Method and apparatus for setting clock signals to predetermined phases at remote broadcast sites in simulcast systems
US5117424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2625
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.