10. A method of assigning a pre-filtering class to a word when adding a word to a speech recognition dictionary, the comprising: performing a direct look-up of a first phoneme of the word in a database of classified words organized alphabetically by their phonemes, matching the first phoneme of the word to a first word in the database having the same first phoneme, selecting the first word in the database having the same first phoneme and following words in the database to form a sub-list, matching the first phoneme of the word to the first phoneme of the classified words in the sub-list to form a class list, and placing the word in the class list.
14. The method of claim 10 wherein the step of selecting includes selecting the first word in the database having the same first phoneme and 199 following words in the database to form the sub-list.