The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2001
Filed:
Sep. 14, 1999
Dietrich Klakow, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a method of estimating probabilities of occurrence of speech vocabulary elements in a speech recognition system. By modification of the linguistic speech modeling, further alternatives for reducing the error rate and perplexity of a speech recognition system are proposed. The method according to the invention is characterized in that, in the estimation of a probability of occurrence of a speech vocabulary element, several M-gram probabilities of this element are raised to a higher power by means of an M-gram-specific optimized parameter value, and the powers thus obtained are multiplied by each other, in which the estimation of the probability of occurrence of a speech vocabulary element does not include the case where an M-gram probability with M>1 estimated by means of a first training vocabulary corpus for the speech vocabulary element is multiplied by a quotient raised to a higher power by means of an optimized parameter value, which optimized parameter value is determined by means of the GIS algorithm, and a unigram probability of the element estimated by means of a second training vocabulary corpus serves as a dividend of the quotient, and a unigram probability of the element estimated by means of the first training vocabulary corpus serves as a divisor of the quotient.