A CARRIER TRACKING LOOP LOCK DETECTOR

摘要

An ATSC (Advanced Television Systems Committee) VSB (Vestigial Sideband) receiver (15) includes a carrier tracking loop (CTL) (115) for processing a received ATSC VSB signal and a CTL lock detector (200). The CTL lock detector includes an averaging filter (135) for averaging the down-converted received ATSC VSB signal to provide a DC offset, an estimator (130) for providing an estimate of the DC offset, and a comparator (140) for providing a lock signal as a function of a comparison between the estimate of the DC offset and the DC offset, wherein the lock signal is representative of either a locked condition or an unlocked condition of the CTL.