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Voice conversion method of united frequency-spectrum modeling based on restricted boltzman machine

A technology of Boltzmann machine and joint spectrum, which is applied in speech synthesis, speech analysis, speech recognition, etc., and can solve problems such as over-smoothing

Active Publication Date: 2013-11-27
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0008] The technical solution of the present invention: In order to improve the over-smoothing problem in the existing sound conversion method, a sound conversion method based on joint spectral modeling of restricted Boltzmann machines is provided, which improves the accuracy of spectral modeling and improves the conversion of speech Sound quality and naturalness

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  • Voice conversion method of united frequency-spectrum modeling based on restricted boltzman machine

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[0112] In the present invention, according to the idea of ​​joint spectrum modeling based on restricted Boltzmann machine, the specific process of realizing sound conversion is obtained as follows: figure 1 shown. Different from using a single Gaussian to describe each acoustic subspace in the GMM-based model conversion method, the present invention uses a restricted Boltzmann machine (RBM) model for description. In the RBM training module, RBMs with different structures can be used according to the specific form of the RBM model, such as Gaussian-Bernoulli RBM, Gaussian-Gaussian RBM, etc.

[0113] Restricted Boltzmann machine (see R.Salakhutdinov, "Learning deep generative models," Ph.D. dissertation, University of Toronto, 2009.) is a machine with An undirected graph model of a two-layer structure, which consists of a set of visible random variables v=[v 1 , v 2 ,...,v V ] T Nodes and a set of hidden random variables h=[h 1 , h 2 ,...,h H ] T Nodes, V and H are the ...

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Abstract

Disclosed is a voice conversion method of united frequency-spectrum modeling based on a restricted boltzman machine. The method comprises the implementation steps: extracting voice spectrum envelope characteristics, extracting voice high-layer spectrum characteristics, conducting dynamic time warping, training a GMM, dividing acoustic subspaces of the united spectrum envelope characteristics, training a Gaussian-Bernouslli RBM or a Gaussian-Gaussian RBM, converting frequency spectrums and synthesizing conversion voices. According to the voice conversion method of the united frequency-spectrum modeling based on the restricted boltzman machine, the precision of the frequency-spectrum modeling is improved, and the tone quality and the naturalness of the conversion voices are improved.

Description

technical field [0001] The invention relates to a sound conversion method in speech synthesis, in particular to a sound conversion method based on joint spectrum modeling of a restricted Boltzmann machine (Restricted Boltzmann Machine, RBM). Background technique [0002] The purpose of voice conversion (also known as speaker conversion) is to transform the speech of one speaker (source speaker) to make it sound like another speaker (target speaker) while keeping the semantics of the speech unchanged. Currently, joint spectrum modeling based on Gaussian Mixture Model (GMM) (see Y. Stylianou, O. Cappé, and E. Moulines, "Continuous probabilistic transform for voice conversion," IEEE Trans. Speech Audio Process., vol.6, no.2, pp.131-142, Mar.1998.) is the mainstream method for voice conversion. The main principle of this method is to use multiple Gaussian distributions to fit the joint spectral feature probability distribution of the source and target according to the maximum l...

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Application Information

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IPC IPC(8): G10L13/033G10L15/06
Inventor 刘利娟陈凌辉凌震华戴礼荣
Owner UNIV OF SCI & TECH OF CHINA
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