| 摘要 |
The present invention provides a method and apparatus for providing program clock reference (PCR) data to various devices in a digital transmission system in a robust manner. According to the present invention, PCR data representative of a snapshot of the system clock is encoded only an existing frequency reference signal. The frequency reference signal is a signal to which all clock dependent components lock to ensure that the proper frequency lock is used. By encoding the frequency reference with PCR data, effectively using the frequency reference as a PCR carrier wave, the PCR is efficiently and robustly delivered to the various devices requiring this PCR data.
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