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:
Apr. 06, 1993
Filed:
May. 22, 1991
Ryuhei Fujiwara, Tokyo, JP;
Keiko Shimada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a speech recognition system, a method for deciding an input pattern as one of reference patterns includes steps for calculating dissimilarities of the input pattern and the reference patterns and selecting a particular one of the dissimilarities which is lower than a threshold value. In order to reduce noise accompanying an input speech pattern in the input pattern, an average noise level is detected from an input pattern before the input speech pattern is detected and a noise factor is produced corresponding to the average noise level. The dissimilarities are multiplied by the noise factor to produce products and then the products are compared with the threshold value to recognize the input speech pattern. According to one aspect of the speech recognition system, particularly the system using the known clockwise DP matching with a beam search technique, the beam width factor is determined as a function of the noise level.