Patent ID: 6246980
Filing Date: 2001-06-12
Classification: G10L

Abstract:
Method of speech recognition applying recognition tests to speech segments uttered by a speaker, wherein each recognition test applied to a speech segment provides a list of n sets of parameters memorised in a dictionary of references, n being a number at least equal to one, whereby the sets of said list present maximum likelihoods taking into account the observation of the speech segment, said list being ranked according to decreasing likelihood, the method comprising the steps of:applying the recognition test to a first speech segment uttered by the speaker;examining whether a first optimum set of parameters, obtained at the top of the list of n sets provided by the recognition test applied to the first speech segment, satisfies a criterion of likelihood;if the criterion of likelihood is satisfied by the first optimum set of parameters, selecting the first optimum set of parameters;if the criterion of likelihood is not satisfied by the first optimum set of parameters, requesting the speaker to repeat the speech segment;applying the recognition test to a second speech segment as repeated by the speaker;examining whether a second optimum set of parameters, obtained at the top of the list of n sets provided by the recognition test applied to the second speech segment, satisfies the criterion of likelihood;if the criterion of likelihood is satisfied by the second optimum set of parameters, selecting the second optimum set of parameters;if the criterion of likelihood is not satisfied by the second optimum set of parameters and if a combination of the results of the recognition test applied to the first and second speech segmentssatisfies at least one criterion of combined selection, selecting a set of parameters included in both lists of n sets provided by the recognition test applied to the first and second speech segments,wherein said at least one criterion of combined selection comprises the identity of the first and second optimum sets of parameters.