Patent ID: 7392188
Filing Date: 2008-06-24
Classification: G10L

Abstract:
1. A method of suppressing speech recognition errors in a speech recognition system, said method comprising the steps of: receiving an input signal that comprises at least one user-generated command word and an echo from an outgoing system voice prompt, wherein at least one word of the outgoing system voice prompt is included in the echo received in the input signal; generating an acoustic model of the outgoing system voice prompt, said acoustic prompt model mathematically representing the words of the outgoing system voice prompt; supplying the input signal to a speech recognizer having an acoustic model of a target vocabulary, said acoustic target vocabulary model mathematically representing at least one user-generated command word; comparing the input signal to the acoustic prompt model and to the acoustic target vocabulary model; determining which of the acoustic prompt model and the acoustic target vocabulary model provides a best match for the input signal during the comparing step; accepting the best match if the acoustic target vocabulary model provides the best match; and ignoring the best match if the acoustic prompt model provides the best match.