| 摘要 |
A method of minimizing throughput delay in constant-bit-rate services carried over packet-based networks subject to variable delays, comprises, in one embodiment, the steps of receiving incoming packets in a buffer, reading out bits from the buffer at a clock frequency fi, continually monitoring the buffer fill level Li, determining the maximum fill level Lmaxj over a plurality of successive samples, determining the minimum fill level Lmink over a plurality of successive samples, adjusting the clock frequency fi to cause the maximum fill level Lmaxj to tend toward a target value TargetLmax, and adaptively changing said target value TargetLmax so that the minimum fill level Lmink tends toward a predetermined set-point. The rate of change of the target value TargetLmax is significantly slower than the rate of adjustment of clock frequency. The invention can be applied to other types of clock recovery. |
