Speech recognition using final decision based on tentative decisions
First Claim
1. A method for making a decision on a speech element in a signal representing an utterance, from among a set of possible speech elements, comprisinggenerating one representation of said utterance based on one range of acoustic frequencies,generating at least one separate representation of said utterance based on a different range of acoustic frequencies,deriving one tentative decision on said speech element from the one representation based on the one range of acoustic frequencies, said one tentative decision being at least one of said speech elements,deriving at least one separate tentative decision on said speech element from the at least one separate acoustic representation based on the different range of acoustic frequencies, said at least one separate tentative decision being at least one of said speech elements, andgenerating a final decision on said speech element from said one tentative decision and said at least one separate tentative decision, said final decision being one of said speech elements.
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Abstract
A method for recognizing speech elements (e.g., phones) in utterances includes the following steps. Based on acoustic frequency, at least two different acoustic representatives are isolated for each of the utterances. From each acoustic representative, tentative decision information on the speech element in the corresponding utterance is derived. A final decision on the speech element in the utterance is then generated, based on the tentative decision information derived from more than one of the acoustic representatives.
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Citations
31 Claims
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1. A method for making a decision on a speech element in a signal representing an utterance, from among a set of possible speech elements, comprising
generating one representation of said utterance based on one range of acoustic frequencies, generating at least one separate representation of said utterance based on a different range of acoustic frequencies, deriving one tentative decision on said speech element from the one representation based on the one range of acoustic frequencies, said one tentative decision being at least one of said speech elements, deriving at least one separate tentative decision on said speech element from the at least one separate acoustic representation based on the different range of acoustic frequencies, said at least one separate tentative decision being at least one of said speech elements, and generating a final decision on said speech element from said one tentative decision and said at least one separate tentative decision, said final decision being one of said speech elements.
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18. An apparatus for making a decision on a speech element in a signal representing an utterance, from among a set of possible speech elements, comprising
a filter for isolating one acoustic representation of said utterance based on one range of acoustic frequencies, at least one additional filter for isolating a separate acoustic representation of said utterance based on a different range of acoustic frequencies, processing channels for deriving one tentative decision on said speech element from said one representation based on the one range of acoustic frequencies, said one tentative decision being at least one of said speech elements, and for deriving at least one separate tentative decision on said speech element from said separate acoustic representation based on the different range of acoustic frequencies, said at least one separate tentative decision being at least one of said speech elements, and a global recognizer connected to and receiving from said processing channels said one tentative decision and said at least one separate tentative decision on said speech element to generate a final decision on said speech element, said final decision being one of said speech elements.
Specification