RE-TIMING SAMPLED DATA

摘要

For re-timing sampled data, input data samples at an input data rate are stored in a FIFO buffer and output at an output data rate according to an output clock that is locked to the input data rate in dependence on a loop-filtered measure of the fill level of the said buffer. The frequency of the output clock is additionally controlled by an estimate of the input data rate.

主权项

1. A method of re-timing sampled data in a digital data processing system, the method comprising the steps of:
receiving input data samples at an input data rate; storing said input data samples in a FIFO buffer having a fill level; forming a loop-filled measure of said fill level; forming an estimate of the input data rate; controlling the frequency of an output clock in accordance with said loop-filtered measure and said estimate; outputting data samples from the FIFO at an output data rate determined by the output clock.