Methods and apparatus for multiple source signal separation

a signal separation and multiple source technology, applied in the field of source separation techniques, can solve the problems of unwanted source signals interfering with a desired source signal, unable to use non-linear mixture techniques, and blind approaches to source separation, so as to improve source separation techniques

Active Publication Date: 2007-05-29
NUANCE COMM INC
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented method is that it allows for better separation of sources by combining them into different types of signals before analysis. This can be done through various methods like time division multiplexing or frequency division multiplexing.

Problems solved by technology

The technical problem addressed in this patent is how to efficiently separate sources from mixed sounds using a combination of linear and non-linear mixtures of waves.

Method used

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  • Methods and apparatus for multiple source signal separation
  • Methods and apparatus for multiple source signal separation
  • Methods and apparatus for multiple source signal separation

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Embodiment Construction

[0020]The present invention will be explained below in the context of an illustrative speech recognition application. Further, the illustrative speech recognition application is considered to be “codebook dependent.” It is to be understood that the phrase “codebook dependent” refers to the use of a mixture of Gaussians to model the probability density function of each source signal. The codebook associated to a source signal comprises a collection of codewords characterizing this source signal. Each codeword is specified by its prior probability and by the parameters of a Gaussian distribution: a mean and a covariance matrix. In other words, a mixture of Gaussians is equivalent to a codebook.

[0021]However, it is to be further understood that the present invention is not limited to this or any particular application. Rather, the invention is more generally applicable to any application in which it is desirable to perform a source separation process which does not assume a linear mixing

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Abstract

A technique for separating a signal associated with a first source from a mixture of the first source signal and a signal associated with a second source comprises the following steps/operations. First, two signals respectively representative of two mixtures of the first source signal and the second source signal are obtained. Then, the first source signal is separated from the mixture in a non-linear signal domain using the two mixture signals and at least one known statistical property associated with the first source and the second source, and without a need to use a reference signal.

Description

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Claims

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Application Information

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Owner NUANCE COMM INC
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