Patent ID: 7848927

Claim:
A speech recognition device which recognizes a speech signal and outputs a result of the recognition, said speech recognition device comprising: a language model storage unit which stores a language model indicating appearance probabilities of words or word sequences; a recognition unit which: extracts a feature amount of the inputted speech signal; identifies a word or word sequence corresponding to the speech signal by checking the extracted feature amount with the language model stored in said language model storage unit; and outputs the identified word or word sequence as the result of the speech recognition; a word obtaining unit which obtains a word from outside said speech recognition device; and a language model adjusting unit which adjusts using a processor, the language model by varying the appearance probability indicated by the language model according to time elapsed after said word obtaining unit obtains the word so as to maximize the appearance probability after a predetermined elapsed time, wherein said recognition unit identifies the word or the word sequence using the language model adjusted by said language model adjusting unit.