Harris Corporation

David F Hayes

Peter John Poggi

George D Helm

William Skiba

Anthony Keane

Richard E Rzepkowski

Roger Pawlowski

Kenneth L Hagstrom

Christopher Percival

Michael Barnes

A cellular mobile telephone system and method in which channel assignment and telephone call routing are controlled by a central control station and in which each communications channel is separately controlled at a cell station by a radio interface module ('RIM') associated therewith. Flexibility and security from operational interruptions is provided by dynamic assignment of identical RIMs to monitoring, paging, control and communication functions at the cell station. The system is modular and may be customized to accommodate geographic and demographic considerations, while permitting expansion and modification without obsolescence. The system also includes novel, self-diagnostic testing loops and methods. A novel mobile telephone is also disclosed.

Cellular mobile telephone system and method

A programmable frequency and signalling format encoder/decoder circuit is disclosed which can be used alone or with other like encoder/decoder circuits and external timing and memory circuits to create a tone frequency transmission and reception system having particular frequency and signal format requirements. The encoder provides a sine wave output signal of a selected frequency by constructing the sine wave shape from a predetermined number of sine wave weighted discrete signal segments for each output signal cycle. The width of the segments within a given output signal cycle is determined by programming the encoder with data representative of the selected frequency. To ensure accurate conformance of the frequency of the output signal with a selected frequency, the encoder further includes circuitry for varying the width of individual segments within a single output signal cycle in accordance with the selected frequency. A programmable timing circuit particularly suited for controlling operation of one or more encoder/decoder circuits is also disclosed.

Programmable frequency and signalling format tone frequency

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Webster, NY, United States of America

David F Hayes