Patent ID: 6167097
Filing Date: 2000-12-26
Classification: H04L

Abstract:
A receiving apparatus comprising means for receiving a transmitted signal, decoding means for decoding the received signal, means for deriving a repetitive reference signal from the decoded signal, and clock signal generating means for generating a corrected clock signal within a predetermined frequency tolerance range in parts per million, said clock signal generating means comprising means for generating an uncorrected clock frequency signal having a more relaxed frequency tolerance range than said predetermined frequency tolerance range, and means for generating the corrected clock signal from the uncorrected clock frequency signal which comprises:clock frequency determining means for determining whether the corrected clock signal generated in respective time periods between successive reference signals varies relative to a predetermined value, said clock frequency determining means providing a control signal on an output, and frequency adjustment means responsive to the control signal for adjusting the frequency of the uncorrected clock frequency signal so that the frequency of the corrected clock signal is within the predetermined frequency tolerance range.