34. An apparatus as claimed in claim 30 wherein said comparator means is operable to determine a ranking score for each standard character of said portion, corresponding to the closeness of match with the incoming character code, and said apparatus further comprises an exact match testing means connected between said comparator means and said character generator means, for receiving a highest said ranking score and determining whether said score corresponds to an exact match, and in the event of an exact match, directing the exactly matched standard character code to an output of said apparatus, by-passing said selector means.
34. An apparatus as claimed in claim 30 wherein said comparator means is operable to determine a ranking score for each standard character of said portion, corresponding to the closeness of match with the incoming character code, and said apparatus further comprises an exact match testing means connected between said comparator means and said character generator means, for receiving a highest said ranking score and determining whether said score corresponds to an exact match, and in the event of an exact match, directing the exactly matched standard character code to an output of said apparatus, by-passing said selector means. 35. An apparatus as claimed in claim 34 further comprising alarm means connected to said apparatus after said match testing means, for providing alarm indication in the event that there is no exact match.