17. The method according to claim 14 wherein applying said emphasis function comprises multiplying by a weight.
17. The method according to claim 14 wherein applying said emphasis function comprises multiplying by a weight. 18. The method according to claim 17 wherein: for each k th item of training data in said subset of said plurality of training data items: said transcribed identity and said recognized identity are compared to determine if a type of error selected from a group consisting of an insertion error, a deletion error and a substitution error has occurred; a first predetermined value is used as said weight if an insertion error has occurred; a second predetermined value is used as said weight if a deletion error has occurred; and a third predetermined value is used as said weight if a substitution error has occurred.