Abstract: A receiver comprises a carrier tracking loop (CTL), a filter, a look-up table and a rotator The CTL provides a base-band signal having in-phase and quadrature signal components. The filter provides a DC-offset level associated with each component to the look-up table, which, in response thereto, provides a phase adjustment signal to the rotator The latter then rotates the baseband signal as a function of the phase adjustment signal for correcting for carrier phase ambiguity.

Abstract: An NTSC (National Television Systems Committee) co-channel interference detector includes at least a carrier tracking loop, peak detector and a D/U (Desired-to-Undesired) signal power ratio estimator. The carrier tracking loop provides a tracking signal representative of the possible presence of a video carrier of an interfering NTSC video signal while the peak detector provides peak data derived from the tracking signal to the D/U signal power ratio estimator. The latter provides, as a function of the peak data, an estimate of a D/U signal power ratio with respect to a desired ATSC (Advanced Television Systems Committee) co-channel signal.

Abstract: An ATSC (Advanced Television Systems Committee) VSB (Vestigial Sideband) receiver includes a carrier tracking loop (CTL) for processing a received ATSC VSB signal and a CTL lock detector. The CTL lock detector includes an averaging filter for averaging the down-converted received ATSC VSB signal to provide a DC offset, an estimator for providing an estimate of the DC offset, and a comparator 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.