Method and apparatus for recognizing spoken words in a speech si

Details Method and apparatus for recognizing spoken words in a speech si Method and apparatus for recognizing spoken words in a speech si

1996-11-19

1999-11-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704245, 704257, G10L 506

Patent

active

059959304

ABSTRACT:
A method and apparatus for processing a sequence of words in a speech signal for speech recognition. The method includes the steps of sampling, at recurrent instants, said speech signal for generating a series of test signals. Signal-by-signal matching and scoring is generated between the test signals and a series of reference signals, where each of the series of reference signals forms one of a plurality of vocabulary words arranged as a vocabulary tree. The vocabulary tree includes a root and a plurality of tree branches wherein any tree branch has a predetermined number of reference signals and is assigned to a speech element and any vocabulary word is assigned to a particular branch junction or branch end. Acoustic recombination determines both continuations of branches and the most probable partial hypotheses within a word because of the use of a vocabulary built up as a tree with branches having reference signals. At least one complete word for a particular test signal is determined, and, separately, for each completed word, there is: I) a word result formed including a word score and an aggregate score, said aggregate score derived from said word score and from a language model value assigned to a combination of said completed word and a uniform-length string of prior completed words.

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Specification for 08/425,304 (Marked "PHD 91,136").

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