Patent ID: 8223798
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A receiver, comprising: a data structure storing a plurality of sets of tap coefficients for a digital filter, each set of tap coefficients corresponding to a respective phase; an input configured to receive an input data stream having a variable data rate; a tracking loop configured to compare an externally sourced reference time signal with a local time reference and to generate phase information corresponding to a relative phase of the local time reference and the externally sourced reference time signal based on the comparison, wherein the local time reference includes a local frequency reference having a fixed frequency that corresponds to a fixed data rate for an output data stream of the receiver and that is independent of the externally sourced reference time signal; a phase accumulator coupled to the tracking loop and configured to receive and accumulate the phase information generated by the tracking loop, and to output a control signal corresponding to the accumulated phase information; and a sample rate converter coupled to the phase accumulator and including the digital filter, wherein the sample rate converter is configured to receive the control signal, retrieve from the data structure a set of tap coefficients of the digital filter that correspond to the accumulated phase information in accordance with the control signal, and sample the input data stream using the digital filter with the set of tap coefficients retrieved from the data structure to generate the output data stream having the fixed data rate.