Alphanumeric message composing method using telephone keypad

H - Electricity – 04 – M

Patent

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Details

H04M 1/515 (2006.01) G06F 3/02 (2006.01) H04M 1/247 (2006.01) H04M 11/00 (2006.01) H04Q 7/16 (2006.01)

Patent

CA 2333293

An interactive method for composing an alphanumeric message by a caller using a telephone keypad includes storing (215) a lexical database (135) from which a plurality of words can be recovered; storing a received sequence of key codes (405) representing a sequence in which keys on a telephone style keypad are keyed; and generating a word trellis including candidate words (415) derived from the sequence and the lexical database. In one aspect of the method, a most likely phrase (420) is formed from a trellis of the candidate words using conditional probabilities stored in the lexical database. In another aspect, keypad error correction is performed when a candidate word is not found in the lexical database. In another aspect, caller responses are used to determine a correct word when all candidate words of a subset of candidate words are incorrect.

L'invention porte sur un procédé interactif permettant à un appelant de composer un message alphanumérique à l'aide d'un clavier téléphonique. Ce procédé consiste à enregistrer (215) une base de données (135) lexicale de laquelle on peut extraire une pluralité de mots; enregistrer une séquence reçue de codes (405) d'identification représentant une séquence au cours de laquelle on presse les touches du clavier de type téléphonique; et générer des mots en treillis tels que des mots candidats (415) dérivés de la séquence et de la base de données lexicale. Selon une autre variante, on effectue une correction d'erreur au clavier lorsqu'un mot candidat n'est pas trouvé dans la base de données lexicale. Dans une autre variante, les réponses des appelants sont utilisées pour déterminer un mot correct lorsque tous les mots candidats d'un sous-ensemble de mots candidats sont incorrects.

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