Motorola Corporation

Other

James A Henderson, Jr

John W Maher

Theodore M Bloomstein

Greg M Townsend

James H Errico

Russell A Marten

James M Connor

Daniel C Scavezze

Chris B Tennant

An operator MUX interface (OMI) (102) includes a data base manager (203) that manages at least two data bases. The first comprises a substantially non-temporary data base, and the second comprises a substantially temporary data base. The latter includes information from both the first data base, and other information as well. The data base manager (203) automatically alters the data storage structure of the second data base whenever either the data storage structure for the first data base is changed, or whenever new information must be added to the second data base, and the data storage structure of the second data base will not readily accommodate that addition.

Database management system having first and second databases for

The present invention discloses a communication system network that comprises a plurality of communication systems and a processing multiplexer. The communication systems, which may be either conventional communication systems and/or trunked communication systems, transmit digitized audio signals and communication system data to the processing multiplexer. Based on signal destination data, which is part of the communication system data, the processing multiplexer processes the digitized signals and routes the resultant signals to the appropriate signal destinations of the communication systems.

Communication system network interconnecting a plurality of

Method and apparatus are provided for bi-directional audio and data communications enabling a time-division multiplex control center system and distributed system intelligence enabling efficiency and reliability.

Time-division multiplex communications control system

The communications system may include wireless two-way communications equipment having selectable functions and various operational features. Control modules each include mechanisms for providing indicia representative of the status of the features of the communications equipment and mechanisms for generating data for controlling the functions to be selected on the communications equipment. A group of the control modules are coupled to a panel module which selectively communicates with each of the control modules in the group. An interface circuit is coupled to a plurality of the panel modules for selectively communicating with each; the interface circuit includes a microprocessor for writing indicia data to each of the selected control modules via the selected panel module and reads the control data generated by the control modules. The periodic scanning and reading of information is utilized to ascertain changes in the data.

Remote data controller for a communication system

An integrated circuit protection device for use with a voltage regulator used to drive an integrated circuit to prevent damage to the integrated circuit which goes into a 'latch up' condition. The integrated circuit protection device comprises a first switching circuit, connected to the output of the voltage regulator for selectively connecting the output of the voltage regulator to ground and a second switching circuit, connected to the input and the output of the voltage regulator and to the first switching circuit, for detecting a 'latch up' condition and for selectively activating the first switching circuit upon detection of a 'latch up' condition, whereby the first switching circuit connects the output of the voltage regulator to ground and resets the integrated circuit to prevent damage thereto. A predetermined time after the 'latch up' condition is detected, normal operation is automatically restored. In another embodiment, the first switching circuit is included in an adjustable voltage regulator, but is still controlled by the second switching circuit as described hereinbefore. In still another embodiment the protection circuit monitors the input current drawn by a voltage regulator and cuts the current thereto when the current exceeds a predetermined value caused by the 'latch up' condition of the integrated circuit. The output of the voltage regulator drops to zero and clears the integrated circuit.

Integrated circuit protection circuit

The remote digital volume control system (10) as used in an audio control apparatus comprising at least one multidigital/audio slot bus (12) which is coupled to base stations through interfaces (21-24). Console interfacing circuits (38) are coupled to the bus (12) and a plurality of remote consoles (30) each with channel control panels (32) coupled to the interfacing circuits (38). The system (10) comprises channel control modules (102) and shared A/D circuitry (150) including two comparators (152, 153) and an up/down counter (154) for generating a four-bit word for each volume control setting of each channel control module (102). The remoted interfacing circuits (38) coupled to said bus include a RAM (180) for storing volume level information for each channel control module (102) and routing information, and a timing control circuit (182) for routing information from the respective digital/audio slots on the bus (12) to audio line driver circuits (71-74) in the consoles (30). The remoted interfacing circuits (38) are controlled by the RAM (180), the timing control circuit (182), and a microprocessor (36) which cause appropriate digital/audio slot information to be converted to an analog signal, muted to the desired level, and routed to a desired audio line driver circuit (71-74) coupled to a speaker (91-94) in a desired console (30).

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Streamwood, IL, United States of America

James A Henderson, Jr