Patent ID: 6606595
Filing Date: 2003-08-12
Classification: G10L

Abstract:
A method for preventing a false triggering error from an echo of an audible prompt in an interactive automatic speech recognition system which uses a plurality of hidden Markov models of the system's vocabulary with each of the hidden Markov models corresponding to a phrase that is at least one word long, comprising the steps of:building a hidden Markov model of the audible prompt's echo from a plurality of samples of the audible prompt's echo; receiving an input which includes signals that correspond to a caller's speech and an echo of the audible prompt of the interactive automatic speech response system; and using the hidden Markov model of the audible prompt's echo along with the plurality of hidden Markov models of the system's vocabulary in said automatic speech recognition system to recognize said input when an energy of said echo of the audible prompt is at least the same order of magnitude as the energy of the signals that correspond to the caller's speech instead of falsely triggering recognition of one of the plurality of hidden Markov models of the vocabulary.