Television signal deghosting by noncausal recursive filtering

A signal corrupted by a ghosting channel can be deghosted by the appropriate inverse system. If the channel is nonminimum-phase, the inverse system has a noncausal impulse response. It is pointed out that the inverse system can be implemented with recursive digital filters, provided there are system elements to time-flip the signal. Such noncausal recursive filtering has advantages over strictly causal recursive filtering in its ability to equalize the phase as well as the magnitude response of the channel. It also has advantages over nonrecursive nonminimum-phase deghosting in that it requires much lower filter order