Synchronizing signals in a communication system may include determining the amount of data stored in a buffer, comparing the amount of data to a plurality of threshold levels and adjusting a speed of a clock used for decoding the data based on the comparing. The signals to be synchronized may correspond to a decoder clock in a set top box and to an encoder clock in a head end. The data in the buffer may correspond to packets of data corresponding to compressed audio and video information. The process may also include decoding information based on the clock and slew limited limiting the clock may. The process may further include setting at least one threshold to a calibration threshold during a calibration mode and a post-calibration threshold during a post-calibration.