Method and apparatus for setting clock signals to predetermined phases at remote broadcast sites in simulcast systems
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United States of America Patent
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May 26, 1992
Issued Date -
N/A
app pub date -
Oct 26, 1990
filing date -
Jul 20, 1989
priority date (Note) -
Expired
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Abstract
A coherency generator for providing signals to control the time and phase coherency of data information signals in an overlap region of a simulcast system that comprises a control site and a plurality of remote broadcast sites. A channel card located at each remote site derives from the information signals a master clock signal for synchronizing the broadcast of data information on an RF carrier. At substantially regular intervals a transmit section of the coherency generator transmits a synchronization command signal after detecting a predetermined sequence of ones or zeros. A receive section of the coherency generator issues a reset pulse to the remote site channel card upon detecting a predetermined pattern of values of a preselected data bit, and following detection of the synchronization command pulse. The reset pulse clears the memory elements of the channel card, setting the phase of the clock signal.
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