A technology that can reduce the visual effect of multipath propagation and eliminate ghosts has been developed by the Broadcasting Technology Association of Japan (BTA). It was recently field-tested using over-the-air television signals. The BTA technology was effective in eliminating or reducing ghosts in nearly all the locations surveyed. The amount of improvement varied depending on the type and complexity of the ghosting impairment, but, in general, it was on the order of two steps, as measured on a five-step CCIR impairment scale. The technology was most effective in correcting static or nonvarying ghosting conditions, and least effective in the case of time-varying or rapidly changing propagation conditions.
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