A seat back video display assembly adapted to be positioned in the back of a vehicle seat having an outer skin cover. The sound wave generator includes a base structure and a conductive material located on the base structure. The apparatus also includes a signal analyzer that is configured to analyze the detected interference signal. A ratchet assembly in driving engagement with the gear train transmits a rotational drive in only a single direction. A free format token analysis of the addresses may also be performed in parallel with, before, or after, the contextual identification, and a free format matching score may be calculated.