Motorola Corporation

William R Dirkes

Stephen Michael Bench

James C Secora

Manohar A Joglekar

Michael A Stepien

Manohar A Juglekar

Michael A Stephen

A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks have N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.

Clock circuitry for a data communication system

Data communication system with random and burst error protection and

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Mundelein, IL, United States of America

William R Dirkes