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...http://www.google.de/patents/US5117424?utm_source=gb-gplus-sharePatent US5117424 - Method and apparatus for setting clock signals to predetermined phases at remote broadcast sites in simulcast systems
