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:
Jun. 23, 2009
Filed:
Mar. 10, 2004
Zhipeng Zhang, Tokyo, JP;
Kiyotaka Otsuji, Kamakura, JP;
Toshiaki Sugimura, Yokohama, JP;
Sadaoki Furui, Tokyo, JP;
Zhipeng Zhang, Tokyo, JP;
Kiyotaka Otsuji, Kamakura, JP;
Toshiaki Sugimura, Yokohama, JP;
Sadaoki Furui, Tokyo, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Sadaoki Furui, Tokyo, JP;
Abstract
An object of the present invention is to enable optimal clustering for many types of noise data and to improve the accuracy of estimation of a speech model sequence of input speech. Noise is added to speech in accordance with noise-to-signal ratio conditions to generate noise-added speech (step S), the mean value of speech cepstral is subtracted from the generated, noise-added speech (step), a Gaussian distribution model of each piece of noise-added speech is created (step S), the likelihoods of the pieces of noise-added speech are calculated to generate a likelihood matrix (step S) to obtain a clustering result. An optimum model is selected (step S) and linear transformation is performed to provide a maximized likelihood (step S). Because noise-added speech is consistently used both in clustering and model learning, clustering for many types of noise data and an accurate estimation of a speech model sequence can be achieved.