Reference Clock Recovery Apparatus and Method

摘要

A reference clock recovery apparatus is provided and includes a tuning unit for receiving a modulated signal and converting the modulated signal into a digital value; a first frequency difference detecting unit for detecting a frequency difference between the central station and a terminal; first and second filtering unit for smoothing the frequency difference; a second frequency difference detecting unit for causing the terminal to maintain a synchronization to the cl.ock of the central station; a switching unit for selecting an operation of the first frequency difference detecting unit or an operation of the second frequency difference detecting unit; an digital-to-analog converting unit for converting a digital signal into an analog signal; an oscillating unit for receiving an output of the digital-to-analog converting unit and outputting a desired frequency; a counting unit for counting the clocks and outputting the count value; and a transmitting unit for transmits the timing information.