| 摘要 |
An NTSC (National Television Systems Committee) co-channel interference detector includes at least a carrier tracking loop (125), peak detector (180) and a D/U (Desired-to-Undesired) signal power ratio estimator (185). 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.
|
