Patent ID: 8150693

Claim:
A speech recognition apparatus comprising: a combination of hardware and software configured to implement: an acoustic processor that converts an input analog speech signal into a digital signal; at least one memory that stores an acoustic model and a dictionary, the dictionary indicating appearance frequencies of words relative to other words and/or word sequences; and a recognizer that predicts a first word from the digital based on at least one other word and/or word sequence in a phrase recognized from the digital signal, wherein the recognizer calculates a probability value for the phrase including the first word using an appearance frequency indicated by the dictionary of the first word relative to the at least one other word and/or word sequence, wherein the recognizer does not predict the first word based on a second word that immediately precedes the first word in the phrase unless the second word belongs to a partial analysis tree that grammatically modifies or is grammatically modified by the first word in a sentence structure of the phrase.