for distributively interconnecting a plurality of land mobile trunked transmission communication systems into a wide area network includes a plurality of distributive radio n...
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5535212 |
Implicit token media access protocol without collision detection
If a transceiver has a message to send during an idle medium condition, it transmits a jam pattern onto the medium for a predetermined time (based on maximum network propagation delay). If a transc...
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5519874 |
Application execution control method and system for servicing subscribers via a switchboard connected to a computer using an application management table
A subscriber terminal service system, which has a switchboard connected to a plurality of subscriber terminals and a computer connected with the switchboard and executes services to subscribers, ha...
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5465386 |
Signaling protocol for a distributive wide area transmission trunked communication system
A land mobile transmission trunked communication system is provided with an enhanced control signal protocol. The land mobile transmission trunked communication system includes a plurality of trans...
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5436901 |
Synchronous time division multiplexing using jam-based frame synchronization
If a transceiver has a message to send during an idle medium condition, it transmits a jam pattern onto the medium for a predetermined time (based on maximum network propagation delay). If a transc...
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5384776 |
Audio routing within trunked radio frequency multisite switch
A distributed trunked radio frequency (RF) switching network (switch) distributes audio routing control and processing throughout the switch, thus avoiding a centralized mixing matrix, increasing f...
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5365512 |
Multisite trunked RF communication system with reliable control messaging network
A distributed switching network (switch) routes audio and control signals throughout the switch from various audio sources to one or more audio destinations. Audio sources such as mobile/portable r...
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5297142 |
Data transfer method and apparatus for communication between a peripheral and a master
Data transfer apparatus (211,213) for a radiotelephone peripheral using a time multiplexed data bus for communication with a bus master of the radiotelephone couples peripheral devices external to ...
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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 be...
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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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5237570 |
Prioritized data transfer method and apparatus for a radiotelephone peripheral
A radiotelephone data transfer apparatus connects peripheral devices external to the radiotelephone and other user information inputting devices, such as a handset for a cellular mobile radioteleph...
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4955019 |
Multimedia information exchanging system and equipment therefor
A multimedia information exchanging system in a digital exchange network that has an exchange system in which channels are selectively assigned for communication among a plurality of subscribers. T...
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4888766 |
Multi-terminal control system
A communication control method of a communication system including a network, such as an ISDN network, and a plurality of main interconnection buses connected to the network through respective conn...
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4763320 |
Method and arrangement for transmitting data, especially in an aircraft
A method and arrangement for the transmission of data, in digital form, in a bus system, which includes a central unit, several stations, as well as a bus line or data bus. During operation, the fo...
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4725838 |
Method for processing analog output signals from current and voltage transducers and facility for carrying out the method
Analog output signals from decentralized transducers for current and voltage are sampled with timing patterns generated at a decentralized location and are transmitted to a central evaluating facil...
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