Apparatus and method for determining a likely word sequence...

Details Apparatus and method for determining a likely word sequence... Apparatus and method for determining a likely word sequence...

G - Physics

06

F

354/47

G06F 5/00 (2006.01) G10L 15/14 (2006.01)

Patent

CA 1248633

APPARATUS AND METHOD FOR DETERMINING A LIKELY WORD SEQUENCE FROM LABELS GENERATED BY AN AN ACOUSTIC PROCESSOR ABSTRACT OF THE DISCLOSURE The present invention addresses the problem of deter- mining, in a speech recognition context, a likely se- quence or path of words from a plurality of word paths given a string of labels that are generated at succes- sive intervals. The invention features multiple stack decoding and a unique strategy for extending one word path at a time without undue reliance on word path length. With multiple stack decoding, a stack is asso- ciated with each label of the label string. Word paths that most likely end at a given label are assigned to the stack corresponding to the given label and are or- dered according to likelihood at the given label. The strategy of deciding which word path to extend includes the forming of a likelihood envelope against which the word paths are compared to determine if a word path is sufficiently likely to be extended. From among the word paths that are found to be extendible, the word path of highest likelihood in the earliest stack --i.e. the shortest most likely word path-- is selected for exten- sion. After a word path is extended, it is deleted from its stack and the word paths extended therefrom are en- tered into appropriate stacks.

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